// PAYMENTS INFRASTRUCTURE · X402 PROTOCOL

The payment rail for autonomous agents.

Non-custodial by design. 1% flat — 0.5% at volume — invoiced monthly, never skimmed. USDC settles straight to your wallet on Base. We never touch funds.

$ get_started read_docs →

bma — x402 handshake

Terminal demo: an agent requests a paid endpoint, receives 402 Payment Required with an x402 quote of 0.10 USDC, signs the payment with viem, retries with an X-PAYMENT header, and gets 200 OK — settled on Base.

SETTLEMENT FEED · SIMULATED

A simulated feed of example USDC settlements on Base.

0x8f…2e1 → 0.10 USDC · base ✓0x1a…9c4 → 12.00 USDC · base ✓agent-7f31 → 0.02 USDC · base ✓0x64…b78 → 1.50 USDC · base ✓agent-c09 → 0.25 USDC · base ✓0x3d…f52 → 3.20 USDC · base ✓agent-88a2 → 0.05 USDC · base ✓0x9b…041 → 0.40 USDC · base ✓0x8f…2e1 → 0.10 USDC · base ✓0x1a…9c4 → 12.00 USDC · base ✓agent-7f31 → 0.02 USDC · base ✓0x64…b78 → 1.50 USDC · base ✓agent-c09 → 0.25 USDC · base ✓0x3d…f52 → 3.20 USDC · base ✓agent-88a2 → 0.05 USDC · base ✓0x9b…041 → 0.40 USDC · base ✓

01 — THE X402 PROTOCOL

How agents pay over HTTP

x402 puts HTTP's reserved 402 status code to work: any endpoint can quote a price, and any agent can pay it — machine to machine, no accounts, no checkout pages, no human in the loop.

GET /v1/report

Agent requests a resource

Any HTTP endpoint can be priced — an API route, a dataset, a tool call.

402 PAYMENT REQUIRED

Server quotes a price

The response carries the amount, asset, and pay-to address: 0.10 USDC.

X-PAYMENT

Agent signs and retries

The payment is signed with any viem signer — no account, no card on file.

200 OK

Settled on-chain

USDC lands in your wallet on Base. The 1% fee is invoiced monthly.

02 — SPECIFICATIONS

Built for agents, spec by spec

TRANSACTION FEE

1.00% → 0.50% at volume · invoiced monthly, never skimmed

CUSTODY

None. every payment settles directly to your own wallet — we never hold your funds, and the 1% fee is recorded and invoiced monthly, not deducted from your transactions

SETTLEMENT

USDC on Base · Base Sepolia for testing

PAYMENT TYPES

One-off · Subscriptions · Links renewal links sent automatically · the buyer approves each one

INTERFACES

REST + GraphQL SDKs for React, Vue, Web Components, Python · Express + Next.js wrappers to charge for your own API

PAYMENT SCHEME

exact a fixed price per endpoint — the only scheme in x402 v1, which is what we settle

SECURITY

Designed to SOC 2 Type II · ISO 27001 TLS 1.3, encrypted at rest, hashed API keys, audit logging — see Compliance

ANALYTICS

Built in payments, transactions, and fee reporting in your dashboard

03 — PRICING

1% flat. Not 2.9% + $0.30.

At agent-scale micropayments, card rails' fixed fees dominate. Run your own numbers:

MONTHLY VOLUME$50,000

AVERAGE TRANSACTION$5.00

10,000 transactions / month · card-rail math: 2.9% + $0.30 each

BillMyAgent · 1%$500

as low as $250 at the 0.5% volume rate

Card processors · 2.9% + 30¢$4,450

an effective 8.9% rate at this transaction size

You keep$3,950 / month

04 — PAYMENT LINKS

Get paid in one call

No integration required to send your first link — try it on the right.

Create

One API call returns a hosted checkout link.

Send it anywhere — chat, invoice, or agent to agent.

Get paid

Your buyer pays from any wallet; USDC lands directly in yours.

CREATE A PAYMENT LINKSIMULATED · NO FUNDS MOVE

AMOUNT

USDC

NETWORK

POST /api/v1/payment-intents

Availability varies by region — see Terms

05 — SHIP IT

Ready to ship agent payments?

Join developers building the future of AI agent payments.

$ create_account get_api_key read_docs →