"How to write a query in Elasticsearch" 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.

Cross-chain cryptocurrency swaps via Chainflip. Get quotes, execute swaps, and track progress. No API key required to get started.

Generates MCP servers from smart contract ABIs, enabling Claude to interact with any Ethereum contract via natural language commands.

Teaches AI coding agents how to reason correctly about MetaMask Embedded Wallets / Web3Auth architecture, SDK choice, key derivation, auth flows, and common integration pitfalls.

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.

Read-only access to the live NOVAI blockchain (an AI-native L1) over public JSON-RPC. Query blocks, transactions, AI entities, on-chain signals, oracle anchors, and memory objects. No keys, no write paths.

MCP server for Bags on Solana. Reads token analytics, creator-fee data and trade quotes; executes swaps and fee claims only behind a token gate, a hard SOL spend cap, and a single-use confirmation token bound to the exact arguments. The first call to a write tool signs nothing — it returns a preview. 14 tools, 337 tests at 100% coverage enforced in CI, mainnet-only writes, npm provenance.

Enables agents to read and write technocore.chat messages with a did:key identity, including end-to-end encrypted rooms, via 14 tools over stdio.

An Omni-Agent MCP server that provides Khmer cultural context and Web3 blockchain query tools, with security and routing built in.

Production MCP server giving AI agents metered access to live Hedera blockchain data. Query token prices, screen identities, monitor governance, write tamper-evident HCS compliance records, and analyze smart contracts — all paid in HBAR micropayments per call.

Enables AI agents to read chain data, execute transactions, swap tokens, and manage wallets on Solana through 38 tools across 7 modules. Supports write operations with a private key and includes built-in prompts for common workflows.

Enables AI agents to create and manage self-custodial ERC-4626 vaults holding a rebalanced basket of tokenized US stocks (NVDA, META, AAPL, GOOGL) on Base, with tools to quote, buy, sell, rebalance, redeem in USDC or in-kind, and transfer shares. Also provides USDC bridging between Base and Arc, gas sponsorship payable in USDC, and x402 payment utilities, with every write returned as unsigned calldata the agent signs itself.

A minimal demo of the x402 payment protocol protecting an MCP tool endpoint, showing how to charge for MCP tools using real 402 rejections and testnet payments.

Enables Claude to increment and query a counter deployed on the Linera blockchain via natural language, using an Apollo MCP server bridge.

mcp server that allows to do actual actions related to solana first version adds knowledge about RPC methods and how to call them

Listens to Monad testnet for new blocks and provides a REST API to query the latest block number and transaction count.

Enables AI agents to query live on-chain data from The Graph's decentralized network with built-in verification and computed risk insights for Uniswap V3 pools, such as swap counts, directional flow, and concentration signals.

Exposes OriginTrail DKG V10 working, shared, and verifiable memory as standard MCP tools, enabling users to read, write, share, and query DKG memory from any MCP-capable client without custom HTTP wiring.

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.