"React Query" matching MCP servers:

Exposes Base mainnet chain query tools over MCP, letting clients fetch an address's native balance and current gas fee estimates (slow/standard/fast urgency) from an upstream HTTP API. Paid tools are gated by x402 micropayments settled through the CDP facilitator, with a free health check and a documented free-trial allotment.

A Model Context Protocol server providing tools for querying Bitcoin blockchain data via Blockchain Data and Query APIs, supporting various BTC information retrieval functions.

Provides live cross-DEX market data on six EVM chains, including per-venue prices, liquidity, and gross spreads with optimal trade sizes. Enables AI agents to query real on-chain data for BSC, Polygon, Arbitrum, Base, Avalanche, and Optimism via MCP tools.

Enables assistants to query Solana DEX and Pump.fun data through typed tools, including token prices, metadata, trades, creations, graduations, and bounded live stream tails.

PayQL is an MCP server that lets any AI agent query The Graph and pay per query in USDC — gasless, keyless, bring-your-own-wallet.

Provides MCP tools to query Etherscan for Ethereum blockchain data—ETH balances, ERC-20 tokens, transactions, contract ABIs, and gas prices—without requiring an API key.

Provides cross-chain bridge and swap tools for AI agents using the Relay Protocol to interact with multiple blockchain networks. It enables agents to query supported chains, obtain transaction quotes, and generate unsigned transaction data for token transfers and swaps.

Thin MCP wrapper around the SQD Portal API for blockchain data queries across multiple networks including EVM, Solana, Bitcoin, Substrate, and Hyperliquid. Provides 25 public tools for discovery, cross-chain queries, and chain-specific operations.

An MCP server that exposes the Zapper DeFi portfolio API, enabling LLMs to query wallet balances, token holdings, and DeFi positions using natural language.

An MCP server that enables AI agents to query the Canton Network for balances, rewards, classified transactions, CC prices, and directory information using natural language.

Enables MCP-compatible agents to query Robinhood Chain market data (new pairs, wallet intel, risk scans, equities dislocation) and build unsigned swap routes via the Seranox metered API.

Enables AI assistants to query blockchain data across 30+ networks via Infura, using natural language for blocks, transactions, contracts, and more.

Enables AI agents to query blockchain data across EVM chains and Sui through token-efficient MCP tools, including balances, transactions, logs, NFTs, token prices, and Sui objects/events, with optional TORPC tiered ABI decoding.

MCP server for tracking crypto transactions (trades, swaps, transfers) with exact Decimal precision, allowing LLM agents to log and query historical records with JSON or Notion persistence.

Query recent blockchain address data (last 14 days) for EVM, UTXO, Solana, XRP, and Kaspa networks without requiring address sync.

Enables AI agents to query Keel's Stellar liquidity risk engine for executable order-book and AMM depth, maximum safe collateral sizes, asset risk bands, flags, and historical readings, with ledger and methodology provenance on every answer. All tools are read-only, so agents can assess collateral and trade depth without signing or submitting transactions.

MCP server for Deribit's crypto options exchange, enabling AI assistants to query market data, manage accounts and orders, and execute trades with safety defaults (testnet, trading disabled by default).

A read-only Solana MCP server that lets AI assistants query SOL prices, wallet balances, SPL token holdings, and recent transactions on the Solana mainnet via natural language over stdio.

A read-only MCP server that lets Claude query Polymarket's public APIs for markets, events, live order books, price history, trades, open interest, trader leaderboards, and wallet positions and P&L. It also offers arbitrage scanning, market "x-ray" reports, calibration scoring, daily digests, and a local simulated paper-trading ledger — with no keys, no signer, and no real orders ever placed.

Enables agents to query Solana and Pump.fun token intelligence, including coordinated wallets, holder quality, KOL positions, wallet reputation, deployer history, and ratings, with per-call USDC payments over x402 or a Pro key.