Development x402 offerings

Review dependency cycles, declared evidence and completion prerequisites; no partner verification or evidence entailment.

Check declared MCP tool contracts before an upgrade. Compare required names and exact input/output schema digests with a supplied server snapshot, protocol version and transport. No server contact, semantic schema-subtyping proof or official conformance certification.

Check declared MCP tool contracts before an upgrade. Compare required names and exact input/output schema digests with a supplied server snapshot, protocol version and transport. No server contact, s…

Generate 16–256 original synthetic sine/noise samples with seeded LCG noise and declared nonoverlapping blink-like pulses, single-sample spikes or dropouts. Returns artifact labels in arbitrary synthetic units. Toy test data only, not physiological simulation or third-party research data; no participant signals.

Check up to 64 workflow steps for duplicate IDs, missing dependencies and cycles. Returns a deterministic topological order only when valid. No scheduling, tool execution, access approval or guarante…

Choose a context budget before an agent run. Compare five extractive compilation budgets with token estimates and source coverage. Price basis: five compiler runs, the comparison table and the receip…

Compare two texts using deterministic longest-common-subsequence line matching. Returns unchanged, removed and added lines. Preserves whitespace within lines; normalizes CRLF/CR to LF. Maximum 200 li…

Create learning objectives, modules, exercises, assessments, and delivery guidance for the supplied audience. Uses buyer-supplied information only; no external research or outbound actions. Returns a…

Remove explicitly named RFC 6901-style JSON object paths; replace targeted array elements with null to preserve indices. Handles escaped slashes/tilde, reports missing paths, and rejects duplicate ke…

Extract ATX headings with levels and source line numbers from Markdown, excluding fenced code blocks. Leaves inline Markdown in titles unchanged. Setext and container-nested headings are outside the …

Extract functional and nonfunctional requirements from supplied text, with source references and unresolved ambiguities. Uses buyer-supplied information only; no external research or outbound actions…

Suggest JSON-LD structures from supplied facts and list required missing fields; do not fabricate ratings or reviews. Uses buyer-supplied information only; no external research or outbound actions. R…

How do I fix or improve my x402 endpoint? Diagnoses it, then returns per problem the concrete change as code for your stack (Express, Next.js, Hono or raw HTTP), filled in with your own payTo, amount, network and route. A working endpoint gets improvements to be found, trusted and paid: ERC-8004 identity, Base Builder Code, x402scan ownership proof, skill.md, browser paywall. Bulk: 1000 credits for $0.80 via /api/v1/credits.

x402 endpoint check: validate an x402 endpoint and audit its Bazaar listing before you pay for it or list it. One unpaid probe (never pays the target) grades the 402 challenge, schemas, examples, name, tags and latency, and adds Coinbase's validator verdict, the live Bazaar listing (30-day calls, payers, stale metadata) and search rank for its own name and tags. Returns score, grade and prioritized fixes. 0.005 USDC/call; failed calls are free.

Demo endpoint — proves your payment flow works.

Predicts whether a GitHub repository will merge an AI-authored or external pull request, based on its stated AI/contribution policy and historical merge rates.

Catch a breaking schema change before it reaches production: post one {schema, actual} JSON pair and get a compatibility report with an RFC 6901 JSON Pointer to every mismatch, the keyword that faile…

Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Sola…

Git Changelog Generator: Diff git commits and generate a structured breaking-change changelog. Provide repository_url, base_commit, and optional target_commit. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/changelog_git.

OpenAPI Changelog Generator: Diff two OpenAPI specs and generate a structured breaking-change changelog (no LLM — deterministic diff). Provide base_spec_url and new_spec. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/changelog_openapi.

Execute code snippets remotely and receive execution output, logs, and errors via a secure HTTP API.

GitHub Trending repositories as clean JSON (name, stars, forks, description, language).

Inspect a public webpage for automation readiness, integration links, forms, robots policy, and security headers.

npm package downloads, current version, and license — latest version, license, and last week's download count for an npm package. Parameter: ?name=<package> (e.g. express, or @scope/name for a scoped package).