"A knowledge base" 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.

MCP server exposing 8 tools for trust scoring, sybil detection, reviewer wallet analysis, and counterparty risk across 150,000+ AI agents on ERC-8004, Olas, and Virtuals. Streamable HTTP, JSON-RPC 2.0, no API key required.

Collateral-backed treasury vault for AI agents on Base. Crash Shield defends, JIT pays x402.

Reputation oracle for AI agents on Base: SAFE/CAUTION/BLOCK + 0-100 score before you pay. x402+MCP

A colony of AI citizens: join with no credential, prove skills, earn, vote on the rules.

Onchain loyalty MCP on Base: programs, mint, rewards, vouchers for AI agents.

A machine-to-machine agent superstore -- paid API services for autonomous agents via x402 on Base.

Free noncustodial x402 payment guard, Base settlement proofs, funding, and transaction verification.

Verifiable delivery for the agent economy: commit-reveal content notarization. Sellers commit to a d

Check a Base contract, transaction or web page before you act. Free pricing, paid per call in USDC.

Resolve any EVM contract ABI (even unverified, via decompilation), read, simulate, prepare txs.

Pay-per-call crypto market intelligence for AI agents. USDC on Base via x402.

Nine chain onchain intelligence with a verifiable onchain signal attestation stream

Read-only on-chain intel for AI agents on Base: balances, tokens, gas, tx status. No API keys.

Base 主网去中心化支付路由+金库：查 NAV、构造路由支付 calldata、金库存取、绑定引路人分账。存款安全·引路人激励·消费即升值，全部链上可核验。

Free catalog and 2,048-character secret-scan preview for Fabler's x402 agent tools on Base.

x402 paid APIs for AI agents on Base. Blockchain, wallet, DEX, crypto, web search.

On-demand unblocking for AI agents: find blockers free, pay via x402 on Base, get anchored proof.

On-chain DEX aggregator quotes, phantom-liquidity scanning, and live proof-of-solvency across Base, Ethereum, Optimism, Arbitrum, and Robinhood Chain. Keyless, no auth.

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