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Off-ramp lets users sell USDT and receive EUR or USD on their debit/credit card.

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Enable Off-Ramp

Off-ramp is disabled by default. To enable it for your integration, request it during onboarding or contact the Proof team.

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Request a Sell Session

Pass "type": "sell" in the session request: 
curl -X POST https://DOMAIN/widget/session \
  -H "Authorization: Bearer <client_token>" \
  -H "Content-Type: application/json" \
  -d '{
    "partner_user_id": "user-123",
    "user_email": "user@example.com",
    "currency": "USDT",
    "network": "TRC20",
    "fiat_currency": "EUR",
    "type": "sell"
  }'
The response and widget embed process are identical to on-ramp. Use the returned parameters with proofWidget.run() as described in Quickstart.

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Requirements

All of the following must be satisfied for off-ramp to work.
RequirementDetails
Off-ramp enabledMust be enabled for your integration by Proof team
KYC verifiedUser must have a verified KYC profile. The widget handles this automatically.
Fiat currencyOnly EUR and USD are supported as fiat payout currencies
Deposit timeoutIf no crypto deposit is received within 6 hours, the sell request fails automatically

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Off-Ramp Flow

1

User initiates sell

Your frontend calls POST /widget/session with type: sell.
2

KYC check

If the user is not yet KYC verified, the widget guides them through verification first.
3

Sell widget opens

The widget shows the sell flow: the user enters amount, adds their card, and receives a deposit address.
4

User sends crypto

The user sends USDT to the designated address. The widget tracks the deposit.
5

Fiat payout

Once the deposit is confirmed, the exchange is processed and fiat is sent to the user’s card.
6

Completion

Transaction status updates to completed. You receive a WebSocket update or see it in polling.

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Transaction Statuses (Sell)

StatusDescription
pendingWaiting for user’s crypto deposit
processingCrypto deposit received, fiat payout being processed
completedFiat sent to user’s card
failedNo deposit received within 6 hours, or payout failed
cancelledUser cancelled

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Important Notes

  • If the user does not send crypto within 6 hours, the sell request automatically fails.
  • Sell is only available for EUR and USD — other fiat currencies are not supported.
  • If the API returns 403 offramp_disabled, contact the Proof team to enable off-ramp for your integration.