{
  "markdown": "# x402 GPT API | GPT-5.6 Luna Base USDC Gateway\n\nGPT55 x402 Gateway is the canonical buyer-owned Base USDC entry for this repository.\n\nGPT55 is an **x402 GPT API** gateway: it provides an OpenAI-compatible\n**GPT-5.6 Luna Standard** result for **$0.00293 USDC on Base**. This is a\ncompatible gateway, not an OpenAI-operated product. Buyers can pay one\nrequest from a browser wallet without handing over a private key, or use the\nquote-first agent fallback client when a wallet UI is unavailable.\n\nThe focused search topic is **x402 GPT API / GPT API with USDC on Base**:\none `POST` request, one live quote, and one response. The canonical buyer path\nand complete integration guide are below.\n\nThe EVM Wallet Balance Snapshot remains available as a separate utility\nalternative; it is not the model product.\n\nCanonical service entry:\n\n- Service hub: <https://gpt55.558686.xyz/x402/service>\n- Machine-readable catalog: <https://gpt55.558686.xyz/x402/service.json>\n- x402 GPT API guide: <https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api>\n- Static buyer guide: <https://wangletiand.github.io/gpt55-x402-gateway/x402-gpt-api-guide.html>\n- Machine-readable summary: <https://wangletiand.github.io/gpt55-x402-gateway/llms.txt>\n- Main model route: `POST https://gpt55.558686.xyz/v1/chat/completions/standard`\n- Standard quote: `$0.00293` (`2930` atomic USDC units) on Base `eip155:8453`\n- Browser checkout: <https://gpt55.558686.xyz/x402/service?checkout=standard-chat>\n- Wallet alternative: <https://gpt55.558686.xyz/x402/service?checkout=evm-wallet-balance>\n- Key Pack upgrade: <https://x402-key.558686.xyz/x402/checkout>\n- MCP endpoint: <https://gpt55.558686.xyz/mcp>\n\nFor the exact browser-wallet, Base MCP, agent fallback, receipt, and directory\nverification sequence, see [docs/demand-first-checkout.md](docs/demand-first-checkout.md).\n\n## Lowest-Friction First Payment\n\nWhen validating a buyer-owned wallet or x402 client, start with the deterministic\ntranslate settlement canary before buying a model call or a larger pack:\n\n- Buyer guide: <https://gpt55.558686.xyz/x402/translate-first-purchase>\n- Paid route: `POST https://gpt55.558686.xyz/v1/tools/translate`\n- Quote-only command: `ROUTE_ID=translate-canary MAX_USDC=0.00293 node first-payment-client.mjs`\n\nThe client is quote-only by default. It verifies the live amount, Base network,\nUSDC asset, merchant address, and same-request retry contract before an operator\nexplicitly opts into payment. A successful canary is the smallest real payment\ntest; Standard chat is the next step for a useful GPT-5.6 Luna response.\n\n## Agent Fallback\n\nThe buyer client is quote-only by default. Its local policies pin the exact URL,\nHTTP method, amount, Base network, canonical Base USDC contract, and merchant\naddress for both Wallet and Standard. Remote catalogs are discovery metadata only.\nThe client does not sign or pay unless the operator explicitly sets\n`PAY_REAL_X402=1` and provides a wallet key in the operator-controlled process.\n\nNever paste a private key, seed phrase, payment header, API key, or exchange\ncredential into a website, chat, issue, log, or remote service.\n\n## Quote-Only Check\n\n```bash\ngit clone https://github.com/wangletiand/gpt55-x402-gateway.git\ncd gpt55-x402-gateway\nnpm install\nROUTE_ID=standard MAX_USDC=0.00293 npm run first-payment:quote\n```\n\nThe command remains quote-only unless real payment is explicitly enabled.\nGenerated evidence files and `.env` files are ignored by Git.\n\nThe live quote is authoritative immediately before any payment. For an\nOpenAI-compatible request, send the same JSON body to\n`/v1/chat/completions/standard` after the x402 client returns a valid paid\nretry. The public service hub includes the browser-wallet flow and a link to\nthe agent fallback client.\n\n## Local MCP Wrapper\n\n```bash\nnpm install\nnpm test\nnpm start\n```\n\nThe wrapper exposes one local read-only directory tool. It does not proxy MCP\ntool calls, custody funds, store wallet keys, or execute payments.\n\n## Repository Scope\n\nThis public repository intentionally contains only the maintained runtime\nwrapper, buyer safety client, tests, and concise documentation. Operational\nlogs, payment evidence, wallet files, credentials, internal channel ledgers,\nand bulk submission automation are excluded.\n\n## Support and Security\n\nFor security reports, follow [SECURITY.md](SECURITY.md). Do not include secrets\nor wallet material in a report.\n\nLicensed under the MIT License.\n",
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  "repo_slug": "wangletiand/gpt55-x402-gateway",
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  "api": "https://agentalog.com/api/listings/mcp_xyz_558686_gpt55_token_gateway_570e9142/readme"
}