"browser tool" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Serverless 15-tool B2B email deliverability, domain security, OpenAPI breaking-change release gate, LLMO /llms.txt auditor, and quantitative trading risk MCP connector.
Grade MCP tool definitions for agent-readiness: score, A-F grade, fixes, est. token cost.
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
Hosted MCP infrastructure with seven typed tools: JSON repair, JSON Schema validation, JSON to TypeScript, CSV to JSON, JSON to CSV, OpenAPI security and webhook checks. Public tool discovery; execution uses scoped Bearer keys with tool allowlists, quotas and request IDs. Free deterministic calls, no LLM calls or USDC payments. Runnable repair → validate → CSV example: https://invokeport.com/agents/workflows/json-pipeline. MCP through 2025-11-25; custom headers, no OAuth.
Lints whether a paid API's 402 response speaks the x402 protocol correctly.
Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
MCP tool observatory: do registry servers answer, and are their answers true? No key.
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
Check whether a URL can be opened. No browser is launched.
Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.
Instant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.
Search a catalog of tools and APIs, inspect endpoint schemas and prices, and run endpoints from an MCP client. Runs can use a prepaid workspace balance. The hosted server supports OAuth and bearer authentication.
Check public MCP reachability, protocol handshake, auth and tool schemas before connecting.
