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agent402.tools API Investigation
x402
agent402.tools API Investigation is a paid API for AI agents from agent402.tools, paid per call via x402, $0.017/call, status unknown (last checked 2026-09-14).
Investigates an unknown API endpoint to discover its auth scheme, content type, versioning, rate limits, OpenAPI/Swagger spec, and JSON response structure
Price / call$0.017
Success—
StatusUnknown
How this service works
Bundled execution of the API investigation workflow - Point at an unknown API endpoint and figure out how to use it: auth scheme, content type, version, rate limits, OpenAPI/Swagger spec discovery, and JSON response structure. The deterministic recon workflow before writing a single line of integration code. One x402 payment runs 7 underlying tools (url-parse, http-check, http-headers, extract, html-links, json-format, json-query); partial-success per step.
Output
A structured report covering the detected authentication scheme (e.g. Bearer, API key, Basic), content type, API version, rate limit headers, any discovered OpenAPI/Swagger spec URL, and an annotated sample of the JSON response structure returned by the endpoint.
Example use cases
Example prompt
“I found this API endpoint at https://api.someservice.com/v1/users but I have no idea how to use it — can you investigate it and tell me what auth method it uses, whether it has an OpenAPI spec, its rate limits, and what the JSON response looks like?”
Technical details
Endpoint
POSThttps://agent402.tools/api/skill/api-investigationWhen to prefer
Use this endpoint when you have a URL for an unfamiliar or undocumented API and need to quickly understand how to integrate with it — especially when you want to avoid manual trial-and-error exploration. Prefer this over generic HTTP inspection tools when you need a bundled, structured output covering auth, versioning, rate limits, and schema discovery in one call.
Side effects
- Target URL is unreachable or returns a network error — investigation cannot proceed
- Target endpoint returns an HTML page (e.g. landing page) rather than an API response — limited useful metadata extractable
- Rate limits or IP blocks on the target API prevent probing — partial results only
- Target API requires mandatory auth before returning any response — auth scheme may be inferred but response structure unavailable
- Malformed or non-standard OpenAPI specs may not be detected
- Non-JSON response bodies limit response structure analysis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| endpoint | string | API URL to investigate (e.g. https://api.example.com/v1/users) |
Output
Schema · Response
{
"type": "json",
"example": {
"args": {
"endpoint": "https://agent402.tools/api/pricing"
},
"pack": "api-investigation",
"steps": [
{
"ok": true,
"slug": "url-parse",
"result": {}
},
{
"ok": true,
"slug": "http-check",
"result": {}
},
{
"ok": true,
"slug": "http-headers",
"result": {}
},
{
"ok": true,
"slug": "extract",
"result": {}
},
{
"ok": true,
"slug": "html-links",
"result": {}
},
{
"ok": true,
"slug": "json-format",
"result": {}
},
{
"ok": true,
"slug": "json-query",
"result": {}
}
],
"summary": "7/7 steps succeeded"
}
}Tags
x402
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