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POST
/
accounts
/
{accountId}
/
fiat-to-crypto
/
payment-sessions
Create a fiat-to-crypto payment session
curl --request POST \
  --url https://api.venlyfinance.com/v1/accounts/{accountId}/fiat-to-crypto/payment-sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inAmount": "100.00",
  "inCurrency": "EUR",
  "outCryptocurrency": "USDC",
  "callbackUrl": "https://example.com/webhooks/pay-in",
  "successRedirectUrl": "https://example.com/pay-in/success",
  "failureRedirectUrl": "https://example.com/pay-in/failure",
  "externalRef": "order-67890",
  "idempotencyKey": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
}
'
{
  "success": true,
  "result": {
    "id": "5e6f7081-92a3-4b4c-8d5e-6f708192a3b4",
    "accountId": "b2a1f0e9-8c7d-4e3a-9f21-0a1b2c3d4e5f",
    "status": "CREATED",
    "inAmount": 100,
    "inCurrency": "EUR",
    "outCryptocurrency": "USDC",
    "paymentUrl": "https://pay.example.com/session/5e6f708192a3b4c8",
    "externalRef": "order-67890",
    "walletId": "9f8e7d6c-5b4a-4938-8271-6a5b4c3d2e1f",
    "blockchainTxId": null,
    "cancellable": true,
    "expiresAt": "2026-01-15T10:30:00Z",
    "metadata": {
      "orderId": "67890"
    },
    "idempotencyKey": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "createdAt": "2026-01-15T09:30:00",
    "updatedAt": "2026-01-15T09:30:00"
  }
}
Creates a hosted pay-in session. Redirect the payer to the returned paymentUrl; on completion the fiat is converted to the chosen cryptocurrency and credited to the account’s wallet. Provide a callbackUrl and a unique idempotencyKey (safe retries).
The account must be verified before a pay-in session can be created. See Account verification.

Authorizations

​
Authorization
string
header
required

OAuth2 client credentials flow. Token endpoints:

Path Parameters

​
accountId
string<uuid>
required

Unique account identifier

Body

application/json
​
inAmount
string
required

Fiat amount to pay in

Pattern: ^\d+(\.\d{1,2})?$
​
inCurrency
string
required

Fiat currency of the incoming payment (e.g. EUR)

Minimum string length: 1
​
outCryptocurrency
string
required

Cryptocurrency to convert the incoming fiat to (e.g. USDC)

Minimum string length: 1
​
callbackUrl
string
required

HTTPS URL to receive payment status callbacks

Pattern: ^https://.*
​
idempotencyKey
string<uuid>
required

Unique UUID key to prevent duplicate operations on retry

​
successRedirectUrl
string

URL to redirect the user to on successful payment

​
failureRedirectUrl
string

URL to redirect the user to on failed payment

​
externalRef
string

Optional external reference

Maximum string length: 255
​
metadata
object

Response

Payment session created

​
success
boolean

Indicates whether the request was successful

​
result
object