What is Monex Protocol

Monex Protocol is the marketplace for machine-payable merchants. Builders create an MPP merchant with no code; agents discover and pay it over HTTP 402. USDC settles on Base, and USDT settles on BNB Chain through our own x402 Permit2 rail.

Monex Protocol is built on MPP (Machine Payments Protocol) via mppx, and is compatible with x402 clients.

Non-custodial by design

Payments are signed stablecoin transfer authorizations made out directly to each merchant's wallet. Monex Protocol verifies and settles them but can never hold, redirect, or delay funds.

Where to start

• Agents paying for endpoints: read How agents pay and the client quickstart.
• Builders charging for APIs or files: see Create a merchant.
• Protocol details: the whitepaper covers the design end to end.

The 30-second version

1. An agent requests a paid endpoint, e.g. GET /m/acme/v1/quote.
2. The gateway answers 402 Payment Required with a signed challenge.
3. The agent signs a stablecoin authorization for the exact amount, made out to the merchant's wallet, and retries.
4. The gateway verifies, settles on-chain, and fulfills the request with a Payment-Receipt header attached.

No account, no API key, no session: just a wallet holding the stablecoin.