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x402 Dev Tools – Discovery Document Generator
x402
x402 Dev Tools – Discovery Document Generator is a paid API for AI agents from dev.kagurazaka.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Generates OpenAPI 3.1, /.well-known/x402, and llms.txt discovery documents for a list of paid x402 API endpoints
Price / call$0.003
Success—
StatusUnknown
How this service works
Generates the discovery documents directories and agents read for a list of paid endpoints (up to 100): an OpenAPI 3.1 document with x-payment-info prices and examples, the /.well-known/x402 resource list and an llms.txt, in the shape x402scan and the CDP Bazaar index.
Output
Returns a JSON object containing three discovery artifacts: (1) a complete OpenAPI 3.1 document with x-payment-info extensions listing prices and examples for each endpoint, (2) a /.well-known/x402 JSON resource list with versioned endpoint URLs, and (3) an llms.txt file in the format expected by x402scan and the CDP Bazaar agent index.
Example use cases
Bootstrapping a new paid API's discoverability
“I just launched a paid API at https://api.myfinance.dev — it has two POST endpoints: /v1/quote at $0.002 and /v1/portfolio at $0.005. Can you generate the OpenAPI 3.1 doc with x402 payment extensions, the /.well-known/x402 file, and an llms.txt so x402scan and the CDP Bazaar can index it?”
Publishing multi-endpoint agent marketplace listing
“I need to list my image generation API on the CDP Bazaar and x402scan. The API lives at https://api.imagestudio.io and has three endpoints: POST /v1/generate at $0.01, POST /v1/upscale at $0.005, and GET /v1/status at $0. Please produce all the x402 discovery documents — OpenAPI with pricing, well-known resource list, and llms.txt.”
Refreshing discovery docs after adding new endpoints
“My API at https://api.dataenrich.co added two new paid endpoints: POST /v1/enrich at $0.003 and POST /v1/validate at $0.001. Regenerate the OpenAPI 3.1 spec with x-payment-info, the /.well-known/x402 JSON, and the llms.txt so agents can find the updated pricing and schemas.”
Technical details
Endpoint
POSThttps://dev.kagurazaka.dev/v1/discovery?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to produce all three x402 discovery artifacts (OpenAPI, /.well-known/x402, llms.txt) in one call, formatted specifically for x402scan and CDP Bazaar indexing. Prefer it over manually writing OpenAPI specs when you want automatic x-payment-info extension injection and agent-readable output. Ideal for API sellers onboarding to the x402 ecosystem who want immediate discoverability without hand-crafting multiple document formats.
Side effects
- Missing or invalid origin URL returns validation error
- Endpoint list exceeding 100 items rejected
- Malformed endpoint objects missing required fields like method or path cause partial or failed generation
- Invalid price_usd values (negative or non-numeric) may cause schema errors
- Unreachable or non-HTTPS origin may fail validation
- Payment of $0.003 USDC required per call; insufficient payment results in 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | |
| origin | string | the https origin the API is served from |
| category | string | default API |
| guidance | string | how an agent should call the API |
| endpoints | array | each {method: GET|POST, path, price_usd, summary, description, tags, input_example, input_schema, output_example} |
| description | string |
Output
Schema · Response
{
"type": "json",
"example": {
"openapi": {
"info": {
"title": "Weather API"
},
"paths": {},
"openapi": "3.1.0"
},
"llms_txt": "# Weather API\n\n> Current weather for any city.\n...",
"well_known": {
"version": 1,
"resources": [
"https://api.example.com/v1/weather"
]
}
}
}Tags
x402
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