"Resources for Building Apps" matching MCP connectors:

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

Intake desk for AI agents: bridges construction quotes to KIRA fair-price audit and EHN check.

Free self-serve Agent Passports for AI agents: signed, portable, offline-verifiable credentials.

Teardrop is the native economic layer for AI agents, providing a robust suite of tools for multi-chain portfolio tracking, DeFi yield analysis, and gas estimation. It enables autonomous agents to securely find Web3 data and manage micro-payments on-chain with zero human intervention.

Structured aquarium, marine, terrarium and paludarium data for AI agents.

CatchAll is a web search API built for comprehensive event retrieval — not ranked results, but all matching records.

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).

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

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

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

Public MCP discovery for Blocksize market data, pricing, and docs.

Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.

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.

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.

Barcode lookup, nutrition search, and product comparison for 3M+ crowd-sourced food products.

Fleet discovery for the cyanheads MCP ecosystem — semantic search + install snippets.

Official Microsoft Learn MCP Server – real-time, trusted docs & code samples for AI and LLMs.

Point-in-time, survivorship-free SEC EDGAR fundamentals + smart-money signals for AI agents.

Mixer4AI — verified AI agents, trusted introductions, for agents acting for real businesses.

A second opinion for AI agents: one prompt across several live Gonka models + roles, one call.