---
title: "Transfer an asset from a gas pump address"
method: POST
path: "/v3/blockchain/sc/custodial/transfer"
tags: ["Gas pump"]
---

# Transfer an asset from a gas pump address

`POST /v3/blockchain/sc/custodial/transfer`

## Request

- Base URL: `https://api.tatum.io`
- URL: `https://api.tatum.io/v3/blockchain/sc/custodial/transfer`
- Auth: API key in header `x-api-key`

/v3/blockchain/sc/custodial/transfer

**2 credits per API call**

Transfer (send) an asset from a gas pump address to the other address.

This operation is usually performed by users in your custodial application: a user who has a gas pump address assigned wants to transfer an asset to some address on the blockchain.

The gas fee for sending the asset will be covered by crypto funds on the master address. Make sure that the master address always has enough funds to cover gas fees.

To be able to send the asset:

*   The gas pump address must be [activated](#operation/ActivateGasPumpAddresses).  
    To check whether the gas pump address is activated, use [this API](#operation/GasPumpAddressesActivatedOrNot).
*   The gas pump address must be the owner of the asset.

With this API, you can send only one asset per API call. If you want to send multiple assets, use the [API for transferring multiple assets from a gas pump account](#operation/TransferCustodialWalletBatch).

This API is supported for the following blockchains:

*   BNB Smart Chain
*   Celo
*   Ethereum
*   Harmony
*   Klaytn
*   Polygon
*   TRON
*   XinFin

**Signing a transaction**  
When transferring an asset, you are charged a fee for the transaction, and you must sign the transaction with the private key of the blockchain address from which the fee will be deducted.

Providing the private key in the API is not a secure way of signing transactions, because the private key can be stolen or exposed. Your private keys should never leave your security perimeter. You should use the private keys only for testing a solution you are building on the **testnet** of a blockchain.

For signing transactions on the **mainnet**, we strongly recommend that you use the Tatum [Key Management System (KMS)](https://github.com/tatumio/tatum-kms) and provide the signature ID instead of the private key in the API. Alternatively, you can use the [Tatum JavaScript client](https://github.com/tatumio/tatum-js/tree/v2).

