Tatum
Powered by Redocly

Harmony

Harmony.ONE is an Oneeum L2 scaling solution 100% EVM compatible, and is very good for decentralized application (Dapp) development within many possible verticals including DeFi, NFT, Gaming, and many others.
Tatum supports 2 chains:

  • Mainnet - a regular live chain
  • Testnet - a chain used for testing purposes. Coins on the test chain have no value and can be obtained from a faucet, e.g. https://faucet.pops.one/

Generate ONE wallet

1 credit per API call

Tatum supports BIP44 HD wallets. It is very convenient and secure, since it can generate 2^31 addresses from 1 mnemonic phrase. Mnemonic phrase consists of 24 special words in defined order and can restore access to all generated addresses and private keys.
Each address is identified by 3 main values:

  • Private Key - your secret value, which should never be revealed
  • Public Key - public address to be published
  • Derivation index - index of generated address

Tatum follows BIP44 specification and generates for ONE wallet with derivation path m'/44'/60'/0'/0. More about BIP44 HD wallets can be found here - https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki. Generate BIP44 compatible ONE wallet.

SecurityX-API-Key
Request
query Parameters
mnemonic
string <= 500 characters

Mnemonic to use for generation of extended public and private keys.

Responses
200

OK

400

Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.

401

Unauthorized. Not valid or inactive subscription key present in the HTTP Header.

500

Internal server error. There was an error on the server during the processing of the request.

get/v3/one/wallet
Request samples 
Response samples 
application/json
{
  • "mnemonic": "urge pulp usage sister evidence arrest palm math please chief egg abuse",
  • "xpub": "xpub6EsCk1uU6cJzqvP9CdsTiJwT2rF748YkPnhv5Qo8q44DG7nn2vbyt48YRsNSUYS44jFCW9gwvD9kLQu9AuqXpTpM1c5hgg9PsuBLdeNncid"
}
Generate ONE account address from Extended public key
1 credit per API call


Generate ONE account deposit address from Extended public key. Deposit address is generated for the specific index - each extended public key can generate
up to 2^31 addresses starting from index 0 until 2^31.


SecurityX-API-Key 
Request 
path Parameters
xpub
required
string
Extended public key of wallet.


 
 Example:  xpub6EsCk1uU6cJzqvP9CdsTiJwT2rF748YkPnhv5Qo8q44DG7nn2vbyt48YRsNSUYS44jFCW9gwvD9kLQu9AuqXpTpM1c5hgg9PsuBLdeNncid
index
required
number
Derivation index of desired address to be generated.


 
 Example:  1
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/address/{xpub}/{index}
Request samples 
Response samples 
application/json
{
  • "address": "one15annzcwtlcq3dfx7nc6plpr9jsxzyyw5xc8pjn"
}
Transform HEX address to Bech32 ONE address format
1 credit per API call


Transform HEX address to Bech32 format with one prefix.


SecurityX-API-Key 
Request 
path Parameters
address
required
string
Address in HEX (ETH compatible) format.


 
 Example:  0xa7673161CbfE0116A4De9E341f8465940c2211d4
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/address/format/{address}
Request samples 
Response samples 
application/json
{
  • "address": "one15annzcwtlcq3dfx7nc6plpr9jsxzyyw5xc8pjn"
}
Generate ONE private key
1 credit per API call


Generate private key of address from mnemonic for given derivation path index. Private key is generated for the specific index - each mnemonic
can generate up to 2^31 private keys starting from index 0 until 2^31.


SecurityX-API-Key 
Request 
Request Body schema: application/json
index
required
integer  <= 2147483647 
Derivation index of private key to generate.


 
mnemonic
required
string  [ 1 .. 500 ] characters 
Mnemonic to generate private key from.


 
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


post/v3/one/wallet/priv
Request samples 
application/json
{
  • "index": 0,
  • "mnemonic": "urge pulp usage sister evidence arrest palm math please chief egg abuse"
}
Response samples 
application/json
{
  • "key": "cTmS2jBWXgFaXZ2xG9jhn67TiyTshnMp3UedamzEhGm6BZV1vLgQ"
}
Web3 HTTP driverDeprecated
2 credits per API call


This endpoint is deprecated. Use the HTTP-based JSON RPC driver instead.



Use this endpoint URL as a http-based web3 driver to connect directly to the ONE node provided by Tatum.
To learn more about ONE Web3, visit the ONE developer's guide.


SecurityX-API-Key 
Request 
path Parameters
xApiKey
required
string
Tatum X-API-Key used for authorization.


 
 Example:  asdlkfjnqunalkwjfnq2oi303294857k
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Request Body schema: application/json
object
Any valid Web3 method content body.


