"How to send an email through the end-user's Outlook" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
See which AI models fall for traps in everyday jobs, and check or scan any MCP server, skill or package before your agent installs it. No sign-in; read-only; returns structured data.
Find the best pay-per-call API for any task: price, uptime and real usage across 19,000+ APIs.
Serverless 15-tool B2B email deliverability, domain security, OpenAPI breaking-change release gate, LLMO /llms.txt auditor, and quantitative trading risk MCP connector.
Simceptor is an AI-native Mock API simulation platform with a built-in MCP server. It enables AI agents to create, inspect, update, and test dynamic mock APIs, conditional response rules, stateful session simulations, and network latency directly from context.
Contract-change authorization for AI agents: preflight a change to an API or MCP contract, get a signed decision, and verify the receipt offline. Only a granted change can proceed.
Write, check, render and save sequence diagrams with the request and response on every arrow.
Find and live-check the paid x402 API for an agent task, ranked by real 30-day payers and price.
Traffic Parrot simulates APIs and messaging. Request or withdraw a trial, read docs, send feedback.
Pair-level MCP+A2A conformance verdicts for the exact pair you delegate across.
Test and debug your AI agent's Web Bot Auth (RFC 9421) signature: is it valid, and what to fix?
Is this x402/MPP API safe to pay? $0.001 preflight, fixes, a $0.25 test purchase. Free quick check.
Scores how well AI agents will use your API, 0-100, from its OpenAPI spec. Free and read-only.
Remote MCP that evaluates one public HTTPS URL for WebMCP readiness: intent, tools observed, what to add, what never to expose.
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.
Read and submit the CurlShip directory. Paid actions return checkout_url.
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.
Check an x402 endpoint before you pay it, then test a payment and follow it to settlement.
Live road conditions for the agent web: check a site or API before acting, report after.
Live health leaderboard of x402 paid endpoints, plus an MCP server readiness check
npm MCP — wraps the npm Registry API (free, no auth)
MCP endpoint to APIbase catalog (https://apibase.pro/llms.txt). USDC: x402 Base, MPP Tempo.
Guide developers from setup through a verified, policy-aware, audited Alter API call.
Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.
Trickl for AI assistants: full docs, setup plans, and sandbox tools to test purchases end to end.
Search and read the Flowie Exchange API docs and OpenAPI contract. No sign-in needed.
Research, inference, data/web/email tools, and x402 conformance, service catalog and grade feeds.
Hands-on test results for 560+ remote MCP connectors: does it work, how to sign in, what breaks.
Lints whether a paid API's 402 response speaks the x402 protocol correctly.
What is known to be broken in an MCP server or API operation, with the check that found it.
