{
  "name": "send21",
  "description": "Non-custodial crypto payment drafts and checkout pay links for BTC, USDC, USDT, and EURC. Tools for creating drafts, payment requests, transaction templates, rates, and fees. send21 never holds keys or funds.",
  "endpoint": "https://send21.io/mcp",
  "transport": "streamable-http",
  "authentication": {
    "type": "bearer",
    "description": "Authorization: Bearer s21_<api key>. Scoped API keys are created by the account owner at https://send21.io/api-keys. tools/list works unauthenticated."
  },
  "documentation": "https://send21.io/llms.txt",
  "openapi": "https://send21.io/swagger/v1/swagger.json",
  "contact": "integration@send21.io"
}