"Free APIs and services without commercial fees" 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.

Provides Solana priority fee estimates at 6 levels for transactions, with pay-per-call micropayments via x402.

MCP server for Chainlink Runtime Environment, enabling build, simulate, deploy, and manage CRE workflows from any MCP client.

Provides real-time Bitcoin on-chain data including Bitmap districts, Ordinals inscriptions, Runes, sat rarity, block details, and current fees via the Model Context Protocol, with zero configuration required.

An MCP server that exposes the satring.com L402 service directory, enabling AI agents to search and query Lightning-paywalled and stablecoin-gated APIs without needing prior knowledge of their URLs.

MCP server for ThryxProtocol on Base, enabling AI agents to launch ERC-20 tokens, trade on bonding curves or Uniswap V4 pools, claim fees, and discover tokens through 21 native tools with gasless transactions.

Provides access to Tatum's blockchain API across 40+ networks, enabling developers to interact with blockchain data, manage notifications, estimate fees, access RPC nodes, and work with smart contracts through natural language.

Enables natural language queries and JSON-RPC calls to 69+ blockchain networks through Grove's free public endpoints. Supports Ethereum, Solana, Cosmos chains, and Layer 2 solutions without requiring authentication or API keys.

Connects AI agents to decentralized, community-built APIs on Solana, enabling autonomous discovery, payment, and execution of tools without subscriptions or API keys.

Connects AI agents to 2,800+ APIs via x402 micropayments on Base, enabling automated API calls for $0.01 each without signup or API keys.

Provides Solana RPC tools for agents to check health, estimate priority fees, sample Yellowstone gRPC, and submit signed transactions via the rpc edge relay.

MCP server for the SEXAI network, enabling agents to browse, publish themselves, and breed with other agents to spawn new ones. Supports skills, MCPs, and soul composition with optional fees and on-chain identity.

Evaluator-as-a-service for autonomous AI agents implementing ERC-8183/Virtuals ACP v2.0. Agents submit jobs for scoring across three tiers, settle fees in USDC on multiple chains, and receive attestations.

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.

Query blockchains with plain English — instant, structured, and developer-friendly using Infura APIs

The Tollbooth Authority MCP server registers Lightning payment operators, collects certification fees, and issues Schnorr-signed Nostr certificates to certify toll booth operators in the Tollbooth ecosystem.

Provides tools for AI assistants to query the Canton Network for data on contracts, governance, validators, and party transactions through the Lighthouse Explorer API. It enables seamless interaction with blockchain statistics, price history, and name services without requiring an API key.

Enables interaction with the Algorand blockchain through 25+ specialized tools for account management, payments, asset creation, NFT operations, and network monitoring. Supports both mainnet and testnet with instant finality and low fees.

Provides 46 MCP tools to interact with the Bags.fm platform, allowing AI agents to launch coins, trade, claim fees, and scout trends on Solana.

Hosted MCP server for Aarna, providing deterministic tool mappings to Aarna's API endpoints for AI agents to interact with DeFi and crypto services without authentication.