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The Nadcab Labs Card Issuing API lets you launch branded Visa and Mastercard cards funded with stablecoins. Your platform creates cards, tops them up from your wallet balance, and receives real-time events for every transaction.

Quickstart

Make your first API call and issue a card.

Authentication

Create an API key in the Console and sign requests.

Webhooks

Receive card, transaction and deposit events.

API reference

Every endpoint with request and response examples.

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What you can build

  • Card programs: issue virtual or physical cards on the BINs available to your account, with B2B or B2C cardholders.
  • Card controls: top up, withdraw, freeze, unfreeze, close cards and set spending limits or merchant category rules.
  • Wallet funding: get USDT and USDC deposit addresses, create sub-wallet addresses for your users and withdraw your balance.
  • Remittance: send fiat bank transfers funded from your wallet balance.

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Base URL

All requests go to:
Requests and responses use JSON unless an endpoint says otherwise. Some endpoints accept application/x-www-form-urlencoded or multipart/form-data; the API reference shows the content type for each one.