Existing website: integrate the API
Your backend saves the order, creates checkout and verifies callbacks. GitHub includes protocol examples in six server-side languages for integrating with your accounts and delivery flow.
Payment integration
USDT & USDC Payment Gateway
Accept USDT and USDC directly to your wallet with wallet checkout, exact order matching and signed webhooks. Six supported networks; TRON supports USDT only.
Supported payment networks
TRONTRC20 · USDT
EthereumERC20 · USDT / USDC
BNB Smart ChainBEP20 · USDT / USDC
Polygon PoSPOLYGON · USDT / USDC
SolanaSOLANA · USDT / USDC
BaseBASE · USDT / USDC
USDC is not supported on TRON. Routes must be enabled and have an active receiving wallet. USDbC, USDC.e and other contracts are not interchangeable with the listed assets.
Circle-issued USDC on Ethereum, Polygon, Solana and Base. BNB Smart Chain uses Binance-Peg USDC, with 18 decimals. It is not Circle-issued native USDC. Native USDC and Bridged USDT on Base mainnet. Availability depends on enabled payment routes and an active receiving wallet.
Steps to follow
From payment order to fulfillment
For SaaS, digital products, game credits and invoices. Your wallet receives funds and your application controls fulfillment.
01 Configure wallets for enabled token / network pairs and retain your private keys.
02 Save a merchant order ID, create the payment order and display checkout with the full payable amount.
03 BoltUtil checks the transfer against network, token, wallet and amount, then waits for confirmation.
04 Your server verifies the callback, checks the order, deduplicates and fulfills.
BoltUtil checks payments and sends signed callbacks. Your server verifies signatures and order status, deduplicates events, then delivers goods, activates service or credits accounts.
Integration notes
What matters before production
WooCommerce: start with the official plugin
Use the plugin in the official WordPress directory and follow its account/callback setup. Check USD store currency, HTTPS, enabled networks and receiving wallets; do not substitute the generic merchant API demo for the plugin integration.
Before launch: reconcile and fulfill once
Display the full returned amount, check the network and token version, then persist verified notifications and process once. Consult pricing and the actual checkout for fees and free-plan limits.
POST /api/v1/order/create
{
"externalOrderId": "ORDER_DEMO_001",
"amount": 199,
"currency": "USDC",
"network": "BASE",
"notifyUrl": "https://merchant.example.com/webhooks/boltutil",
"returnUrl": "https://merchant.example.com/orders/001"
}Server-side integration example only; no requests are sent. Supply the API key, timestamp and exact-body signature, and validate local orders and prices.
Read API docsPayment integration
Questions merchants ask before going live
Does BoltUtil hold the payment?
No. Customers transfer directly to your configured wallet. BoltUtil checks orders and payments without custody or access to private keys, seed phrases or withdrawal authority.
Do all networks support USDT and USDC?
TRON supports USDT only. Other networks support the configured USDT / USDC versions. Availability depends on enabled channels and merchant wallets; use the API and checkout response as the source of truth.
Can I fulfill when a customer returns?
returnUrl is navigation, not payment evidence. Use a verified callback or trusted server-side status query, check the order and fulfill once.
How are payment differences handled?
Free merchants can view their own review records. Qualifying manual-transfer differences can create review records; verify ownership when several orders are candidates. Active membership is required to accept or reject an association. Acceptance confirms payment and triggers the configured callback.
Can customers connect a wallet without entering the amount?
Yes. Wallet checkout prepares the recipient, token and complete payable amount on supported networks and devices. Customers review and confirm in their wallet. First use may require unlocking, connection approval or a network switch. QR codes and copied addresses remain available for manual transfer; both methods require on-chain confirmation.
Launch a cleaner USDT / USDC payment flow
Create orders, monitor transfers, and notify your backend without asking customers to send screenshots.