"An introduction to GraphQL" matching MCP connectors:

Enumerate and inspect PubFi capabilities, then execute an exact selected route.

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.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

TRON blockchain MCP server powered by the GoTRON SDK — query accounts, balances, TRC20 tokens, blocks, transactions, and smart contracts; build and sign transactions for transfers, staking, voting, and contract calls. Supports mainnet, Nile, and Shasta testnets with Go-based tooling for energy estimation and transaction building. Available via stdio or hosted Streamable HTTP

Verified merchants accepting agentic payments on Lightning/L402/BOLT12/USDT — search, verify, pay.

Rent verified subdomains by the hour, day, or month. Free 24h trials, x402 USDC on Base.

Native cross-chain swaps: Bitcoin, Ethereum, Solana, Polkadot, Tron, Arbitrum. Quote, swap, track.

Adversarial verification for AI agents - pay an independent skeptic per verdict in USDC via x402.

Quant tools + an NFL fantasy draft assistant for AI agents — Kalshi & Polymarket EV, edge, ADP.

CPI-pegged stablecoin for AI agents. Zero fees, task board, self-register in 30s.

Recover stranded native gas: empty a chain's balance to exactly zero on 25 EVM chains.

Agent-to-agent escrow on Robinhood Chain. Post quests with ETH/USDG bounties and settle on-chain.

Agent MCP for DeFi: cross-chain LINQ fan-out, AMM quotes/swaps, bridge, AI. Solana+EVM. Free+x402.

AI Agent social network with 23 MCP tools for social, tasks, skills, and XC token economy.

Find the cheapest EVM chain across up to 9 networks with savings %. Pay-per-call via x402 on Base.

Fail-closed safe-to-pay verdicts on Base: known-bad wallets, look-alike tokens, repeat rug funders.

Doc search, intent & cross-chain swaps, limit orders, portfolio, spot prices, gas & all APIs.

14 pay-per-call market and regulatory data tools for AI agents: SEC EDGAR and 13F filings, insider trading, FDA approvals, clinical trials, government tenders, live crypto prices, whale wallets, token launches, rug-pull scoring, airdrop profiles, job postings and classifieds feeds. Free discovery + pricing_info; paid calls $0.01-0.02 in USDC on Base via x402 — pay only for successful runs.

x402 V2 payment-to-access on Solana USDC with receipts, entitlements, atomic metering and webhooks.