MCP server

m2m.monster Official

monster.m2m/m2m-monster

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Non-custodial x402 payments between AI agents on Solana. Returns unsigned transactions.

Website

At a glance

Type

MCP server

Publisher

m2m.monster (verified by the MCP Registry)

Status

Working at last check

Tools

10

Token cost

About 1,624 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http m2m-monster https://api.m2m.monster/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.m2m-monster]
url = "https://api.m2m.monster/mcp"

Gemini CLI

{"mcpServers":{"m2m-monster":{"httpUrl":"https://api.m2m.monster/mcp"}}}

Cursor

{"mcpServers":{"m2m-monster":{"url":"https://api.m2m.monster/mcp"}}}

VS Code

{"servers":{"m2m-monster":{"type":"http","url":"https://api.m2m.monster/mcp"}}}

Antigravity

agy mcp add m2m-monster https://api.m2m.monster/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"m2m-monster","server_url":"https://api.m2m.monster/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"m2m-monster","server_url":"https://api.m2m.monster/mcp"}

Tools

• build_payment ~280 tokens
  Build the m2m-split transaction for a quote: the payer's transfer to the payee and the USDC fee transfer to the treasury, in one atomic transaction where the payer pays its own gas. Checks that the receiving token accounts exist and that the payer holds USDC for the fee, and simulates it. Unsigned.
• build_refund Moves money · ~191 tokens
  Build a refund from the payee back to the payer, linked to the original receipt. The payee signs it and pays its gas; it has no m2m.monster fee and the original fee is not returned. Unsigned. Sign it locally with your own Solana key; m2m.monster never sees or uses agents' private keys.
• get_pricing ~52 tokens
  Agent-to-agent fee formula, referral program and the whitelisted token mints of this network.
• get_referral_status ~73 tokens
  Your referrer, referred agents, credits and their expiry dates. Credits are discounts on your own fees, never cash. Requires the api_key from register_agent.
• get_status ~34 tokens
  Service status and API version.
• quote_payment ~258 tokens
  Price a payment to a payee: gross amount, net amount to the payee, fee_gross, discount, fee_net, treasury, mint and a 30-second expiry. Returns a signed quote.
• register_agent ~250 tokens
  Optional registration; paying and getting paid work without it. It unlocks referral credits and receipt history. Call once without `signature` to get the message to sign with your Solana key, then again with the base58 signature to receive an api_key.
• submit_payment Moves money · ~215 tokens
  Broadcast a transaction the payer already signed, wait for confirmation and return the signed receipt. Only broadcasts; never signs or pays payment transactions. A retry with the same idempotency_key never pays twice.
• verify_payment ~175 tokens
  For the payee: check a payer-signed transaction against its quote (net amount, fee to the treasury, whitelisted mints, quote id and expiry) and simulate it before submitting.
• verify_receipt ~96 tokens
  Verify a receipt: the m2m.monster signature and that the confirmed on-chain transaction matches it.

Browse

• Payments
• Crypto and blockchains

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