"Simple HTTP server or client implementation" matching MCP connectors:

AI-agent image generation: cohesive sets & illustrations. PNG/WebP (optional transparency) or JPEG.

Cello MCP server to launch and manage your User Referral and Partner program — for developers and growth teams.

Public data intelligence for AI agents — CVE, compliance, patents, contracts, domains.

Live multi-asset market data for AI agents with provenance, starter credits, x402, and examples.

rnv-color-mcp, a hosted color-workflow MCP server (Python, Streamable HTTP). Tools: mix (including Kubelka-Munk paint physics), convert between formats, generate harmonies, transform text case, and save/list/get named palettes. It resolves hex / CSS / custom brand color names and refuses unknown colors rather than guessing.

Evidence-gated task verification for AI agents. Decompose goals into acceptance criteria, attach proof (screenshot, curl, file), independent LLM judge accepts or rejects. 24 tools. Hosted remote MCP (streamable-http, OAuth 2.1 + DCR).

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

Eligibility-first UK & EU grant discovery, inside ChatGPT and Claude. Checks eligibility before recommending, explains why each grant fits, and cites the funder's own page on every answer — with an honest "competition_risk: unknown" when the data isn't there. 6 tools: search, fetch, find_opportunities, should_apply, explain_opportunity, complete_profile. Transport: Streamable HTTP. Auth: OAuth 2.1 + PKCE. Free to install, no card required.

MCP server for GOV.UK — search, content retrieval, organisation lookup, and postcode resolution.

AI infrastructure design agent. Describe your app in plain English; Riley designs, prices, and deploys AWS or GCP infrastructure with generated Terraform.

MCP server for German & EU law. Verified, citable legal context for any LLM. Daily updates from official sources, hosted in Germany

The PropelAuth Integration MCP Server helps you and your favorite AI agent integrate PropelAuth as quickly and easily as possible into your project. Whether you're integrating PropelAuth into your Next.js project or your FastAPI backend, the Integration MCP Server will ensure your AI agent has the best context possible for a successful integration.

Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

Search foods, compare nutrients, and look up the full USDA FoodData Central database.

Link compounds to protein targets, rank bioactivity, and look up drug mechanisms and indications.

MCP server for nonprofit financials via ProPublica — IRS Form 990 data for 1.8M+ nonprofits.

Fetch METARs, TAFs, PIREPs, and domestic SIGMETs from the NWS Aviation Weather Center.

Query US Treasury national debt, interest rates, exchange rates, and fiscal datasets via MCP.

Real-time options analytics MCP server. Access gamma exposure (GEX), delta exposure (DEX), vanna exposure (VEX), dealer positioning, volatility surfaces, Black-Scholes greeks, implied volatility solver, and key options levels for any US equity — all through natural language. 14 read-only tools covering exposure metrics, volatility analysis, pricing, and market data.

FCC broadband availability, coverage analysis, and digital divide data for US geographies.