x402 Dev Tools

Every x402 tool you need to build and test a client: radius-cli and the chain-agnostic pay script, Postman/Insomnia/OpenAPI collections, an MCP server, and a live catalog of 93 testnet endpoints.

Command-line clients

• radius-cli — the reference x402 client for the Radius testnet
• node scripts/pay.ts — a chain-agnostic viem-based pay script for any registered chain

Importable API collections

• Postman collection
• Insomnia export
• OpenAPI 3.1

MCP server for agents

Add grug402 as a remote MCP tool server so your agent can browse and call x402 scenarios directly. See Agent Readiness.

Browse the full catalog