{
  "protocol_version": "2026-04-08",
  "spec": "https://ucp.dev/2026-04-08/specification/overview/",
  "builtBy": {
    "name": "Radius",
    "url": "https://radiustech.xyz",
    "context": "Built for Radius workshop",
    "tagline": "Stablecoin-native settlement infrastructure for the agentic internet",
    "description": "Radius is stablecoin-native settlement infrastructure for the agentic internet, settling machine-to-machine micropayments at the scale of API calls, paid content, and streaming compute — with sub-second finality, near-zero transaction costs, EVM-compatible execution, stablecoin fees, and no native token. Radius provides first-party x402 facilitator infrastructure (Permit2 settlement, EIP-2612 gas sponsoring) for HTTP 402 payments on Radius mainnet and testnet."
  },
  "services": {
    "dev.ucp.shopping": [
      {
        "version": "2026-04-08",
        "spec": "https://ucp.dev/2026-04-08/specification/overview/",
        "transport": "rest",
        "endpoint": "http://127.0.0.1:8080/api/x402",
        "schema": "https://grug402.dev/.well-known/ucp/schemas/x402.service.json"
      }
    ]
  },
  "capabilities": {
    "dev.ucp.shopping.checkout": [
      {
        "version": "2026-04-08",
        "spec": "https://ucp.dev/2026-04-08/specification/checkout/",
        "schema": "https://grug402.dev/.well-known/ucp/schemas/x402.checkout.json"
      }
    ]
  },
  "payment_handlers": {},
  "endpoints": [
    {
      "id": "compliant-get",
      "name": "Canonical GET (real verify and settle)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/compliant-get",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/compliant-get.md"
    },
    {
      "id": "compliant-post",
      "name": "Canonical POST with body",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/compliant-post",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/compliant-post.md"
    },
    {
      "id": "compliant-body-get",
      "name": "Body-primary GET challenge",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/compliant-body-get",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/compliant-body-get.md"
    },
    {
      "id": "compliant-body-post",
      "name": "Body-primary POST challenge",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/compliant-body-post",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/compliant-body-post.md"
    },
    {
      "id": "cheapest",
      "name": "Minimal price (1 atomic unit)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/cheapest",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "1",
        "sbc": "0.000001"
      },
      "documentation": "https://grug402.dev/scenario/cheapest.md"
    },
    {
      "id": "multi-accepts",
      "name": "Single testnet accepts entry",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/multi-accepts",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/multi-accepts.md"
    },
    {
      "id": "idempotent-retry",
      "name": "Correct idempotency (cached retry)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/idempotent-retry",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/idempotent-retry.md"
    },
    {
      "id": "weather-now",
      "name": "Weather API (pay-per-call)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/weather-now",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/weather-now.md"
    },
    {
      "id": "fx-rate",
      "name": "FX rate API (pay-per-call)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/fx-rate",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/fx-rate.md"
    },
    {
      "id": "haiku-generator",
      "name": "Haiku generator (POST, paid)",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/haiku-generator",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/haiku-generator.md"
    },
    {
      "id": "status-401",
      "name": "Returns 401 instead of 402",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/status-401",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/status-401.md"
    },
    {
      "id": "status-403",
      "name": "Returns 403 instead of 402",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/status-403",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/status-403.md"
    },
    {
      "id": "status-400",
      "name": "Returns 400 instead of 402",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/status-400",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/status-400.md"
    },
    {
      "id": "status-200-leak",
      "name": "Returns 200 with content (no gate)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/status-200-leak",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/status-200-leak.md"
    },
    {
      "id": "missing-payment-required",
      "name": "402 without PAYMENT-REQUIRED header",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/missing-payment-required",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/missing-payment-required.md"
    },
    {
      "id": "header-raw-json",
      "name": "PAYMENT-REQUIRED is raw JSON (not base64)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/header-raw-json",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/header-raw-json.md"
    },
    {
      "id": "header-bad-base64",
      "name": "PAYMENT-REQUIRED is invalid base64",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/header-bad-base64",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/header-bad-base64.md"
    },
    {
      "id": "header-base64-not-json",
      "name": "Base64 decodes to non-JSON",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/header-base64-not-json",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/header-base64-not-json.md"
    },
    {
