How to pay: prepare USDC in three steps

Step 1 · Pick your route

I use an exchange app

Easiest option: buy USDC directly with fiat.

Browse exchanges

I use a self-custody wallet

More control: you hold the keys, but back up your seed phrase carefully.

Wallet starter tips

Suggested exchanges & wallets

Binance

Large global exchange with deep liquidity and broad fiat rails.

Sign up (referral)

OKX (OKCoin)

Supports regional payment methods and fast C2C conversions into USDC.

Sign up (referral)

Bitget

Popular for derivatives plus spot trading, with ongoing cashback promos.

Sign up (referral)

Coinbase

Trusted in North America and Europe with quick USDC conversions.

Sign up

Step 2 · Add USDC (wallet route)

  1. Install a wallet app, then finish the backup and security checklist.
  2. Buy USDC with fiat or withdraw from your exchange into the wallet address.
  3. Confirm the network (e.g. Base or Ethereum mainnet) to avoid the wrong chain.

Step 3 · Return and complete the x402 payment

When the page responds with 402, follow the instructions, send the one-off payment, and the content unlocks automatically.