Development x402 offerings

HTTP 451 Unavailable For Legal Reasons: what it means (blocked by law/takedown), what a client should do (do not 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 500 Internal Server Error: what it means (server bug), what a client should do (retry with backoff), 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 501 Not Implemented: what it means (method unsupported by server), what a client should do (do not 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 502 Bad Gateway: what it means (upstream failed), what a client should do (retry with backoff), 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 503 Service Unavailable: what it means (overloaded or down for maintenance), what a client should do (wait Retry-After), 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 504 Gateway Timeout: what it means (upstream timed out), what a client should do (retry with backoff), 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 505 HTTP Version Not Supported: what it means (protocol version rejected), what a client should do (downgrade), 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 506 Variant Also Negotiates: what it means (negotiation misconfigured), what a client should do (report), 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 507 Insufficient Storage: what it means (WebDAV: out of space), what a client should do (free space), 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 508 Loop Detected: what it means (WebDAV: infinite loop), what a client should do (fix bindings), 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 510 Not Extended: what it means (extension required), what a client should do (add extension), 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 511 Network Authentication Required: what it means (captive portal), what a client should do (log in to the network), 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.

Research PoC: resource-URL filter characterization (C_httpbin402)

Research PoC: resource-URL filter characterization (A_httpbin200)

Run Python code in a sandbox: execute Python in Google's hosted sandbox (not on this service's machines) and get the code, its printed output and the outcome back. Use it for calculations, data transforms and checks an agent should not do in its head. Input: code. Questions over BigQuery data: data.query.

BigQuery SQL: run a read-only SQL query, including against Google's public datasets (Wikipedia, GitHub, blockchains, weather, census and more), and get columns and rows back as JSON with the bytes pr…

Run Python code in a sandbox: execute Python in Google's hosted sandbox (not on this service's machines) and get the code, its printed output and the outcome back. Use it for calculations, data trans…

Ask a database in plain English (text to SQL): any BigQuery table, including Google's public datasets. The SQL is written for you, run under a byte ceiling, and the rows are read back into a written …

Test any x402 endpoint with a REAL signed payment from a fresh unfunded wallet — no funds can move. Returns the facilitator's verdict (healthy / broken / payment-ignored), decoded challenge, lint checks for silent payment-killers like over-long resource descriptions, and a 402index discovery report. Config validators check your paperwork; this reports what the facilitator actually said. Run it from CI after every deploy.

Generates custom image-processing functions and code snippets from prompts to automate transformations, filters, and analysis.

Generates automated test cases and assertions for images based on visual properties (color, size, format, metadata) using AI.

invinoveritas /review/external — the scaffold's GOVERNANCE layer: second-opinion review of code or agent output (Sentinel) before you act on it. Part of the

Resolve an RFC 6901 JSON Pointer (e.g. /items/0/name) against a JSON value. Returns the value or found:false.

Repair malformed JSON text into valid parsed JSON: markdown code fences, single quotes, smart quotes, unquoted keys, trailing commas, comments, Python literals (True/None), raw newlines in strings, and truncated output (auto-closes strings, arrays and objects). Returns the parsed value plus a log of every repair applied. Built for LLM output that almost parses. POST a JSON body like: {"text":"```json\n{name: 'Ada', age: 36, tags: ['x',], active: True"}