"SearXNG - Open Source Metasearch Engine" matching MCP servers:

Provides AI agents with 200 deterministic micro-services covering code auditing, 3D/robotics, media processing, cryptography, blockchain settlement, AI safety, networking, and math, with automatic x402 USDC micropayments.

Complete DeFi intelligence — Yield, Staking, Restaking, RWA, Perps, Gas Optimization & Contract Security. One answer, not raw data.

Deterministic Risk Oracle for DeFAI Agents.

Real-time DEX token momentum, orderbook liquidity depth, and whale flows on Base Mainnet gated with gasless x402 micropayments.

Exposes fourteen read-only tools over the HEY Research public API, letting assistants look up Robinhood Chain projects, builders, shipped work, relationships and market context, with each answer tagged FACT, DERIVED or UNKNOWN and unmeasured fields omitted rather than zeroed. Runs over stdio or hosted Streamable HTTP, and gives no trade instructions.

Autonomous M2M compliance and trust APIs for AI agents (KYB, OFAC, VAT, Sanctions checking).

Enables AI agents to query real-time SEC EDGAR XBRL financial ratios with automatic USDC micropayments via the x402 protocol on Base Mainnet.

Enables AI agents to securely use Open Agent ID credentials for signing requests, looking up agent data, and exchanging encrypted messages. It performs all cryptographic operations within the server process to ensure private keys are never exposed to the AI agent.

Non-custodial x402 MCP payment layer for AI agents — the open-source alternative to Vercel x402-mcp

Pay-per-use semantic web search for AI agents. Powered by SearxNG, agents pay in sats via Lightning Network micropayments — no API keys required.

23 tools for AI agents working with Nostr Open source. No API key. No account. NIP-46 remote signing Publish notes, reply, react, repost Encrypted DMs (NIP-04 + NIP-44) Fetch events, profiles, social graph

An MCP server that records consented, attributed, paid-for receipts for open-source dependencies, settling per-call USDC payments on Algorand with on-chain attribution.

CheapestInference — unlimited flat-rate API for frontier open-source LLMs

MCP server for Pi Network that enables AI agents to query Pi chain data (balances, transactions) and verify user tokens, with optional payment sending that is off by default.

Enables static security audit of Solidity smart contracts by analyzing source code or deployed bytecode for vulnerabilities, providing risk scores and detailed findings.

Quick-scan a smart contract for rug, honeypot, or centralization risk before sending funds. It combines verified source, live on-chain state, and heuristic Solidity analysis to return a SAFE/CAUTION/HIGH-RISK verdict.

Enables cross-chain swap execution across 12 venues and 17 chains, including native Bitcoin as source or destination, with tools for quoting, execution, status, and health checks. No signup, API key, or protocol fee required.

Per-transaction crypto trade validator for AI agents, validates trades with PROCEED/CAUTION/BLOCK verdicts, scans tokens for anomalies, detects rug pulls, and searches across DEXes. Powered by WaveGuard physics engine with deterministic PDE-based analysis.

Read-only MCP server for Sui blockchain analytics with 44 tools covering wallets, DeFi, NFTs, token prices, transactions, fund tracing, pools, staking, Move decompilation, and MVR name resolution.

Deterministic risk governance for crypto trading agents. 5-level policy engine with position sizing, leverage limits, and trade blocking. One tool: get_risk_policy. Supports BTC and ETH.

On-chain investigation and analysis tools for Solana blockchain, enabling detection of wash trading, funding source tracing, holder concentration analysis, and MEV/bundle activity identification.

Provides local access to Aztec documentation, examples, and source code via cloned repositories, with optional semantic search for enhanced querying.

A self-hosted decision engine that sits between an AI agent and blockchain execution. Agents submit a proposed action, Guardian returns an explainable ALLOW / WARN / BLOCK before anything gets signed or broadcast.

MCP server exposing ATLAS research capabilities: live tokenized stock market data, on-chain source-of-truth reads, and published research atlases. Connects to MCP clients over stdio with no API keys required for public testnet endpoints.

Read-only MCP server that enables natural-language queries about Solana NFTs, including ownership history, freeze/burn rights, marketplace sales and floors with source and currency, directly from the chain and marketplaces without sign-up.

Read-only MCP server for your Nimiq books: balances, classified history, daily statements priced at each day's close, staking positions, yield projections and rewards. Drafts payment requests and stake links that open in the NimBooks app. Never signs, holds no keys, runs locally.

Real-time perp market-data for AI trading agents — funding rates, funding-arb signals, open interest, volume, orderbook depth/slippage and oracle families across 25 venues, plus HIP-3 RWA coverage (tokenized stocks, metals, oil) that mainstream aggregators lack. x402-native pay-per-call (USDC on Base): one free funding screener tool + 11 paid tools with auto-pay.

Enables AI assistants to audit Solidity smart contracts for security vulnerabilities, fetch verified source code from block explorers, decode calldata, and estimate gas costs across major EVM networks.

Enables Claude Code, Cursor, or any MCP client to ask open and uncensored AI models questions privately, attaching a fresh zero-knowledge proof to each one so the gateway can verify it was paid for without learning who asked. Also lists models and costs, reports remaining questions, and buys new questions with USDC on Solana via x402.

MCP server for TaskMarket, an onchain marketplace, enabling agents to check market stats, list/open tasks, and prepare safe delegation commands without moving funds.