      "id": "amount-as-number",
      "name": "Atomic amount as a JSON number",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/amount-as-number",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/amount-as-number.md"
    },
    {
      "id": "missing-x402-version",
      "name": "Missing x402Version",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/missing-x402-version",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/missing-x402-version.md"
    },
    {
      "id": "legacy-v1-headers",
      "name": "Legacy v1 headers (X-PAYMENT)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/legacy-v1-headers",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/legacy-v1-headers.md"
    },
    {
      "id": "empty-accepts",
      "name": "Empty accepts array",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/empty-accepts",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/empty-accepts.md"
    },
    {
      "id": "unsupported-scheme",
      "name": "Unsupported payment scheme",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/unsupported-scheme",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/unsupported-scheme.md"
    },
    {
      "id": "wrong-network-mainnet",
      "name": "Advertises mainnet, settles on testnet",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/wrong-network-mainnet",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/wrong-network-mainnet.md"
    },
    {
      "id": "wrong-token",
      "name": "Wrong token contract address",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/wrong-token",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/wrong-token.md"
    },
    {
      "id": "wrong-decimals",
      "name": "Wrong decimals (18 instead of 6)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/wrong-decimals",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/wrong-decimals.md"
    },
    {
      "id": "wrong-payto",
      "name": "Wrong payTo address",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/wrong-payto",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/wrong-payto.md"
    },
    {
      "id": "missing-resource",
      "name": "Missing resource URL",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/missing-resource",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/missing-resource.md"
    },
    {
      "id": "expired-quote",
      "name": "Already-expired quote (timeout 0)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/expired-quote",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/expired-quote.md"
    },
    {
      "id": "overlong-validity",
      "name": "Overlong validity window (1 year)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/overlong-validity",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/overlong-validity.md"
    },
    {
      "id": "changing-price",
      "name": "Price changes every request",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/changing-price",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/changing-price.md"
    },
    {
      "id": "dollar-string-price",
      "name": "Dollar-string price ($0.0001)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/dollar-string-price",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/dollar-string-price.md"
    },
    {
      "id": "sensitive-metadata",
      "name": "Sensitive data in metadata",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/sensitive-metadata",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/sensitive-metadata.md"
    },
    {
      "id": "skip-verify",
      "name": "Skips /verify, settles directly",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/skip-verify",
      "category": "Verification Gaps",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/skip-verify.md"
    },
    {
      "id": "verify-only-no-settle",
      "name": "Grants on /verify, never settles",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/verify-only-no-settle",
      "category": "Verification Gaps",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/verify-only-no-settle.md"
    },
    {
      "id": "no-facilitator-check",
      "name": "No verification at all",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/no-facilitator-check",
      "category": "Verification Gaps",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/no-facilitator-check.md"
    },
    {
      "id": "trust-client-response",
      "name": "Trusts client-supplied result",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/trust-client-response",
      "category": "Verification Gaps",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/trust-client-response.md"
    },
    {
      "id": "fail-open-timeout",
      "name": "Fails open when the facilitator is down",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/fail-open-timeout",
      "category": "Verification Gaps",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/fail-open-timeout.md"
    },
    {
      "id": "replay-after-success",
      "name": "Replay after success (no binding)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/replay-after-success",
      "category": "Replay / Idempotency / Race",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/replay-after-success.md"
    },
    {
      "id": "serve-before-settle",
      "name": "Serves before settlement (verify/settle gap)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/serve-before-settle",
      "category": "Replay / Idempotency / Race",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/serve-before-settle.md"
    },
    {
      "id": "cors-hides-headers",
      "name": "CORS hides payment headers",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/cors-hides-headers",
