Developer API · Beta

Payments on
blockchain.

Integrate USDT transfers, cross-border payments, and CAW token features into any app — with a single REST API. Billed in USDT, on-chain.

Get API Key View Pricing
Why CAW CASH API

Built for the
borderless economy

Everything you need to accept and send crypto payments, without the complexity.

01
Instant Settlement
Payments confirm on Ethereum in seconds. No bank delays, no chargebacks, no holds.
02
Cross-Border Native
Send USDT to any wallet address globally. No FX fees, no correspondent banks required.
03
Non-Custodial
Funds flow directly to recipient wallets. We never custody your assets.
04
On-Chain Billing
API subscriptions are paid in USDT. Verified on Ethereum, no credit card needed.
05
REST + Webhooks
Standard REST endpoints with JSON. Webhooks for real-time payment notifications.
06
AI-Powered
Natural language payment routing. "Send 50 USDT to @handle" — parsed and executed.
E-Commerce

Payment Links,
built for the web

Generate a payment URL in one API call. Customer opens the link, pays USDT, you get notified via webhook. No UI to build.

01
Create Link
POST with amount + description. Get back a payment URL instantly.
02
Customer Pays
Share the URL. Customer sees QR code and sends USDT directly to your wallet.
03
Webhook Fires
On confirmation, your endpoint receives payment.completed with tx hash.
04
Done
Funds land directly in your wallet. No intermediary, no settlement delay.
POST
/api/payment/link
Create a payment link. Returns {id, url, amount_usdt, expires_at}
GET
/api/payment/link/:id
Check payment status — pending / paid / expired
POST
/api/payment/link/:id/confirm
Mark as paid with tx hash. Fires webhook with X-CAW-Signature header.
GET
/api/payment/links
List all your payment links. Filter by ?status=pending|paid|expired|cancelled
DELETE
/api/payment/link/:id
Cancel a pending link. Cannot cancel already-paid links.
Try it — generate your code
① Create
② Status
③ List
④ Cancel
⑤ Webhook
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Pricing

Simple, transparent

Paid plans billed monthly in USDT on Ethereum. Free plan available forever.

Free
$0/mo
1,000 API calls / month
  • Price & balance queries
  • Payment request creation
  • CAW token data
  • Community support
Popular
Starter
$9 USDT/mo
50,000 API calls / month
  • Everything in Free
  • Send & Swap API
  • Webhook notifications
  • Email support
Pro
$49 USDT/mo
Unlimited calls / month
  • Everything in Starter
  • Batch payments API
  • Priority support
  • Custom rate limits