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2s RFC Lookup
x402
2s RFC Lookup is a paid API for AI agents from 2s.io, paid per call via x402, $0.0012/call, status unknown (last checked 2026-09-13).
Look up metadata for any IETF RFC document by number, returning title, status, authors, dates, and obsolescence relationships
Price / call$0.0012
Success—
StatusUnknown
How this service works
Look up an IETF RFC by number. Pass number as RFC2616, 2616, or the integer 2616. Returns the RFC title, authors, publication date, status (e.g. INTERNET STANDARD, PROPOSED STANDARD, DRAFT STANDARD, INFORMATIONAL, EXPERIMENTAL, HISTORIC, BEST CURRENT PRACTICE), stream (IETF/IAB/IRTF/Independent/Legacy), DOI, canonical rfc-editor.org URL, and the full standards relationship chain: which RFCs this one obsoletes / is obsoleted by, and which it updates / is updated by. Authoritative data from the IETF/RFC Editor index. Use this to resolve whether a spec is current or superseded before relying on it.
Output
Returns a JSON object with the RFC's number, title, publication date, status (e.g. DRAFT STANDARD, HISTORIC), IETF stream, list of authors, DOI, canonical URL, and arrays of RFC numbers it obsoletes, is obsoleted by, updates, and is updated by.
Example use cases
Example prompt
“Can you look up RFC 2616 for me — I want to know its title, who wrote it, when it was published, its current status, and whether it's been obsoleted by anything?”
Technical details
Endpoint
GEThttps://2s.io/api/dev/rfcWhen to prefer
Use this endpoint when you need structured metadata about a specific RFC document — especially status, authorship, and obsolescence chain — without scraping the IETF website. Ideal for agents verifying whether a protocol standard is current or determining which RFCs supersede a given one.
Side effects
- RFC number not found — returns empty or null rfc object
- Invalid RFC number format — query parameter must be a string like '2616' or 'RFC2616'
- Payment failure via x402 — 402 response if USDC payment not provided
- Network timeout for bundled dataset lookup
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"number": "2616"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"rfc": {
"doi": "10.17487/RFC2616",
"url": "https://www.rfc-editor.org/rfc/rfc2616",
"date": "June 1999",
"title": "Hypertext Transfer Protocol -- HTTP/1.1",
"number": 2616,
"status": "DRAFT STANDARD",
"stream": "IETF",
"authors": [
"R. Fielding",
"J. Gettys",
"J. Mogul",
"H. Frystyk",
"L. Masinter",
"P. Leach",
"T. Berners-Lee"
],
"updates": [],
"obsoletes": [
2068
],
"updatedBy": [
2817,
5785,
6266,
6585
],
"obsoletedBy": [
7230,
7231,
7232,
7233,
7234,
7235
]
},
"query": {
"number": 2616
},
"source": {
"url": "https://www.rfc-editor.org/rfc-index.xml",
"license": "Freely usable (IETF Trust; per RFC 8721 / BCP 78, no use restrictions)",
"provider": "IETF / RFC Editor — RFC index (bundled dataset)"
},
"returned": 1
},
"meta": {
"cost": {
"usd": 0.0012,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "dev.rfc",
"settlement": {
"txHash": "0xb740541ce23f8338d571d8e59a906790b38d69c6b3c7821b966c2608eaf346d8",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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