Flexrix Pay
Crypto payments, settled.
One API to accept stablecoins and crypto, pay out to anyone and reconcile every cent.
Products
Everything between “pay” and “paid”
Payment links
Price in USD, EUR, TRY and 9 more currencies. The rate locks when the link is created; share it by WhatsApp, Telegram or email — no code needed.
49.90 USDT
≈ €46.12 · ORD-261041
Deposit addresses
A permanent address for every customer on every network. Top-ups are detected, screened and credited automatically.
Payouts with approvals
Send from the dashboard or API. Require approval above an amount, two-person sign-off, daily limits and allowlisted destinations.
2,500 USDT · API
Automatic transfers
When a balance reaches your threshold, it moves to your own wallet by itself — minus the amount you choose to keep.
Hosted checkout
Mobile-first, 7 languages, one tap from MetaMask, Trust Wallet, Phantom, TronLink or 500+ wallets via WalletConnect.
Signed webhooks
Standard Webhooks signatures, three days of retries and a replayable event stream. Test every event from the dashboard.
POST /your/webhook
webhook-id: evt_9213
webhook-signature: v1,K3a8vX…
{ "type": "invoice.paid", "data": { "foreign_id": "ORD-261041", "amount": "49.9" } }Developers
Integrate in an afternoon. Debug in a minute.
A small REST API with HMAC-signed requests, idempotency keys and decimal-string amounts. The dashboard shows every request you send — and when one fails, exactly which part of the signature differed.
- Request log with failure reasons
- Signature checker that never reveals a valid signature
- Webhook tester: DNS, TLS, status, latency
- Sample events for every type
canonical v1
1791459990
q8Zr2mN0xT4vWc1pLk9sYb
POST
/v1/invoices
e3b0c442…b855 ← body SHA-256Checkout
The page your customers see
It knows their wallet, their network and their language — and says exactly what to do if they pay too little or too late.
25.00 USDT
Pay with your wallet
Networks
Eleven networks live
Only canonical token contracts are credited. Bitcoin is next.
TRON
Ethereum
BNB Smart Chain
Solana
TON
Base
Arbitrum One
OP Mainnet
Polygon
XRP Ledger
Litecoin
BitcoinSoon
Security
One part breached is not the whole.
Isolated signer
Private keys never touch the servers that talk to the internet. A separate signer enforces destinations, limits and a tamper-evident log.
Approvals & limits
Thresholds, two-person approval and 24-hour limits — enforced in the database itself, not only in the app.
Screened deposits
OFAC sanctions and token-issuer blacklists are checked before anything reaches your balance.
2FA everywhere
Authenticator codes at sign-in, again for payouts, webhooks and security changes. Every action is audit-logged.
Questions
How do I start?
Create an account with your email, confirm the code we send, turn on two-factor authentication — and you are in the dashboard. Create a payment link right away, or take API keys for your integration.
Which currencies can my customers pay with?
USDT on TRON, Ethereum, BNB Smart Chain, Solana, TON, Arbitrum, Optimism and Polygon; USDC on Ethereum, BNB Smart Chain, Base, Solana, Arbitrum, Optimism and Polygon; plus ETH, BNB, TRX, SOL, POL, TON, XRP and LTC.
How do I price in dollars or euros?
Create the payment link with a fiat price. We lock the exchange rate at that moment and show your customer the exact crypto amount. Links are valid for up to one hour.
What if a customer pays too little or too much?
Every on-chain payment is credited to your balance. The invoice is marked underpaid or overpaid and you get a webhook, so you decide what happens next.
Can payouts wait for my approval?
Yes. Set an amount above which payouts wait for a person, require two different team members, set a 24-hour limit, and allow payouts only to addresses on your allowlist.
How much does it cost?
Pricing depends on your volume and networks. Email us for a quote.
