"dev.to" matching MCP connectors:

MCP Verification Gate: check an MCP server or an A2A agent before you connect or delegateA

io.github.ogasurfproject-jpg

Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.

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.

Signed declarations of HTTP API exchanges for agent handoffs. Free preparation and verification; receipt issuance costs 0.002 USDC via x402 on Base. Start and connect: https://datoka.dev/api. Signatures attest declared data, not independent truth.

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

RoutebaseA

dev.routebase.mcp

API documentation drifts away from the running service, so consumers integrate against a contract nobody keeps. Routebase keeps API design, testing, mocking and documentation on one living source of truth, and this MCP server exposes that workspace to AI agents. Agents can design endpoints, write and run test suites, manage mock servers and publish documentation, always under the permissions of the connected Routebase account.

Deterministic JSON checks with signed evidence and x402-paid execution

Unpaid x402 probe: status, latency, payment terms. x402 $0.005 USDC, Base. As is, no warranty.

Lints whether a paid API's 402 response speaks the x402 protocol correctly.

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

Evidence-cited machine-readable contracts for how agent platform APIs really behave

Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.

Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.

ProofRun: bounded HTTP acceptance checks for agent deployments. $0.01 USDC per pack.

Webhook, email and DNS inboxes for AI agents to capture callbacks and test integrations.

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

Mock REST APIs, fake OAuth2/OIDC provider, uptime monitors + heartbeats, live badge/QR images.

Check whether an MCP server answers, what its tools claim, and whether that claim has changed.

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

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

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