 
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


post/v3/one/web3/{xApiKey}
Request samples 
application/json
{
  • "jsonrpc": "2.0",
  • "method": "web3_clientVersion",
  • "params": [ ],
  • "id": 2
}
Response samples 
application/json
{
  • "jsonrpc": "2.0",
  • "id": 2,
  • "result": "Geth/v1.9.9-omnibus-e320ae4c-20191206/linux-amd64/go1.13.4"
}
Get current block number
1 credit per API call


Get ONE current block number. This is the number of the latest block in the blockchain.


SecurityX-API-Key 
Responses 
200
OK


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/block/current
Request samples 
Response samples 
application/json
[
  • {
    }
]
Get ONE block by hash
1 credit per API call


Get ONE block by block hash or block number.


SecurityX-API-Key 
Request 
path Parameters
hash
required
string
Block hash or block number


 
 Example:  6470657
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/block/{hash}
Request samples 
Response samples 
application/json
{
  • "difficulty": "3296820833",
  • "extraData": "0x",
  • "gasLimit": 8000000,
  • "gasUsed": 7985124,
  • "hash": "0x5d40698ee1b1ec589035f2a39c6162287e9056868cc79d66cfb248ba9f66c3fc",
  • "logsBloom": "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",
  • "miner": "0xD8869d9E3d497323561Fbca2319a9FC3F6f10c4B",
  • "mixHash": "0x7a44a1f56f12ae825fdc04550d7c3af2344daab987691771c06235f25fafcaa6",
  • "nonce": "0xfa1692f52a7ac672",
  • "number": 6470657,
  • "parentHash": "0xd34aab8a455027086ac54034e68608c84d984401a883b7b5d91f9ae0bbefda15",
  • "receiptsRoot": "0x4a496b6b7f2a1c5850bf9eebbea7193807be0067b1c06f17b9dde4eef7b2f960",
  • "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  • "size": 15296,
  • "stateRoot": "0x32757c92f10c6c5a106c6fb4b9ca3ff301e413a59ca3d0513b4bf98c72efddba",
  • "timestamp": 1569600592,
  • "totalDifficulty": "23329673338013873",
  • "transactions": [
    ],
  • "transactionsRoot": "0x5990081ef8515d561b50255af03c5d505f7725ddef27405dc67d23bfd0f47704"
}
Get ONE Account balance
1 credit per API call


Get ONE account balance in ONE. This method does not prints any balance of the HRM20 or HRM721 tokens on the account.


SecurityX-API-Key 
Request 
path Parameters
address
required
string
Account address you want to get balance of


 
 Example:  0x3223AEB8404C7525FcAA6C512f91e287AE9FfE7B
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/account/balance/{address}
Request samples 
Response samples 
application/json
{
  • "balance": "10.52"
}
Get ONE Transaction
2 credits per API call


Get ONE transaction by transaction hash.


SecurityX-API-Key 
Request 
path Parameters
hash
required
string
Transaction hash


 
 Example:  0xe6e7340394958674cdf8606936d292f565e4ecc476aaa8b258ec8a141f7c75d7
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


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 required perform 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.


get/v3/one/transaction/{hash}
Request samples 
Response samples 
application/json
{
  • "blockHash": "0xcf2c40f475e78c7c19778e1ae999a0e371c9319b38182ea15dc94536f13f9137",
  • "status": true,
  • "blockNumber": 6470854,
  • "from": "0x81b7E08F65Bdf5648606c89998A9CC8164397647",
  • "gas": 21000,
  • "gasPrice": "1000000000",
  • "transactionHash": "0x4fb94db21613051e6241f456dcc7da5789faae6a434ecd59c7ac4162e591ce1d",
  • "ethHash": "0xb2a66a105f05304afc7194063b36cae2a8f14edf1e06fc1e185cfea635cf09bb",
  • "input": "0x",
  • "nonce": 26836405,
  • "to": "0xbC546fa1716Ed886967cf73f40e8F2F5e623a92d",
  • "transactionIndex": 3,
  • "value": "1000000000000000000",
  • "gasUsed": 21000,
  • "cumulativeGasUsed": 314159,
  • "contractAddress": "0x81b7E08F65Bdf5648606c89998A9CC8164397647",
  • "logs": [
    ]
}
Get count of outgoing ONE transactions
1 credit per API call


Get a number of outgoing ONE transactions for the address. When a transaction is sent, there can be multiple outgoing transactions,
which are not yet processed by the blockchain. To distinguish between them, there is a counter called a nonce, which represents
the order of the transaction in the list of outgoing transactions.


SecurityX-API-Key 
Request 
path Parameters
address
required
string  = 42 characters 
address


 
 Example:  0xdac17f958d2ee523a2206206994597c13d831ec7
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


401
Unauthorized. Not valid or inactive subscription key present in the HTTP Header.


500
Internal server error. There was an error on the server during the processing of the request.


get/v3/one/transaction/count/{address}
Request samples 
Response samples 
application/json
5
Send ONE from account to account
2 credits per API call


Send ONE from account to account.


