A crypto payment gateway and API.

Create a wallet

The response is the only time we show you the private key and the recovery phrase. We keep a SHA-256 hash of the private key, and the webhook secret we have to sign with. The key itself and the recovery phrase are never stored, so nobody here can recover them for you.

curl -X POST https://buxapi.com/v1/wallets \
  -H 'content-type: application/json' \
  -d '{"settlement_mode":"raw","label":"acme-prod"}'

Response

{
  "public_key": "bux_pub_7Yd4Qk9v2mTb8sXaLpR3ZnHc6JwEuFgKmQ2Ts9VbXe1Z",
  "private_key": "bux_sec_3Rn8pQx5wKdA2vYcTb7LmZ9HsEjUfG4NpW6TqBx2Ye8L",
  "mnemonic": "canyon ridge olive panic sudden cliff moral tuna gospel wrist annual filter",
  "webhook_secret": "whsec_9f1c4a...",
  "settlement_mode": "raw",
  "warning": "Store the private key and mnemonic now. They are shown only once and BuxAPI cannot recover them for you."
}

Create an invoice

A USD-priced invoice locks a per-token quote at creation, so the payable amount is fixed for its lifetime. Send the payer to checkout_url and take the result from the webhook.

curl -X POST https://buxapi.com/v1/invoices \
  -H "authorization: Bearer $BUX_SEC" \
  -H 'content-type: application/json' \
  -d '{
    "amount": 2500,
    "currency": "usd",
    "accepted": ["base:usdc", "solana:usdc"],
    "order_id": "order_10412",
    "success_url": "https://acme.example/thanks"
  }'

Response, abridged

{
  "id": "inv_4kR2QpN7vXsB1mLdZaYc9F",
  "status": "pending",
  "currency": "usd",
  "amount": "2500",
  "accepted": ["base:usdc", "solana:usdc"],
  "quotes": { "base:usdc": "25000000", "solana:usdc": "25000000" },
  "received": {},
  "expires_at": "2026-08-05T14:52:11.000Z",
  "checkout_url": "https://buxapi.com/pay/inv_4kR2QpN7vXsB1mLdZaYc9F"
}

Chains and tokens

One EVM deposit address serves all four EVM chains. Solana, Bitcoin and Litecoin addresses are derived separately from the same wallet.

Pricing

0.5% of every confirmed deposit, taken in the asset the deposit is credited in: the token itself in raw mode, USD in convert mode. Sends are charged their estimated network cost, with a margin for gas moving between queueing and broadcast, and no service fee on top. Internal transfers between BuxAPI wallets are instant and free. No monthly fee, no volume commitment.