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HTTP Status Code Reference
x402
HTTP Status Code Reference is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Look up HTTP status codes by class (4xx), specific code (404), or keyword (teapot, redirect, auth) to get reason phrases and usage explanations
Price / call$0.01
Success—
StatusUnknown
How this service works
HTTP status code reference: give a class like 4xx to list every code in it with its reason phrase, a specific code for its meaning and typical use, or a word (e.g. 'teapot', 'redirect', 'auth') to search. Covers all IANA-registered codes 100-511 including 402 Payment Required (used by x402). $0.01 per lookup.
Output
Returns a list of matching HTTP status codes, each with its numeric code, official IANA reason phrase, meaning, and typical use case. For class queries (e.g. 4xx), returns all codes in that class. For specific codes, returns the single entry. For keyword searches, returns all codes whose names or descriptions match.
Example use cases
Debug unexpected API response codes
“I'm getting a 422 back from an API — what does that HTTP status code mean and what should my client do about it?”
Search codes by authentication keyword
“Which HTTP status codes are related to auth or authorization? Show me all of them with their reason phrases.”
List entire 5xx server error class
“Can you list every HTTP 5xx status code with its official reason phrase and when it's typically returned?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/status-codesWhen to prefer
Choose this endpoint when you need structured, machine-readable HTTP status code data covering the full IANA registry including edge cases like 418 (teapot) and 402 (Payment Required / x402). It supports flexible input — class ranges, specific codes, or natural language keywords — making it ideal for developer tools, API documentation assistants, and debugging agents that need to programmatically enumerate or explain HTTP codes rather than retrieve a single hard-coded explanation.
Side effects
- Invalid or non-existent status code number returns no results or an error
- Keyword with no matching codes returns an empty result set
- Malformed class format (e.g. '4X' instead of '4xx') may not match
- Non-HTTP numeric codes (e.g. 999) return no results since only IANA-registered 100-511 are covered
- Payment failure via x402 prevents the lookup from executing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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