"Ray" matching MCP servers:

Enables AI agents to discover and pay for x402-gated HTTP APIs, handling 402 Payment Required flows with local signing. Supports EVM and Solana with non-custodial wallet management.

MCP server that lets AI agents discover and pay for .agent services using USDC over x402, with daily budget controls and payment link creation.

Enables AI agents to create cryptocurrency payments, check payment status, generate QR codes, and manage transactions through Bitnovo Pay API integration with automatic webhook support.

An MCP server for USDC payments on Base, enabling AI agents to check balances, send payments, generate payment requests, and view transaction history.

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.

Self-custodied Nano wallet + x402 payment client and merchant server for AI agents, enabling micropayments, on-ledger settlement, and paid endpoints.

Enables AI agents to send and receive USDC stablecoin payments on Base and Solana blockchains through MCP tools for wallet operations, balance checks, payment requests, and transfers.

Non-custodial payment engine for AI agents supporting BTC, ETH, USDT, USDC, XRP, XMR, and ZEC. Exposes wallet, invoice, and payment tools over MCP with per-agent spend limits, plus x402 pay-per-call support.

Trust-aware Nostr MCP server. 236 tools for identity, social, DMs, trust scoring, AI-to-AI dispatch, Lightning payments, privacy proofs, and encrypted vaults. NIP-46 bunker auth; keys never leave the signing device.

Enables an AI agent to settle HTTP 402-gated resources end-to-end: quote conversions, choose from the seller's accepted rails, sign gasless EIP-712 authorizations under enforced per-call and lifetime caps, and verify settlement receipts while tracking wallet balance. Runs self-hosted over stdio or Streamable HTTP, defaulting to testnet with mainnet requiring explicit confirmation.

Local-first Sui review and evidence layer for AI clients. It enables users to review and approve Sui transactions in their own wallet after AI requests, without the AI having signing authority.

Measured trading-venue tolls (fee, spread, slippage) with per-venue freshness and evidence. list_venues is free; get_toll costs $0.05 USDC on Base via x402.