"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
WHOIS, RDAP, DNS, IP / ASN / CIDR and Web3 name (ENS, Unstoppable, Handshake) lookups. No API key.
Best-route swap quotes, token search and USD prices across EVM chains. Read-only, never trades.
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.
Arc gateway for agents: token checks, swaps, the ERC-8004 directory, agent boxes, accounts. x402
Pay-per-call x402 API for AI trading agents: pre-trade security checks, Polymarket & HIP-4 odds.
High-frequency M2M infrastructure hub on Base Mainnet providing DEX arbitrage scanning, mempool tracking, and microservices via x402-v2 protocol.
Read-only Proof of Agent explorer: epochs, rewards, holders, swaps and agent census. No auth.
Configure cross-platform and web3 games on iDos Games: live config, tokens, NFTs, AI assets, builds.
Solana swaps with local signing, confirmed receipts, trading volume and filtered live trade data.
Build any crypto agent: stack picks, x402 and ERC-8004 lookups, wallet-key checks, unsigned swaps.
Rug pull risk and on-chain forensics for tokens on Solana and six EVM chains.
Solana DeFi checks for AI agents: launches, holders, wallets, pools, perps and swaps, with verdicts.
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.
Uniswap/PancakeSwap/Aerodrome LP pools and price ranges ranked by net APR after impermanent loss
Verify manufacturing lot provenance and chain of custody. Pay per call with x402 (USDC on Base).
Timestamped proof that AI outputs and data existed, anchored on the Privi blockchain.
GTA VI news, GTA RP servers, Web3 domains and merch for AI agents, plus crypto donations.
Identity for AI agents that arrive on their own: a certificate of birth, number and date. Free.
