An IT team sells an API or tool call
Trace a paid request across the app runtime, cloud identity, edge policy, payment verifier and settlement network.
Evidence, not endorsement
A research and planning tool, not a vendor certification. Sources describe specific products, not every service offered by a company. Unknown means not established by the sources reviewed, not unsupported. grug402 sandbox tests do not test these vendors. Operational owners are suggested team contacts, not legal liability assignments.
Editorial review: 2026-10-08. Evidence older than 90 days needs rechecking; source check dates are not release dates.
Illustrative participants, not integrations
The sequence below is a hypothetical role walkthrough. Named examples do not imply a working connection.
Discovery
Publish a usable API/tool contract and a clear price. A Railway or val.town deployment can be an application role; that alone does not provide payments.
Suggested operational owner: API product and application engineering.
Authorization
Separate API identity from permission to spend. Bind the amount, asset, recipient and resource to the user's intended action.
Suggested operational owner: Identity/security and agent engineering.
Payment
An x402 or MPP integration challenges the client, verifies its credential and settles through a chosen provider. Cloudflare documents SDK support; other selected hosts still need their own integration review.
Suggested operational owner: Payments engineering and facilitator operator.
Delivery
Serve the purchased result with a receipt. Set cache, WAF and timeout rules for the payment exchange through your actual edge deployment.
Suggested operational owner: Application, CDN and platform engineering.
Failure & recovery
Test blocked retries, cache leaks and ambiguous timeouts. Reconcile settlement before another attempt and retain enough audit context without exposing secrets.
Suggested operational owner: Site reliability and payments operations.
Relevant sandbox tests — not vendor results
These are controlled grug402 scenarios. A passing sandbox request does not certify a company, integration, checkout or refund process.
- P1: A payment that completes — Establish a baseline before diagnosing failure cases. Suggested owner: Payments engineering.
- P1: Bind approval to the right service — A payment must not be redirected to an unexpected resource host. Suggested owner: Agent product and security.
- P1: Handle paid-but-not-delivered — Settlement can succeed while the application fails to deliver. Suggested owner: Payments and customer operations.
- P1: Establish safe edge behavior — Challenges and personalized paid responses need deliberate cache controls. Suggested owner: CDN and application engineering.
- P2: Avoid stale payment instructions — A cached challenge can advertise an expired quote or outdated payment terms. Suggested owner: CDN and payments engineering.
- P1: Prevent paid content leaking from cache — A shared cache can serve one payer's content to another visitor. Suggested owner: CDN and security.
- P2: Allow valid payment credentials through — Security policy may reject a legitimate payment retry. Suggested owner: Network and security.
- P2: Coordinate edge and settlement timeouts — A timeout can leave the buyer unsure whether the service was paid. Suggested owner: Network and payments operations.
Coverage limits
Sandbox scenarios model failure classes, not a production CDN, host, wallet or facilitator certification. MPP coverage and network support vary; consult each scenario.