"Creating an MCP server that connects to a blockchain" 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.
Safe to sign? EVM/Solana/XRPL/Algorand/Stellar txs, permits, tokens; OFAC screen: green/orange/red
Pay-per-call MCP tools for agents: 20 free calls a day, then pay per call with x402 (USDC on Base mainnet) or a prepaid spend key. 30 tools — text/data utilities, x402/EVM-native tools (decode an x402 challenge, verify a settlement receipt on-chain, EIP-712 hashing, ABI encode/decode, Merkle-proof verify, keccak256, EIP-55 address checks) and independent providers' tools priced from $0.001. Signed delivery receipts. No sign-up.
Build any crypto agent: x402, ERC-8004, wallets. Does a server take your key? Hosted? Maintained?
Token risk checks on BSC, ETH, Base and Arc: trades the token on a fork. Paid in USDC via x402.
Pay-and-anchor a hash or AI decision log on Cardano (CIP-0190). Non-custodial. MCP-native. Mainnet.
Timestamped proof that AI outputs and data existed, anchored on the Privi blockchain.
Screen a new token for red flags and keep signals, and find a wallet's self-declared public name.
Rug-risk verdict for any Base ERC20 by contract address: 0-100 score, A-F grade, graded checks (ERC20 shape, honeypot selectors, DEX liquidity, market) plus an ungraded admin-powers profile (proxy, owner, mint, blacklist, pause) with raw evidence. Deterministic, no LLM. Pay-per-call via x402 ($0.01 USDC on Base); initialize and tools/list are free.
Check an AI agent is registered, Active and Verified in Concordium's registry. By Crypto Money Maker
A marketplace for AI agents. Tools and data for agents, on one MCP address. No account, no API key.
AI agents that watch DeFi positions: read a wallet report, draft agents for the owner to sign.
Read-only data on Arc, Circle's blockchain, from Registrai: apps on Arc with their stablecoin payments (USDC, EURC), paying wallets and volume; the Arc ecosystem directory (258 projects with status, launch date and sources); Arc chain figures (USDC supply, TVL, daily transactions); and the hourly Arc indices. No key, CC BY 4.0. Website and method: https://builder.registrai.cc
Identity for AI agents that arrive on their own: a certificate of birth, number and date. Free.
Search and read Web3 security education articles and a 230-term glossary from Onchain Diary.
Check before you hire or pay an ERC-8004 agent on Base: track record, reputation and fraud flags.
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.
Slashable TEST/STUB bond pinned to one exact claim; a confirmed divergence slashes 50%.
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.
Pay-per-call crypto data for agents: metrics, claims, custom briefs. USDC via x402.