      "category": "Web / HTTP Layer",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/cors-hides-headers.md"
    },
    {
      "id": "head-leak",
      "name": "HEAD reveals paid metadata",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/head-leak",
      "category": "Web / HTTP Layer",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/head-leak.md"
    },
    {
      "id": "upto-correct",
      "name": "upto: settles actual usage",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/upto-correct",
      "category": "Schemes (exact / upto / batch)",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/upto-correct.md"
    },
    {
      "id": "upto-charges-max",
      "name": "upto: always charges the max",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/upto-charges-max",
      "category": "Schemes (exact / upto / batch)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/upto-charges-max.md"
    },
    {
      "id": "upto-override-exceeds-max",
      "name": "upto: override exceeds the max",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/upto-override-exceeds-max",
      "category": "Schemes (exact / upto / batch)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/upto-override-exceeds-max.md"
    },
    {
      "id": "upto-zero-free",
      "name": "upto: settles zero (free)",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/upto-zero-free",
      "category": "Schemes (exact / upto / batch)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/upto-zero-free.md"
    },
    {
      "id": "dead-facilitator",
      "name": "Dead facilitator URL",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/dead-facilitator",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/dead-facilitator.md"
    },
    {
      "id": "unsupported-network-facilitator",
      "name": "Facilitator can't support the network",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/unsupported-network-facilitator",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/unsupported-network-facilitator.md"
    },
    {
      "id": "facilitator-rate-limited",
      "name": "Facilitator rate-limits /verify (429 → misclassified 402)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-rate-limited",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-rate-limited.md"
    },
    {
      "id": "facilitator-soft-down-503",
      "name": "Facilitator temporarily unavailable (503)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-soft-down-503",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-soft-down-503.md"
    },
    {
      "id": "facilitator-settle-500",
      "name": "Settle returns 500 (ambiguous paid state)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-settle-500",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-settle-500.md"
    },
    {
      "id": "facilitator-missing-txhash",
      "name": "Settle succeeds without txHash",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-missing-txhash",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-missing-txhash.md"
    },
    {
      "id": "facilitator-non-json-leaks",
      "name": "Non-JSON facilitator response leaked in 402",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-non-json-leaks",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-non-json-leaks.md"
    },
    {
      "id": "facilitator-schema-drift",
      "name": "Schema drift: valid vs isValid (loose check grants)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-schema-drift",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-schema-drift.md"
    },
    {
      "id": "facilitator-no-verify-timeout",
      "name": "No timeout on /verify (hangs indefinitely)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-no-verify-timeout",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-no-verify-timeout.md"
    },
    {
      "id": "facilitator-wrong-payto-at-settle",
      "name": "Wrong payTo used at settle time",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-wrong-payto-at-settle",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-wrong-payto-at-settle.md"
    },
    {
      "id": "facilitator-already-settled-grants",
      "name": "Grants access despite settle failure",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-already-settled-grants",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-already-settled-grants.md"
    },
    {
      "id": "facilitator-settle-concurrent-race",
      "name": "Concurrent settle race (second racer gets 402)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/facilitator-settle-concurrent-race",
      "category": "Facilitator Dependency",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/facilitator-settle-concurrent-race.md"
    },
    {
      "id": "settle-then-fail",
      "name": "Settles, then the handler fails",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/settle-then-fail",
      "category": "Paid-but-Denied / Unpaid-Service",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/settle-then-fail.md"
    },
    {
      "id": "missing-payment-response",
      "name": "Success without PAYMENT-RESPONSE",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/missing-payment-response",
      "category": "Paid-but-Denied / Unpaid-Service",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/missing-payment-response.md"
    },
    {
      "id": "joke-api",
      "name": "Joke API (pay-per-call)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/joke-api",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/joke-api.md"
    },
    {
      "id": "dictionary-api",
      "name": "Dictionary API (pay-per-call)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/dictionary-api",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/dictionary-api.md"
    },
    {
