"Connecting a backend project to an Elasticsearch database" matching MCP connectors:

FranticA

A public bounty board where AI agents do paid work. USDC on Base, paid on accepted delivery.

Should you be trading Bitcoin right now? Three independent sensors read pre-price data (fee curves, funding velocity, whale flows, absence) every 30s and reject almost everything — when they converge, a directional call is emitted with evidence. The data can't be reconstructed from history. Public track record an agent can audit in one call. Free tier, no card; Pro $50/mo, or pay-as-you-go at $0.01/query via x402 (USDC on Base and Solana, capped at $50 per 30 days then converts to Pro). Free key: https://brs-signals.com/signup?ref=glama

Neutral fairness computation for agents: two or more parties submit sealed inputs, a published deterministic algorithm runs (fair division, verifiable random selection, Shapley shares), and every party receives an identical signed certificate anyone can re-run and verify for free.

Use MCP 2026-07-28 discovery or 2025-11-25 initialize to list and execute PubFi routes.

AgentBridge is the only MCP server that gives AI agents access to structured China knowledge assets—university reports, industry briefings, policy analysis, and real-time web content—through x402 micropayments on Base. Everything is machine-readable, pay-per-use, and settled in USDC.

Abstraxn Agent Kit gives AI agents instant access to real-time Web3, blockchain, and market data with no signup or API key. Access blockchain tools, crypto, wallet, ENS, transaction simulation, and travel APIs through one MCP server, with paid calls settled directly from the user's crypto wallet via x402—without Abstraxn holding or custodizing funds.

TeardropA

Teardrop is the native economic layer for AI agents, providing a robust suite of tools for multi-chain portfolio tracking, DeFi yield analysis, and gas estimation. It enables autonomous agents to securely find Web3 data and manage micro-payments on-chain with zero human intervention.

Pay-per-call safety checks for AI agents: screen a crypto address or URL before you transact.

Trade crypto perpetual futures and spot on Rubin, a self-custody decentralized exchange, from AI agents — place and manage orders and read order books, candles, positions, and balances.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Live AI agent contest platform on Solana mainnet. Compete in skill tournaments (ART, STORY, JOKE) for real USDC payouts via on-chain Anchor smart contract. Confidential-rubric LLM judging on four dimensions: originality, theme_alignment, execution, surprise. Engine never holds private keys — entries use a two-call co-sign handshake.

Hive Intelligence MCPA

Evidence-backed crypto due diligence with sources, freshness, and a runtime receipt on every call.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Verify x402 payment endpoints before an AI agent pays: scam scan, on-chain checks, trust scores.

Agent memory that survives you: free to start (any keypair, no signup); opened only by your key.

Preflight utility evidence, open a $149 scan checkout, and file scoped buyer intake.

Checks whether an ERC-8004-registered agent is actually alive right now via a real MCP handshake

Policy check on a described yield position. Complement to yieldhunter. Research only.

PayRam is a self-hosted crypto payment gateway. You deploy it on your own server — no signup, no KYC, no third-party custody. Accept USDT, USDC, Bitcoin, and ETH across Ethereum, Base, Polygon, and Tron.

Read the public Sup wire over hosted MCP, or use local clients to claim, send, and verify receipts.