Andreax — pay-per-call AI tools for agents (MCP + x402)

Remote MCP server: https://pagos.andreax.dev/mcp (Streamable HTTP, JSON-RPC)

Andreax is a remote MCP server with 270 pay-per-call tools for AI agents — text, code, documents, audio, web research and on-chain data. There is no signup and no API key: each call is paid individually with x402 in USDC on Base, from $0.001 per call.

• No accounts, no keys. The payment is the authentication.
• Gasless for the payer. EIP-3009 transferWithAuthorization; the settlement gas is paid by Andreax.
• Free preview. Every tool accepts ?sample=1 and returns an example output at no cost.
• Discovery in one request. GET https://pagos.andreax.dev/.well-known/x402.json

This repository only contains the public listing (README + directory metadata). The server itself is hosted; there is nothing to install.

Connect

Claude Desktop / Cursor / any MCP client (via mcp-remote)

{
  "mcpServers": {
    "andreax": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://pagos.andreax.dev/mcp"]
    }
  }
}

Clients with native remote-MCP support

Add a remote server with URL https://pagos.andreax.dev/mcp (transport: Streamable HTTP, auth: none).

JavaScript SDK (handles the x402 payment for you)

npm install @andreax-tools/sdk

How payment works

1. tools/list is free.
2. tools/call without payment returns an x402 v2 challenge: exact amount, network (eip155:8453), asset (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) and recipient.
3. Your agent signs an EIP-3009 authorization for that amount and retries with it (argument x_payment, or the X-PAYMENT header over HTTP).
4. The result comes back together with the on-chain settlement reference.

Your agent only needs a wallet with a little USDC on Base — no ETH.

Tools (a selection of the most used — tools/list returns all 270)

The live catalog (with the current prices, which are authoritative) is at https://pagos.andreax.dev/api/taller/peaje/catalogo.

Links

• Storefront: https://pagos.andreax.dev/tienda
• x402 discovery: https://pagos.andreax.dev/.well-known/x402.json