"Spaceflight API - Space Launch and Mission Data" matching MCP servers:

Free DEX aggregator API that returns executable swap calldata across 46 EVM chains. No API key required. Single GET request returns ready-to-sign transactions for any token pair.

Monero/Zcash payment webhooks + DeFi liquidation & Ethereum builder data over MCP. Free tier; x402.

MCP server for Bitcoin block explorer and mempool/fee statistics, providing tools to query fees, mempool stats, blocks, transactions, addresses, hashrate, and mining pools.

Enables AI agents to fetch live multi-chain portfolio, token info, gas prices, and token prices across Ethereum, Base, Polygon, Arbitrum, and Optimism with a single call. No API key required.

Bitcoin data for AI agents. Pay-per-query via x402 micropayments. No API keys. No subscriptions. No tokens.

55+ pay-per-call tools for AI agents over MCP: live telemetry, blockchain/on-chain checks, environmental, transit, finance, and network utilities. No API key or signup — agents pay per request with x402 USDC micropayments (Base and Solana).

Enables AI assistants to query blockchain chain data, including chain details, RPC endpoints, and chain relationships, through a Model Context Protocol server.

Eight crypto and DeFi data tools for AI agents: prices, gas, one ParaSwap route quote, GoPlus token security and top-holder samples, DefiLlama yields, Hyperliquid/dYdX funding, and observed wallet balances. Inspect prices free; pay 0.001–0.008 USDC per call on Base through x402. No API key or subscription.

Non-custodial crypto swaps for AI agents: Solana (Jupiter) + 7 EVM chains (KyberSwap), 1288+ assets, cross-chain routing, priority-fee oracle, Hyperliquid perps. Returns unsigned transactions — your wallet signs, no API key, no KYC. Hosted at https://swaptitan.net/mcp

Enables AI agents to fetch crypto market and on-chain data, including prices across venues, token facts, OHLC candles, market overview, DeFi TVL, and wallet balances, with two free tools and the rest paid per call in USDC on Base via x402.

Enables MCP-capable AI agents to access pay-per-call Solana data such as health, token prices, account balances, transactions, and trending DEX pairs, with automated x402 USDC settlement and no signup or API key required.

Enables MCP-capable AI agents to make pay-per-call Solana data requests (snapshots, risk checks, token reports, health, balances, transactions, trending pairs) with automatic USDC settlement over x402.

23 agent tools: DEX token prices, liquidity, slippage, gas and arbitrage across BNB Chain, Polygon, Arbitrum, Base, Avalanche and Optimism, plus geocoding, weather, web search, URL-to-Markdown, RSS, IP geolocation, holidays, GLEIF LEI lookup and the US Treasury yield curve. 22 are free with no API key, wallet or signup. One paid cross-DEX spread tool pays from your wallet, with hard spend caps.

MCP server for Crypto APIs Block Data product. Get block details by height or hash for EVM, UTXO, and XRP blockchains.

Signed, outcome-verified smart-money data for Polymarket: which wallets actually win, scored from real on-chain settlement (95% Wilson lower bound over resolved markets) and ed25519-signed so an agent can verify it offline. Whale trades, smart-money consensus and wallet track records, paid per call in USDC over x402, with no account and no API key.

Enables AI assistants to access AnChain.AI blockchain intelligence APIs for risk assessment, sanctions screening, and transaction analysis on blockchain addresses and transactions.

Pump.fun data fetch tool for Model Context Protocol

Enables agents to access live DeFi, social intelligence, risk, and API documentation tools with a caller-supplied API key.

MCP server for cross-chain bridging, enabling AI agents to find routes, estimate costs, check risks, execute transfers, and track status across blockchains.

Enables AI agents to query crypto data through a hosted remote endpoint: on-chain wallet and token analytics across Ethereum, BNB Chain, Base and HyperEVM, Hyperliquid perp positions and market stats, cohort-based long/short positioning, and Polymarket markets and smart-money flows. Connects via OAuth 2.1 or an API key header from Claude, Cursor, VS Code, and other MCP clients.

Made-to-order data for AI agents via x402 micropayments on Base. Describe a need in plain language, get a custom quote, pay per call. No signup, no API keys. HTTP + MCP transports. 5 tools.

43 x402-enabled API tools — DeFi, wallet security, AI/ML, developer tools, SEO. Pay-per-call USDC on Base via x402 protocol.

MCP server providing data tools for AI agents (agentkit-data-mcp).

An MCP server that enables LLMs to query DAOs, proposals, and voting data from Tally's blockchain governance API across multiple networks.

Enables MCP clients to fetch Argentine USD/ARS quotes, INDEC inflation data, and national holidays, validate CUIT/CBU identifiers, and generate Ripio wARS on-ramp links, with paid calls settled per use in wARS on Celo via x402 or free quote mode.

Premium research articles for AI agents with x402 payment on Base network.

MCP server for decoding and inspecting x402 payment headers and requests. Remote endpoint: https://lumenworks-x402-decoder.onrender.com/mcp

Enables querying public Bitcoin network data including fees, mempool status, hashrate, transactions, address stats, and Lightning network information without requiring API keys.

Enables AI assistants to access live blockchain data across multiple networks, including wallet holdings, payment verification, token prices, swaps, and scam checks.

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.

Provides counterparty risk checks for any EVM address, returning malicious-history flags, tiered risk scoring, and plain-language summaries via x402 payment.

Integrates multiple XRPL data sources including LOS, Validator History Service, XRPL JSON-RPC, and XRPLMeta to provide comprehensive querying of XRPL network data, accounts, transactions, tokens, validators, and more via MCP tools.

A fully autonomous patent data marketplace for AI agents, providing highly structured JSON datasets with strategic insights. Supports instant M2M transactions via ROSE on the Oasis Network.

NFT Data MCP provides AI agents with structured NFT collection and market data using OpenSea API v2 across 30 blockchain networks. Access floor prices, sales, trading volume, supply, holder statistics, contract addresses, and collection metadata. Built for autonomous agents and workflows, it supports x402 v2 and MPP payments on Base Mainnet at $0.002 per successful call. No subscriptions.

Enables read-only querying of orbital launch and space-sector data plus testnet event-market listings, order books, midpoint prices, and cancel-safety checks on Base Sepolia. It does not place, cancel, or claim orders, and it never resolves markets.

This MCP wraps Bitrefill public API to allow agents to search for products and shop using cryptocurrencies like Bitcoin, Ethereum, Solana, and many more.

MCP server for Crypto APIs Transactions Data. Enables lookup of transaction details by hash across EVM, UTXO, Solana, XRP, and Kaspa blockchains.

Real-time crypto, stock, and prediction-market data for agents — prices, indicators, funding rates, DeFi TVL, macro calendar, and an AI momentum score. Configure one Base wallet key and it just works. No signup, no dashboard, no subscription.

A Model Context Protocol server implementation that provides endpoints for wallet-based authentication, cluster management, and name registration services.

Lets AI agents make automated USDC micro-payments on Base mainnet via x402/MPP to unlock clean structured data from URLs and other pay-per-call tools like Markdown reading, security scans, wallet enrichment, and settlement proof, with no API key or subscription.