## Request body

- union
  - TransferCustodialWallet
    - `chain` 'BSC' | 'ETH' | 'KLAY' | 'MATIC' | 'ONE' | 'XDC', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 2 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), <code>2</code> for Multi Tokens (ERC-1155 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token, NFT, or Multi Token) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token, Multi Token, or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is a Multi Token or NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `fromPrivateKey` string, required: The private key of the blockchain address that owns the gas pump address ("master address")
    - `nonce` number: The nonce to be set to the transfer transaction; if not present, the last known nonce will be used
    - `fee` CustomFee: The custom defined fee; if not present, will be calculated automatically
      - `gasPrice` string, required: The price for one gas unit (in Gwei)
      - `gasLimit` string, required: The maximum number of gas units that you are willing to spend on processing the transaction at the provided gas price
  - TransferCustodialWalletKMS
    - `chain` 'BSC' | 'ETH' | 'KLAY' | 'MATIC' | 'ONE' | 'XDC', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 2 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), <code>2</code> for Multi Tokens (ERC-1155 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token, NFT, or Multi Token) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token, Multi Token, or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is a Multi Token or NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `signatureId` string, uuid, required: The KMS identifier of the private key of the blockchain address that owns the gas pump address key ("master address")
    - `index` number: (Only if the signature ID is mnemonic-based) The index of the "master address"
    - `nonce` number: The nonce to be set to the transfer transaction; if not present, the last known nonce will be used
    - `fee` CustomFee: The custom defined fee; if not present, will be calculated automatically
      - `gasPrice` string, required: The price for one gas unit (in Gwei)
      - `gasLimit` string, required: The maximum number of gas units that you are willing to spend on processing the transaction at the provided gas price
  - TransferCustodialWalletCelo
    - `chain` 'CELO', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 2 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), <code>2</code> for Multi Tokens (ERC-1155 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token, NFT, or Multi Token) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token, Multi Token, or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is a Multi Token or NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `fromPrivateKey` string, required: The private key of the blockchain address that owns the gas pump address ("master address")
    - `feeCurrency` 'CELO' | 'CUSD' | 'CEUR': The currency in which the gas fee will be paid
    - `nonce` number: The nonce to be set to the transfer transaction; if not present, the last known nonce will be used
    - `fee` CustomFee: The custom defined fee; if not present, will be calculated automatically
      - `gasPrice` string, required: The price for one gas unit (in Gwei)
      - `gasLimit` string, required: The maximum number of gas units that you are willing to spend on processing the transaction at the provided gas price
  - TransferCustodialWalletCeloKMS
    - `chain` 'CELO', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 2 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), <code>2</code> for Multi Tokens (ERC-1155 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token, NFT, or Multi Token) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token, Multi Token, or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is a Multi Token or NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `signatureId` string, uuid, required: The KMS identifier of the private key of the blockchain address that owns the gas pump address key ("master address")
    - `index` number: (Only if the signature ID is mnemonic-based) The index of the "master address"
    - `feeCurrency` 'CELO' | 'CUSD' | 'CEUR': The currency in which the gas fee will be paid
    - `nonce` number: The nonce to be set to the transfer transaction; if not present, the last known nonce will be used
    - `fee` CustomFee: The custom defined fee; if not present, will be calculated automatically
      - `gasPrice` string, required: The price for one gas unit (in Gwei)
      - `gasLimit` string, required: The maximum number of gas units that you are willing to spend on processing the transaction at the provided gas price
  - TransferCustodialWalletTron
    - `chain` 'TRON', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token or NFT) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is an NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `fromPrivateKey` string, required: The private key of the blockchain address that owns the gas pump address ("master address")
    - `feeLimit` number, required: The maximum amount to be paid as the gas fee (in TRX)
  - TransferCustodialWalletTronKMS
    - `chain` 'TRON', required: The blockchain to work with
    - `custodialAddress` string, required: The gas pump address that transfers the asset; this is the address that you <a href="#operation/PrecalculateGasPumpAddresses">precalculated</a> and <a href="#operation/ActivateGasPumpAddresses">activated</a> earlier and that is assigned to a customer in your custodial application; this is not the "master address"
    - `from` string, required: The blockchain address that owns the gas pump address ("master address") in the Base58 format
    - `recipient` string, required: The blockchain address that receives the asset
    - `contractType` 0 | 1 | 3, required: The type of the asset to transfer. Set <code>0</code> for fungible tokens (ERC-20 or equivalent), <code>1</code> for NFTs (ERC-721 or equivalent), or <code>3</code> for native blockchain currencies.
    - `tokenAddress` string: (Only if the asset is a fungible token or NFT) The address of the token to transfer. Do not use if the asset is a native blockchain currency.
    - `amount` string: (Only if the asset is a fungible token or native blockchain currency) The amount of the asset to transfer. Do not use if the asset is an NFT.
    - `tokenId` string: (Only if the asset is an NFT) The ID of the token to transfer. Do not use if the asset is a fungible token or native blockchain currency.
    - `signatureId` string, uuid, required: The KMS identifier of the private key of the blockchain address that owns the gas pump address key ("master address")
    - `index` number: (Only if the signature ID is mnemonic-based) The index of the "master address"
    - `feeLimit` number, required: The maximum amount to be paid as the gas fee (in TRX)

## Response `200`

OK

- union
  - TransactionHash
    - `txId` string, required: The hash (ID) of the transaction
  - SignatureId
    - `signatureId` string, uuid, required: The internal Tatum ID of the prepared transaction for Key Management Sysytem (KMS) to sign<br/>This is different from the <code>signatureId</code> parameter that you provided in the request body. The <code>signatureId</code> parameter in the request body specifies the signature ID associated with the private key in KMS.

## Other responses

- `400`: Bad Request
- `401`: Unauthorized. Not valid or inactive subscription key present in the HTTP Header.
- `403`: Forbidden. The request is authenticated, but it is not possible to perform the operation due to logical error or invalid permissions.
- `500`: Internal server error. There was an error on the server during the processing of the request.

---

[API](https://skmtc.dev/tatum/apis/smart-contracts.md) - [All operations](https://skmtc.dev/tatum/apis/smart-contracts/llms.txt) - [OpenAPI document](https://skmtc.dev/tatum/apis/smart-contracts/revisions/c0146043bb37?raw)