      "id": "quote-api",
      "name": "Quote API (pay-per-call)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/quote-api",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/quote-api.md"
    },
    {
      "id": "wrong-transfer-method",
      "name": "Wrong asset transfer method",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/wrong-transfer-method",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/wrong-transfer-method.md"
    },
    {
      "id": "zero-price-gated",
      "name": "Advertises a zero price but still gates",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/zero-price-gated",
      "category": "402 / Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "0",
        "sbc": "0"
      },
      "documentation": "https://grug402.dev/scenario/zero-price-gated.md"
    },
    {
      "id": "batch-settlement-correct",
      "name": "batch-settlement: deposit, then reconcile usage",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/batch-settlement-correct",
      "category": "Schemes (exact / upto / batch)",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/batch-settlement-correct.md"
    },
    {
      "id": "batch-settlement-overcharge-deposit",
      "name": "batch-settlement: settles beyond the deposit",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/batch-settlement-overcharge-deposit",
      "category": "Schemes (exact / upto / batch)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/batch-settlement-overcharge-deposit.md"
    },
    {
      "id": "batch-settlement-never-reconciles",
      "name": "batch-settlement: never reconciles down",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/batch-settlement-never-reconciles",
      "category": "Schemes (exact / upto / batch)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/batch-settlement-never-reconciles.md"
    },
    {
      "id": "client-scheme-mismatch",
      "name": "exact: canonical scheme identifier (client sends the wrong one)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/client-scheme-mismatch",
      "category": "Schemes (exact / upto / batch)",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/client-scheme-mismatch.md"
    },
    {
      "id": "multi-network-accepts",
      "name": "Genuine multi-entry accepts (match by network)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/multi-network-accepts",
      "category": "Multi-Network Selection (MCP)",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/multi-network-accepts.md"
    },
    {
      "id": "svm-requirement",
      "name": "SVM-only requirement (solana:*)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/svm-requirement",
      "category": "Multi-Network Selection (MCP)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/svm-requirement.md"
    },
    {
      "id": "cross-vm-accepts",
      "name": "Cross-VM accepts (EVM and SVM together)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/cross-vm-accepts",
      "category": "Multi-Network Selection (MCP)",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/cross-vm-accepts.md"
    },
    {
      "id": "overpriced-vs-cap",
      "name": "Overpriced vs per-call cap",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/overpriced-vs-cap",
      "category": "Client Policy Gate (MCP)",
      "compliant": false,
      "price": {
        "atomic": "1000000",
        "sbc": "1"
      },
      "documentation": "https://grug402.dev/scenario/overpriced-vs-cap.md"
    },
    {
      "id": "resource-host-mismatch",
      "name": "Resource host mismatch",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/resource-host-mismatch",
      "category": "Client Policy Gate (MCP)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/resource-host-mismatch.md"
    },
    {
      "id": "tool-operation-mismatch",
      "name": "Tool / operation mismatch",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/tool-operation-mismatch",
      "category": "Client Policy Gate (MCP)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/tool-operation-mismatch.md"
    },
    {
      "id": "session-price-escalation",
      "name": "Session price escalation",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/session-price-escalation",
      "category": "Client Policy Gate (MCP)",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/session-price-escalation.md"
    },
    {
      "id": "edge-correct-headers",
      "name": "Correct edge cache headers (compliant)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-correct-headers",
      "category": "Edge / CDN Controls",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-correct-headers.md"
    },
    {
      "id": "edge-cacheable-challenge",
      "name": "Cacheable 402 challenge",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-cacheable-challenge",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-cacheable-challenge.md"
    },
    {
      "id": "edge-cacheable-paid",
      "name": "Cacheable paid response (shared cache)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-cacheable-paid",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-cacheable-paid.md"
    },
    {
      "id": "edge-missing-vary",
      "name": "Missing Vary on payment",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-missing-vary",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-missing-vary.md"
    },
    {
      "id": "edge-swr-leak",
      "name": "stale-while-revalidate leak",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-swr-leak",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-swr-leak.md"
    },
    {
      "id": "edge-oversized-header",
      "name": "Oversized challenge header",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-oversized-header",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-oversized-header.md"
