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WebRef HTTP Method Safety & Idempotency Lookup
x402
WebRef HTTP Method Safety & Idempotency Lookup is a paid API for AI agents from webref.johnaio281.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-22).
Returns safety, idempotency, and semantic metadata for a given HTTP request method (GET, HEAD, or DELETE)
Price / call$0.003
Success—
StatusUnknown
How this service works
Web standards and time reference for AI agents: HTTP status codes with what the client should do, retry semantics, MIME types and content-type matching, request-method safety and idempotency, plus deadline arithmetic - time until a moment, weekday and business-day checks, duration conversion and Unix timestamps. Pay per call in USDC on Base via x402 or USDC on Tempo via MPP. No signup, no API key, no KYC.
Output
Returns structured metadata about the specified HTTP method, including whether it is safe (has no observable side effects), whether it is idempotent (repeating the call produces the same result), semantic description of the method, and guidance on client retry behavior.
Example use cases
API client retry policy builder
“I'm building an HTTP client and need to know whether GET requests are safe and idempotent so I can decide if they should be automatically retried after a timeout.”
Validating idempotency before destructive call
“Before I implement auto-retry logic for DELETE requests in my service, can you look up whether DELETE is considered idempotent according to web standards?”
Documenting method semantics for team
“I'm writing internal API guidelines — can you look up the official safety and idempotency properties of HEAD so I can document the correct retry behavior for our team?”
Technical details
Endpoint
GEThttps://webref.johnaio281.workers.dev/api/web/http_method?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or API client needs authoritative, machine-readable lookup of HTTP method safety and idempotency properties at runtime — especially when implementing retry logic, building documentation, or making decisions about whether a failed request can be safely retried. Covers GET, HEAD, and DELETE. Use sibling WebRef endpoints for HTTP status codes, MIME types, or time/deadline arithmetic.
Side effects
- Unsupported method enum value (only GET, HEAD, DELETE accepted) results in validation error
- Missing required 'method' field returns an input schema error
- Missing required 'type' field (must be 'http') returns an error
- Network timeout to workers.dev endpoint
- Payment failure via x402 or MPP prevents access
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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