The default shard 0 is used for the sender and the recipient.


Signing a transaction

When sending ONE, 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) and provide the signature ID instead of the private key in the API. Alternatively, you can use the Tatum JavaScript client.

Alternatively, using the Tatum client library for supported languages.


SecurityX-API-Key 
Request 
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Request Body schema: application/json
One of:
amount
required
string^[+]?((\d+(\.\d*)?)|(\.\d+))$
The amount to transfer


 
currency
required
string
The currency of the amount to transfer


 Value: "ONE"  
to
required
string  = 42 characters 
The blockchain address to transfer the amount to


 
fromPrivateKey
required
string  = 66 characters 
The private key of the blockchain address from which the fee will be deducted


 
object (CustomFee) 
The custom defined fee; if not present, will be calculated automatically


 
gasPrice
required
string^[+]?\d+$
The price for one gas unit (in Gwei)


 
gasLimit
required
string^[+]?\d+$
The maximum number of gas units that you are willing to spend on processing the transaction at the provided gas price


 
data
string  <= 50000 characters 
Additional data that can be passed to a blockchain transaction as a data property; must be in the hexadecimal format


 
nonce
number  >= 0 
The nonce to be set to the transaction; if not present, the last known nonce will be used


 
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


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 required perform 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.


post/v3/one/transaction
Request samples 
application/json
{
  • "amount": "100000",
  • "currency": "ONE",
  • "to": "0x687422eEA2cB73B5d3e242bA5456b782919AFc85",
  • "fromPrivateKey": "0x05e150c73f1920ec14caa1e0b6aa09940899678051a78542840c2668ce5080c2"
}
Response samples 
application/json
{
  • "txId": "c83f8818db43d9ba4accfe454aa44fc33123d47a4f89d47b314d6748eb0e9bc9"
}
Invoke a method in a smart contract on Harmony
2 credits per API call


Invoke a method in an existing smart contract on Harmony.


You can call a read-only or write method.


    

  • For read-only methods, the output of the invoked method is returned.
    • 

  • For write methods, the ID of the associated transaction is returned.
    • 

        

Troubleshooting a failed transaction

Tatum ensures that this API works against the blockchain (accesses the blockchain, finds the specified smart contract, and executes the specified ABI method with the provided parameters).
However, because this API can be run against any smart contract on the blockchain, Tatum cannot in any way guarantee that the method itself will be executed successfully.


If you have issues with invoking the method, refer to the user documentation for this method, or contact the author of the smart contract.


For more information about invoking methods in smart contracts, see this article on our Support Portal.


Signing a transaction

When invoking a method in a smart contract, 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) and provide the signature ID instead of the private key in the API. Alternatively, you can use the Tatum JavaScript client.


SecurityX-API-Key 
Request 
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Request Body schema: application/json
One of:
contractAddress
required
string  = 42 characters 
The address of the smart contract


 
methodName
required
string  [ 1 .. 500 ] characters 
Name of the method to invoke on smart contract.


 
methodABI
required
object
ABI of the method to invoke.


 
params
required
Array of strings
 
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


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 required perform 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.


post/v3/one/smartcontract
Request samples 
application/json
{
  • "contractAddress": "0x687422eEA2cB73B5d3e242bA5456b782919AFc85",
  • "methodName": "transfer",
  • "methodABI": {
    },
  • "params": [
    ]
}
Response samples 
application/json
{
  • "txId": "c83f8818db43d9ba4accfe454aa44fc33123d47a4f89d47b314d6748eb0e9bc9"
}
Broadcast signed ONE transaction
2 credits per API call


Broadcast signed transaction to ONE blockchain. This method is used internally from Tatum KMS or Tatum client libraries.
It is possible to create custom signing mechanism and use this method only for broadcasting data to the blockchain.


SecurityX-API-Key 
Request 
query Parameters
shardID
number
 Default:  0
Shard to read data from


 
 Example:  shardID=0
Request Body schema: application/json
txData
required
string  [ 1 .. 500000 ] characters 
Raw signed transaction to be published to network.


 
signatureId
string <uuid> 
ID of prepared payment template to sign. Required only, when broadcasting transaction signed by Tatum KMS.


 
index
number  [ 0 .. 2147483647 ] 
(Only if the signature ID is mnemonic-based and you run KMS v6.2 or later) The index of the address to send the assets from that was generated from the mnemonic


 
Responses 
200
OK


400
Bad Request. Validation failed for the given object in the HTTP Body or Request parameters.


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 required perform 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.


post/v3/one/broadcast
Request samples 
application/json
{
  • "txData": "62BD544D1B9031EFC330A3E855CC3A0D51CA5131455C1AB3BCAC6D243F65460D"
}
Response samples 
application/json
{
  • "txId": "c83f8818db43d9ba4accfe454aa44fc33123d47a4f89d47b314d6748eb0e9bc9"
}
➔ Next to Klaytn