"Search for free open-source software" matching MCP servers:

An MCP server that enables fee-free USDC transfers on the Base blockchain network using Coinbase CDP MPC Wallet integration, with support for ENS and BaseName domain resolution.

Enables Web3-focused web searches via the OptimAI External Search API, providing tools to start, retrieve, list, and cancel searches from any MCP-compatible AI host.

Provides a pay-per-query web search tool for AI agents via Lightning Network sats, enabling no-KYC, account-free searches through the MCP protocol.

MCP server that lets AI agents search the substreams.dev package registry.

Read-only MCP server for discovering and ranking on-chain agents on Stellar mainnet via natural language search, reputation probes, and profile lookups.

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

Enables agents to plan token swaps, cross-chain swaps or bridges, and native gas top-ups on six EVM chains by returning unsigned transactions for user wallets to sign. It also supports tracking transfers, resolving token addresses, and obtaining gas through a signed USDC authorization.

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.

Trace hidden insider wallet clusters behind Solana tokens before you ape — safety score, honeypot & LP-lock check, no signup for first 5 calls/day.

Enables users to compare current Aerodrome veNFT voting positions, bounded claimable rewards, and selected pools' voting evidence on Base against a saved local baseline, with retryable, atomically stored change reports. All tools are read-only on chain, requiring no keys, signing, or transactions.

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.

The CSPR.trade MCP server provides AI Agents with 14 tools for interacting with the CSPR.trade decentralized exchange on the Casper Network.

A server that enables interaction with the Solana blockchain, providing access to over 40 Solana RPC methods including getting balances, transaction details, block information, and sending transactions.

A remote MCP server that links World ID 4.0 sessions to AI assistants, enabling verified human authentication and tools for claiming Founding Human places, accessing human grants, and interacting with a verified human wall.

A Model Context Protocol server that enables Claude AI to interact with the Solana blockchain, allowing it to execute transactions, query accounts, manage wallets, get price predictions, trade tokens, and access various blockchain data sources.

Blockchain JSON-RPC on 23 EVM chains for AI agents — Ethereum, Base, Arbitrum, plus young chains like Robinhood Chain, Plasma and Ink. Free reads with no key; heavy methods (eth_getLogs, trace, debug) via a free API key or x402 USDC pay-per-call.

The open registry of AI agents. Every agent gets a free birth certificate (a number and a date) and can timestamp what it creates, or only its SHA-256, with an RFC 3161 timestamp and a Bitcoin anchor that anyone can verify without us. Free, no account.

Provides read-only access to public referral deals and codes, races and leaderboards, DeFi interface restriction data, x402 catalogs, cp0x facts, and open-source repository listings. Supports natural-language queries such as finding deals for a venue or checking interface restrictions by country.

9 tools, Lightning-gated. Pay per call. For agents that need verifiable signed actions with an audit trail. Nostr event signing via daemon Publish events to relays Create Lightning invoices Action receipts — signed proof of agent actions Identity attestation

Deep Research for crypto - free & fully local 🧠

MCP server for verifying blockchain safety on Base via x402, with free pricing/receipt tools and paid per-call guard, contract, and metadata checks settled in USDC.

A free public MCP server for Web3 data, providing live chain info, token prices, market data, wallet/token lookups, and travel search, with optional pay-per-call tools settled via x402.

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.

Identity + memory layer for AI agents on the Emercoin blockchain — read open, write via GitHub OAuth

Enables local, free crypto token research across CoinGecko, CoinMarketCap, DeFiLlama, and web search, producing structured reports with saved resources and progress tracking without requiring an API key.

Discover and rank ERC-8004 AI agents by archetype, chain, trust score, and verified on-chain performance. Free search tools + paid analytics via x402 micropayments.

Free MCP server for x402toll.com, enabling AI agents to discover and use verified, pay-per-call calculators with free previews and hash verification, supporting payments via x402 protocol on Base.

Provides read-only MCP tools for TaskMarket, enabling users to list open tasks, inspect task details, and prepare delegation drafts with approval fingerprints.

Simulates EVM transactions against forked chain state and explains why they revert, using Tenderly's free-tier API with decoded traces and source-mapped errors. Provides tools to simulate single transactions or bundles and inspect saved simulations, all with output size controls to keep responses affordable.

Enables deep cryptocurrency token research by pulling live market data, exchange listings, protocol TVL and fees from CoinGecko, CoinMarketCap and DeFiLlama alongside web searches. It assembles the results into structured, source-tracked reports covering technical fundamentals, market metrics and social sentiment, free of API keys and fully locally.

Enables querying multi-chain blockchain data (stats, blocks, transactions, addresses, node info) via Blockchair's free keyless API.

Provides multichain block-explorer data from Etherscan via MCP tools for token balances, contract ABI, and source code.

Enables local, API-key-free research on any crypto token by pulling live market data, exchange listings, and protocol metrics from CoinGecko and DeFiLlama alongside general web search. It builds structured, multi-source reports covering technical fundamentals, market data, and social sentiment, saving findings as referenceable resources while tracking research progress.

Web3 Security & Honeypot Auditor for Base & EVM chains. Free bytecode selector analysis, DEX honeypot detection, DAO proposal scanner, and LLM audits.

An official Model Context Protocol (MCP) server that provides AI agents with native, real-time access to high-value developer datasets. Currently supports SaaS/AI pricing comparisons, trending developer discussions (V2EX), and real-time Base/Arbitrum gas rates. Free Open Beta is active.

Free, no-auth MCP server for Aave, enabling AI agents to interact with Aave's DeFi protocol via a deterministic mapping of API endpoints to tools.

Bittensor subnet intelligence — mineability scores, 1-click deploy scripts, momentum scoring, whale flows, institutional tracking for all 128 subnets. 18 API endpoints. Free tier.

Agent-ready MCP server providing access to Jupiter's DeFi API, with tools mapped 1:1 to real endpoints for crypto operations. Hosted free, no auth required.

Read-only on-chain query surface for the AgentCivics civil registry on Sui — soulbound AI-agent identities, on-chain memories, reputation, refusal records. Hosted, no install, no keypair. For write tools (register, write_memory, record_refusal), install the npm package @agentcivics/mcp-server locally and supply your own keypair.

MCP Server for the Luno Cryptocurrency API