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X402 Agent Example MCP Server

Developer ToolsLow Risk10.0MCP RegistryRemote
Free

Server data from the Official MCP Registry

Pay-per-call AI gateway: models, speech, web search, on-chain reads and NLP tools, via x402.

About

Pay-per-call AI gateway: models, speech, web search, on-chain reads and NLP tools, via x402.

Remote endpoints: streamable-http: https://agents.dexl.io/mcp

Security Report

10.0
Low Risk10.0Low Risk

Valid MCP server (1 strong, 0 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.

5 tools verified · Open access · 1 issue found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

Check that this permission is expected for this type of plugin.

How to Connect

Remote Plugin

No local installation needed. Your AI client connects to the remote endpoint directly.

Add this to your MCP configuration to connect:

{
  "mcpServers": {
    "io-github-dexl-io-agents": {
      "url": "https://agents.dexl.io/mcp"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

Pay an API with x402 — in about ten lines

x402 is HTTP 402 put to work: a server answers 402 Payment Required with the exact price, the client signs a stablecoin payment and repeats the same request. No account, no API key, no invoice.

These examples call DexL Agents, an x402 gateway (chat models, speech, web search and crawl, on-chain reads, FX rates, NLP tools). Everything here works against any x402 server — only the URL changes.

1. Free: no wallet at all

npm install
npm run free

free.mjs does two things:

  • calls the free tier (model: "dexl-free") — no payment header, no wallet, no account;
  • asks what a paid call would cost by sending it without payment and reading the 402.

Real output:

free answer: HTTP 402 (Payment Required) is a non-standardized status code reserved for future use...
web-search costs 0.01 USDC on eip155:8453 (HTTP 402)

2. Paid: one call, one signature

PRIVATE_KEY=0x... npm run paid

The payment is these three lines; after them it is ordinary fetch:

const signer = toClientEvmSigner(wallet);
const client = new x402Client().register('eip155:8453', new ExactEvmScheme(signer));
const fetchWithPay = wrapFetchWithPayment(fetch, client);

Your key stays on your machine — the server only ever sees a signed payment. Settles in USDC on Base, Polygon, Arbitrum or Solana. Error responses are not charged.

The free example above was run as-is. The paid one needs your own funded wallet, so run it yourself with a small balance; it uses the same client our own service uses.

3. Connect an MCP client

Remote (free tools only — a remote server holds no wallet of yours):

https://agents.dexl.io/mcp

Local, with paid tools, because the wallet stays on your machine:

{
  "mcpServers": {
    "dexl": {
      "command": "npx",
      "args": ["-y", "dexl-agents", "mcp"],
      "env": { "DEXL_BASE_URL": "https://agents.dexl.io", "DEXL_PRIVATE_KEY": "<optional>" }
    }
  }
}

What you can call

GET /v1/tools lists every tool with its price and schema. Machine-readable: /llms.txt · /openapi.json · /.well-known/x402 · /.well-known/mcp

MIT licensed. Issues and pull requests welcome.

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