Built for the way payments actually work.
coinkraft.io takes the proven shape of a modern payments API — idempotency keys, signed webhooks, server-sent events — and applies it to crypto.
8 currencies, 4 chains
Native BTC + LTC. ETH + ERC-20 USDT/USDC. TRX + TRC-20 USDT/USDC.
Hosted invoices
Brand-customizable hosted payment page with QR codes, wallet deeplinks, real-time SSE status and a five-stage animated state machine.
HMAC-signed webhooks
Every callback is signed (t=…, v1=…) so you can verify provenance. Retried until your endpoint returns *ok* — exponential backoff with jitter.
Idempotent POSTs
Send the same Idempotency-Key twice and we'll replay the cached response. No more duplicate invoices from flaky networks.
Non-custodial-ish
Funds touch our forwarding address only briefly. Configure auto-forward, splits across up to 255 destinations, and scheduled sweeps.
Real-time everywhere
Server-Sent Events stream invoice updates to the hosted page and the dashboard. No polling.
A REST API that fits in your head.
Create an invoice in five lines. Receive a signed webhook the moment it's paid. Redirect the customer back to your store.
POST /api/v2/accounts/.../invoices
curl https://api.coinkraft.io/api/v2/accounts/apr-…/invoices \
-H 'authorization: Bearer ACCESS' \
-H 'idempotency-key: order-1845' \
-d '{
"currency": "btc",
"amount": "450000",
"linkback": "https://shop.example.com/thanks",
"callback-url": "https://shop.example.com/api/hooks/coinkraft",
"user-data": { "title": "Order #1845" }
}'Pricing that picks itself.
On every payment we charge the lower of 1% or a flat per-transaction fee — automatically. No plan to choose, nothing to switch.
$25,000
$120
Settlement coin
Flat fee depends on the coin you settle in.
Projected monthly cost
$249.6
208 tx × $1.20 — your smart fee
1% per tx
$1.2
✓ Applied · lower
Flat · BTC
$30
The lower fee is applied automatically on every transaction — capped at the flat fee, never both. Incoming payments are always free.