"dev.to" matching MCP connectors:

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Audits a sample of HTTP request URLs against explicit, documented cache-key standardization rules...

Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature...

Replay supplied records against old and new bounded JSON Schema draft-07 contracts. Receive exact...

Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.

Webhook capture bins for agents: get a URL, wait for webhooks, set replies, verify signatures.

x402 market intel: providers ranked by real payers; seller vetting; schema drift. $0.01 auto-pay.

Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.

Verify an agent's advertised route, price, payment details, and schemas against its live endpoint.

Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).

Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.

Deterministic JSON checks with signed evidence and x402-paid execution

Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.

MCP server that delivers up-to-date Bitrix24 REST API documentation.

Unified gateway exposing 150+ tools across all NexGenData MCP servers via one endpoint.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key

Instant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.

Free *.pntr.dev dev subdomains — register subdomains, manage DNS and wildcard records, receive email on disposable inboxes, and capture HTTP requests for webhook debugging. OAuth sign-in; free tier.

GIBS

dev.gibs.mcp

Gibs is a multi-regulation compliance API for developers building applications that need to reason about EU regulations. Classify AI systems under the EU AI Act, ask compliance questions about GDPR and DORA, and get source-cited answers with article-level traceability — all in one API call.