​
Flexible Amounts

We strongly recommend using a flexible amounts to avoid payment validation failures.
To create a Transfer that will match any funds sent using the source deposit instructions regardless of amount, use the flexible_amount feature. Because the amount is not known ahead of time, Transfers with the flexible_amount feature only support a percentage based developer_fee_percent. Flexible amount Transfers do not support setting a fixed developer_fee. Note: Static templates have this feature enabled automatically if no amount is provided when they are created.
Request
curl --location --request POST 'https://api.bridge.xyz/v0/transfers' \
--header 'Api-Key: <API Key>' \
--header 'Idempotency-Key: <Unique Idempotency Key>' \
--data-raw '{
  "on_behalf_of": "cust_alice",
  "source": {
    "payment_rail": "wire",
    "currency": "usd",
  },
  "destination": {
    "payment_rail": "ethereum",
    "currency": "usdc",
    "to_address": "0xdeadbeef",
  },
  "developer_fee_percent": "1.0", // A 1% developer fee
  "features": {
    "flexible_amount": true,
  }
}'
Response
{
  "id": "flexible_transfer_789",
  "state": "awaiting_funds",
  "on_behalf_of": "cust_alice",
  "source": {
    "payment_rail": "wire",
    "currency": "usd"
  },
  "destination": {
    "payment_rail": "polygon",
    "currency": "usdc",
    "to_address": "0xdeadbeef"
  },
  "source_deposit_instructions": {
    // ...Bridge banking details
    "currency": "usd",
    "deposit_message": "BVI7depositmessage",
  },
 "features": {
    "flexible_amount": true
  },
  "created_at": "2023-05-05T19:39:14.316Z",
  "updated_at": "2023-05-05T19:39:15.231Z"
}
After Bridge receives funds and matches them to the Transfer, the amount will be included in API responses.
Response
{
  "id": "flexible_transfer_789",
  "amount": "1337.0",
  ...
}

​
Allow Any From Address

We strongly recommend using this feature especially for crypto deposits. If your customer sends funds from an exchange, they won’t be able to control the sending address.
Request
...
"features": {
  "allow_any_from_address": true,
}
...
  • By default, Bridge requires the sending address of the wallet sending the funds to be specified upon creating a Transfer.
  • For some use cases like consumer sending funds from an exchange, this is difficult or impossible to know ahead of time.
  • To support these use cases, Bridge has the allow_any_from_address feature.
  • If this feature is enabled, no from_address needs to be specified at Transfer creation time and any funds sent to the source deposit instructions will be matched regardless of the from_address.