m2m.monster MCP Server

by m2m Your server? Claim it

answering

m2m.monster is answering right now. Last checked 9 min ago. It exposes 10 tools.

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

Uptime history 12 days of history · worst day 99%

12 days agonow

100.0%

Uptime 24h

182 of 182 checks

Tools

read from the server

257 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check m2m.monster every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

Settings → Connectors → Add custom connector, then paste this address

https://sandbox.m2m.monster/mcp

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 10

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

build

build_payment

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. Sign it locally with your own Solana key; m2m.monster never sees or uses agents' private keys.

build_refund

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.

verify

verify_payment

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

Verify a receipt: the m2m.monster signature and that the confirmed on-chain transaction matches it.

pricing

get_pricing

Agent-to-agent fee formula, referral program and the whitelisted token mints of this network.

quote

quote_payment

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.

referral

get_referral_status

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.

register_agent

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.

status

get_status

Service status and API version.

submit

submit_payment

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.

Endpoints

URL	Transport	State	Latency	Checked
https://sandbox.m2m.monster/mcp	streamable-http	answering	244 ms	9 min ago
https://api.m2m.monster/mcp	streamable-http	answering	212 ms	9 min ago

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1 tools answering

m2m.monster — questions

Answers built from our own checks of this server.

What can m2m.monster do?

It exposes 10 tools, read directly from the server on our last check. Among them: build_payment, build_refund, get_pricing, get_referral_status, get_status, quote_payment and 4 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is m2m.monster mostly used for?

Its tools cluster around build and verify. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is m2m.monster working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 182 of 182 checks got a reply (100.0%), average response time 257 ms. The bar chart above shows every period we have measured.

How do I connect m2m.monster?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does m2m.monster need an API key?

No. m2m.monster completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 10 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is m2m.monster?

It answers our handshake in 257 ms on average, which is faster than 65% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.