"Interactive Network Graph Visualization Tools (No Account Required)" matching MCP connectors:
GET /v1/connectors — MCP directory API referenceMatching Connector Tools:
Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.
Any API, four tools: discover, call with routing and signed receipts, verify, dispute.
Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.
Your DRF API as MCP tools — 1,800 endpoints become 16 dispatchers, permissioned by Django.
npm MCP — wraps the npm Registry API (free, no auth)
Point Claude Code, Qwen Code, Cursor, or any MCP client at https://docs.jmeter.ai/api/mcp and your agent answers JMeter questions grounded in this documentation, with a source link for every answer. Free, no API key, no signup.
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
MCP tool observatory: do registry servers answer, and are their answers true? No key.
Ephemeral mailboxes and a mock OAuth IdP for testing email and auth flows — 39 API-driven tools covering mailboxes, mails, attachments, domains, teams, and mock identities.
Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).
Cloudflare Workers MCP server: interactive-api-playground
Unified gateway exposing 150+ tools across all NexGenData MCP servers via one endpoint.
An MCP server that provides tools to validate an email address using Dilli Email Validation API.
40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools
- NahookOAuthcom.nahook.mcp
Manage your Nahook webhooks from your AI client — inspect deliveries, retry failures, and manage endpoints. Connects over OAuth, no API keys
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.
327 tools, 92 providers. Pay per call via x402 + MPP. One MCP endpoint.
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.
