m2m.monster

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "m2m.monster": {
      "url": "https://api.m2m.monster/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (10)

• get_pricing read-only

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

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• 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.

  Parameters:

  • network (required) — string — CAIP-2 network id, e.g. solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1
  • mint (required) — string — Payment token mint (exact whitelisted address)
  • amount (required) — string — Integer amount in base units of the mint
  • payee (required) — string — Wallet that receives the payment
  • idempotency_key — string — Reuse the same key when retrying

  Hints: read-only no · destructive not declared · idempotent not declared · open-world no

• build_payment read-only

  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.

  Parameters:

  • quote (required) — object — The signed quote exactly as returned by quote_payment
  • payer (required) — string — The payer wallet; it signs and pays the network fee
  • max_compute_unit_price — string — Lower priority fee cap in micro-lamports per compute unit

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• verify_payment read-only

  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.

  Parameters:

  • quote (required) — object — The signed quote exactly as returned by quote_payment
  • transaction (required) — string — Base64 wire transaction

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• 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.

  Parameters:

  • quote (required) — object — The signed quote exactly as returned by quote_payment
  • transaction (required) — string — Base64 transaction signed by the payer
  • idempotency_key (required) — string

  Hints: read-only no · destructive no · idempotent not declared · open-world yes

• verify_receipt read-only

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

  Parameters:

  • receipt (required) — string — Receipt JWS

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• build_refund read-only

  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.

  Parameters:

  • receipt (required) — string — Receipt JWS of the original payment
  • amount (required) — string — Refund amount, at most the original gross amount

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• 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.

  Parameters:

  • solana_pubkey (required) — string — Base58 Solana public key
  • agent_id — string
  • signature — string — Base58 ed25519 signature of the message
  • referred_by — string — Pubkey of the agent that referred you
  • capabilities — array

  Hints: read-only no · destructive not declared · idempotent not declared · open-world no

• get_referral_status read-only

  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.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• get_status read-only

  Service status and API version.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

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