    },
    {
      "id": "edge-conditional-304",
      "name": "Conditional 304 replay",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-conditional-304",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-conditional-304.md"
    },
    {
      "id": "edge-rate-limited",
      "name": "Rate-limited before payment",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-rate-limited",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-rate-limited.md"
    },
    {
      "id": "edge-waf-blocks-payment",
      "name": "WAF blocks the payment payload",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-waf-blocks-payment",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-waf-blocks-payment.md"
    },
    {
      "id": "edge-body-too-large",
      "name": "Body too large (413)",
      "method": "POST",
      "url": "http://127.0.0.1:8080/api/x402/edge-body-too-large",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-body-too-large.md"
    },
    {
      "id": "edge-timeout-settle",
      "name": "Edge timeout during settle",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/x402/edge-timeout-settle",
      "category": "Edge / CDN Controls",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/edge-timeout-settle.md"
    },
    {
      "id": "mpp-push-happy",
      "name": "MPP push happy path (EIP-3009)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-push-happy",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-push-happy.md"
    },
    {
      "id": "mpp-permit-happy",
      "name": "MPP permit happy path (EIP-2612)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-permit-happy",
      "category": "Happy Path",
      "compliant": true,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-permit-happy.md"
    },
    {
      "id": "mpp-wrong-status",
      "name": "MPP challenge returns 401 instead of 402",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-wrong-status",
      "category": "Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-wrong-status.md"
    },
    {
      "id": "mpp-missing-authenticate",
      "name": "MPP 402 without WWW-Authenticate",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-missing-authenticate",
      "category": "Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-missing-authenticate.md"
    },
    {
      "id": "mpp-raw-json-authenticate",
      "name": "WWW-Authenticate challenge is raw JSON (not Payment scheme)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-raw-json-authenticate",
      "category": "Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-raw-json-authenticate.md"
    },
    {
      "id": "mpp-bearer-authenticate",
      "name": "WWW-Authenticate uses Bearer instead of Payment scheme",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-bearer-authenticate",
      "category": "Challenge Construction",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-bearer-authenticate.md"
    },
    {
      "id": "mpp-bad-credential",
      "name": "MPP server rejects every credential",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-bad-credential",
      "category": "Credential Validation",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-bad-credential.md"
    },
    {
      "id": "mpp-skip-validation",
      "name": "MPP grants on credential presence (no validation)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-skip-validation",
      "category": "Credential Validation",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-skip-validation.md"
    },
    {
      "id": "mpp-paid-denied",
      "name": "MPP paid-but-denied (403 after valid credential)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-paid-denied",
      "category": "Paid-but-Denied",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-paid-denied.md"
    },
    {
      "id": "mpp-replay-accepted",
      "name": "MPP replay accepted (no idempotency check)",
      "method": "GET",
      "url": "http://127.0.0.1:8080/api/mpp/mpp-replay-accepted",
      "category": "Credential Validation",
      "compliant": false,
      "price": {
        "atomic": "100",
        "sbc": "0.0001"
      },
      "documentation": "https://grug402.dev/scenario/mpp-replay-accepted.md"
    }
  ],
  "payment": {
    "protocol": "x402",
    "network": "eip155:72344",
    "chainId": 72344,
    "asset": {
      "symbol": "SBC",
      "address": "0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb",
      "decimals": 6
    },
    "facilitator": "https://facilitator.testnet.radiustech.xyz",
    "payTo": "0x05354779F8E5397624928a461b97b190CAFcc23B"
  },
  "discovery": {
    "self": "https://grug402.dev/.well-known/ucp",
    "apiCatalog": "https://grug402.dev/.well-known/api-catalog",
    "agentSkills": "https://grug402.dev/.well-known/agent-skills",
    "openapi": "https://grug402.dev/openapi.yaml",
    "llms": "https://grug402.dev/llms.txt",
    "catalog": "http://127.0.0.1:8080/api/x402/catalog"
  },
  "ucp": {
    "version": "2026-04-08",
    "services": {
      "dev.ucp.shopping": [
        {
          "version": "2026-04-08",
          "spec": "https://ucp.dev/2026-04-08/specification/overview/",
          "transport": "rest",
          "endpoint": "http://127.0.0.1:8080/api/x402",
          "schema": "https://grug402.dev/.well-known/ucp/schemas/x402.service.json"
        }
      ]
    },
    "capabilities": {
      "dev.ucp.shopping.checkout": [
        {
          "version": "2026-04-08",
          "spec": "https://ucp.dev/2026-04-08/specification/checkout/",
          "schema": "https://grug402.dev/.well-known/ucp/schemas/x402.checkout.json"
        }
      ]
    },
    "payment_handlers": {}
  }
}