"An open-source relational database management system" matching MCP connectors:

Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Open agent work plus independent resolver task v1; earn tag-scoped standing.

Screen an Ethereum address or ENS name for on-chain reputation risk, sanctions, and reasoning.

An identity and memory layer for AI agents on the Emercoin blockchain. An agent claims a GitHub-rooted on-chain identity and stores verifiable hashes of its research and memory as Emercoin NVS (Name-Value Storage) records, through a small authenticated HTTP API and an MCP server. Neutral and provider-independent — not tied to any single AI vendor. FREE

The OpenZeppelin Stellar Contracts MCP server generates secure smart contracts for the Stellar blockchain based on OpenZeppelin templates. It integrates with AI assistants to automatically enforce OpenZeppelin's security best practices, style rules, and standards at every prompt, enabling developers to create production-ready Fungible Token, Non-Fungible Token, and Stablecoin contracts through AI-driven workflows.

Deploy ERC-20 tokens on Ethereum, Base, BNB Chain, Polygon, and Sepolia testnet via one MCP tool call. Returns a deployed contract address. $10 flat fee per mainnet deployment — same as human users. Free on Sepolia testnet. Requires an API key from https://avagenesis.com/api/agents/keys

Prove a real, unique human performed an action; mint a signed, verifiable Proof-of-Human credential.

A labor market where AI agents hire other AI agents — on-chain escrow, independent grading, pay-on-pass, and an on-chain credit score. Sepolia testnet.

web3d-mcp is an MCP server for AI-powered 3D scene and ad generation on the web. It provides tools to generate, edit, animate, preview, validate, and export 3D scenes built with React Three Fiber (R3F). Designed for web developers and creative teams, it enables programmatic creation of production-ready interactive 3D web experiences and advertisements through natural language.

Canton ledger tools over MCP: DAML commands, CIP-56 assets, DvP settlement, party management.

Non-custodial execution primitives for DeFi on Solana. 1 bps to open. Everything else is free.

Open API Marketplace for AI Agents. Crypto data tools with USDC payments on Base.

An MCP server exposing 5 specialized tools for LLM agents to perform strict logical, mathematical, and architectural analysis. Includes text-parsing algorithms to detect semantic buzzwords (veritatem_audit), mathematical calculators to evaluate smart contract ROI viability (hamilton_extraction_check), chronological timeline generation (greene_execution_sprint), alternative pathing logic (franklin_lateral_pivot), and Web3 centralization detection (marshall_immutability_check).

An agent-to-agent marketplace where AI agents discover, hire, and pay each other in USDC on Base. Agents list services, post jobs, submit proposals, and invoke each other's capabilities — all through API, MCP, or A2A protocol.

The OpenMesh MCP Server provides decentralized, permissionless cloud infrastructure that integrates AI assistants with Web2 and Web3 applications without middlemen. It offers intelligent service discovery to identify MCP servers, acts as a universal proxy for routing requests to discovered services, implements performance optimization through usage feedback, and provides automatic fault tolerance with alternative services when servers become unavailable.