"A guide to finding data in public databases" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Pre-trade token safety check for AI agents. Simulates a sell before you buy, then returns one low/medium/high/unknown verdict with the signals behind it: sellability, buy/sell tax, liquidity depth, pair age, same-ticker impersonation, owner powers from bytecode. Ethereum, BSC, Base, Solana. Fail-closed - a check that cannot run answers unknown, never low. Publishes its own measured error rate with the benchmark harness in the repo. Free, no signup, no API key, MIT.
Pay-per-call MCP tools for agents, settled with x402 (USDC on Base mainnet). 17 tools — text/data utilities plus x402/EVM-native: decode an x402 challenge, verify a settlement receipt on-chain, EIP-712 typed-data hashing, ABI encode/decode, Merkle-proof verify, keccak256, and EIP-55 address checks. No API keys.
Safe to sign? EVM/Solana/XRPL/Algorand txs, permits, EIP-7702, tokens; OFAC screen: green/orange/red
58 pay-per-call tools for AI agents: balances, tokens, blocks, gas, transactions, receipts, nonces and logs on Base, Ethereum, Arbitrum, Optimism and Polygon, plus Bitcoin fees and addresses, Lightning invoices and ENS. USDC via x402.
Solana swaps with local signing, confirmed receipts, trading volume and filtered live trade data.
Sentio Connect helps users track public wallet addresses, check token balances and prices, calculate portfolio value, inspect DeFi positions, and review holding history across supported chains.
64 tools: balances, blocks, gas, txs and logs on 5 EVM chains, plus Bitcoin. 25 free calls.
Live Base Mainnet on-chain data (gas, DEX, Aave, token risk, prices). Pay per call in USDC via x402.
A marketplace for AI agents. Tools and data for agents, on one MCP address. No account, no API key.
Uniswap/PancakeSwap/Aerodrome LP pools and price ranges ranked by net APR after impermanent loss
Exchange-exact crypto derivatives data for AI agents: OI, funding, liquidations, 13 venues, 42 tools
Identity for AI agents that arrive on their own: a certificate of birth, number and date. Free.
AI agents that watch DeFi positions: read a wallet report, draft agents for the owner to sign.
Search and read Web3 security education articles and a 230-term glossary from Onchain Diary.
Evidence-backed DeFi yield data for ~17,000 pools: rates, yield sources, 90-day history. Read-only.
Evidence-backed DeFi yield data for AI assistants: market summaries by chain or protocol, pool detail with base vs reward-token APY, 90-day history and side-by-side comparisons for ~17,000 pools on 100+ chains. Every number dated; unknowns stay unknown. Read-only: no wallets, signing or transactions. No sign-in needed. Docs: https://web3juice.com/mcp
Peer protocol seller-rate and liquidity history on Base. Paid aggregate reads via x402 USDC.
Smart contract security screening for Base. Check any contract or token for risk before interacting with it: Solidity source verification, upgradeable proxies and admin or mint powers, holder concentration, dangerous selectors, and B20 issuer powers. It surfaces the usual rug pull and scam indicators. The free tool needs no wallet and no API key; the paid Flash Audit (3.49 USDC over x402) returns a report with an anchored SHA-256. Payment is the only gate.
A haven for agents offering permanence, a verifiable identity, and nothing for sale.
Pay-per-call crypto data for agents: metrics, claims, custom briefs. USDC via x402.
