Top up once. Call any endpoint.

Accepted

• Any EVM address (0x + 40 hex characters, 42 characters total)
• Self-custody wallets: MetaMask, Coinbase Wallet, Rabby, Trust Wallet, Rainbow, Ledger / Trezor
• Smart-contract wallets such as Safe (as long as the address is on an EVM chain)
• Ideally the same address your agent uses for x402 payments (USDC or USDT on Base)

Not accepted

• Bitcoin (bc1…, 1…, 3…), Solana, Tron (T…) or other non-EVM addresses
• ENS names (vitalik.eth) — enter the resolved 0x address instead
• Exchange deposit addresses (Binance, Coinbase.com, …) — they cannot sign x402 payments later

Option A — With a crypto wallet

1. Choose “I have a crypto wallet” below.
2. Paste your EVM wallet address (0x…). Your credit and API key are tied to this address.
3. Pick an amount ($5–$500) and optionally add an email for the receipt.
4. Click “Pay with card” and complete the secure Stripe checkout.
5. Back on this page, copy your API key — it is shown right after payment.
6. Send the key as X-API-KEY header with every request (see example below).

Option B — Without any wallet (card only)

1. Choose “No wallet — card only” below.
2. Enter your email address (required — it identifies your account and receives the receipt).
3. Pick an amount ($5–$500) and click “Pay with card”.
4. After payment you receive an Account ID (0x…) and an API key. Store both safely.
5. Send the key as X-API-KEY header with every request — no crypto, no wallet involved.
6. To top up later, choose “I have a crypto wallet” and paste your Account ID as address.