{
  "id": "x402",
  "name": "x402",
  "category": "protocols",
  "summary": "Open standard for internet-native payments built on HTTP 402, letting APIs and agents pay per request across crypto and fiat networks.",
  "description": "Server middleware declares prices per route; clients pay and retry inside the HTTP request flow, with no accounts or checkout pages. Reference SDKs exist for TypeScript (`@x402/*`), Python (`pip install x402`) and Go. The canonical repo is x402-foundation/x402 (coinbase/x402 is now a fork).",
  "url": "https://x402.org",
  "repo": "https://github.com/x402-foundation/x402",
  "docs": "https://docs.x402.org",
  "tags": [
    "payments",
    "http-402",
    "stablecoins",
    "micropayments",
    "open-standard"
  ],
  "license": "Apache-2.0",
  "pricing": "open-source",
  "status": "active",
  "agent_access": {
    "llms_txt": "https://docs.x402.org/llms.txt",
    "auth": "none"
  },
  "related": [
    "cdp-x402",
    "machine-payments-protocol",
    "l402",
    "coinbase-agentic-wallet"
  ],
  "sources": [
    "https://x402.org",
    "https://github.com/x402-foundation/x402",
    "https://docs.x402.org"
  ],
  "added": "2026-10-02",
  "updated": "2026-10-02",
  "last_verified": "2026-10-02",
  "submitted_by": "agentica-curator",
  "maintainer": "x402 Foundation",
  "longform": [
    {
      "type": "guide",
      "id": "pay-for-an-api-with-x402",
      "title": "Pay for an API as an agent with x402",
      "url": "https://indexagentica.com/guides/pay-for-an-api-with-x402/",
      "json": "https://indexagentica.com/api/longform/guides/pay-for-an-api-with-x402.json"
    },
    {
      "type": "comparison",
      "id": "agent-payment-rails",
      "title": "Agent payment protocols compared",
      "url": "https://indexagentica.com/compare/agent-payment-rails/",
      "json": "https://indexagentica.com/api/longform/compare/agent-payment-rails.json"
    },
    {
      "type": "stack",
      "id": "agent-that-can-buy-things",
      "title": "Agent that can buy things",
      "url": "https://indexagentica.com/stacks/agent-that-can-buy-things/",
      "json": "https://indexagentica.com/api/longform/stacks/agent-that-can-buy-things.json"
    },
    {
      "type": "skill",
      "id": "pay-with-x402",
      "title": "Pay with x402",
      "url": "https://indexagentica.com/skills/pay-with-x402/",
      "json": "https://indexagentica.com/api/longform/skills/pay-with-x402.json"
    }
  ],
  "links": {
    "html": "https://indexagentica.com/entries/x402/",
    "markdown": "https://indexagentica.com/entries/x402.md",
    "json": "https://indexagentica.com/api/entries/x402.json",
    "source": "https://github.com/Drudley/indexagentica/blob/main/content/protocols/x402.json"
  }
}