PAYWINCrypto Payment API

Accept USDT, BTC, ETH and 8 networks. Instant settlement, signed webhooks, finality-first reorg policy.

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Mandatory 2FA + HIBP

TOTP enrollment is required before panel access. Passwords checked against breach lists on every set.

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Memory-hard hashing for every credential. API secrets shown once, then hashed.

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HMAC-SHA256 over timestamp + body, exponential retry, full delivery log.

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Plus ERC20, BSC, BTC, ETH. Settlement straight to your wallet.

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Every state change written to merchant_audit_logs. Login attempts pruned after 90 days.

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/api/v1 with Idempotency-Key, RFC 7807 errors, IP allowlist per key.