Development x402 offerings

HTTP 404 Not Found: what it means (no such resource), what a client should do (check the URL), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 405 Method Not Allowed: what it means (method not supported here), what a client should do (see Allow header), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 406 Not Acceptable: what it means (cannot satisfy Accept headers), what a client should do (relax Accept), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 407 Proxy Authentication Required: what it means (authenticate to the proxy), what a client should do (send Proxy-Authorization), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 408 Request Timeout: what it means (server gave up waiting), what a client should do (retry), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 409 Conflict: what it means (state conflict (e.g. edit collision)), what a client should do (refresh and retry), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 410 Gone: what it means (permanently removed), what a client should do (delete references), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 411 Length Required: what it means (Content-Length missing), what a client should do (add Content-Length), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 412 Precondition Failed: what it means (If-* condition false), what a client should do (refresh ETag and retry), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 413 Content Too Large: what it means (body exceeds limit), what a client should do (shrink or chunk), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 414 URI Too Long: what it means (URL exceeds limit), what a client should do (use POST), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 415 Unsupported Media Type: what it means (Content-Type not accepted), what a client should do (change the encoding), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 416 Range Not Satisfiable: what it means (range outside the resource), what a client should do (fix Range), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 417 Expectation Failed: what it means (Expect header not met), what a client should do (drop Expect), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 418 I'm a teapot: what it means (April-fools RFC; used to reject bots), what a client should do (stop), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 421 Misdirected Request: what it means (wrong server/connection), what a client should do (reconnect), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 422 Unprocessable Content: what it means (well-formed but semantically invalid), what a client should do (fix the fields), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 423 Locked: what it means (WebDAV: resource locked), what a client should do (wait/unlock), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 424 Failed Dependency: what it means (WebDAV: earlier action failed), what a client should do (fix dependency), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 425 Too Early: what it means (replay risk with 0-RTT), what a client should do (retry later), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 426 Upgrade Required: what it means (switch protocol (see Upgrade)), what a client should do (upgrade), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 428 Precondition Required: what it means (conditional headers required), what a client should do (add If-Match), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 429 Too Many Requests: what it means (rate limited), what a client should do (wait Retry-After, then retry), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.

HTTP 431 Request Header Fields Too Large: what it means (headers too big), what a client should do (shrink cookies/headers), the class it belongs to, whether it is retryable and idempotency-safe, the defining RFC, and common causes. Precise one-code reference for error handling in agents and integrations. $0.01 per call.