Introduction

Stablezact accepts stablecoin payments and settles them to wallets you control. Customers pay in USDC or USDT on any supported chain; you receive the funds without holding the payment flow yourself.

Two ways in

Most integrations should use the SDK. Reach for the API when you cannot run our UI: a server-to-server flow, a native app, or a platform whose checkout you do not control.

	SDK	API
You provide	a mount point	the entire payment UI
Wallet connection	handled	yours to build
Chain switching	handled	yours to build
Balance checks before submit	handled	yours to build
Works without a browser	no	yes

The SDK is a wrapper around the same API. Nothing it does is unavailable to you directly, so starting with the SDK does not close the API path later.

Supported chains

Eleven chains carry deposit-address payments: Base, BSC, Arbitrum, Polygon, Optimism, Avalanche, Monad, Linea, zkSync Era, Scroll and Unichain. Solana is supported for direct payments.

You will only be able to accept payments on a chain you have configured a settlement wallet for. Creating a payment on a chain without one is rejected, with an error naming the chain.

Before you start

You need a merchant account and a public key, which looks like pk_ followed by a hex string. It identifies your account on every request and is safe to ship in a browser bundle, because it cannot move money on its own.

X-Public-Key: pk_your_public_key
Content-Type: application/json

Production is https://hub.stablezact.com.