Tatum
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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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/wallet?mnemonic=string' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/address/{xpub}/{index}' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
Response samples
application/json
{
  • "address": "0xa7673161CbfE0116A4De9E341f8465940c2211d4"
}

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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/address/format/{address}' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
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.

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
curl -i -X GET \
  https://api-eu1.tatum.io/v3/one/block/current \
  -H 'x-api-key: YOUR_API_KEY_HERE'
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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/block/{hash}?shardID=0' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
Response samples
application/json
{
  • "difficulty": "3296820833",
  • "extraData": "0x",
  • "gasLimit": 8000000,
  • "gasUsed": 7985124,
  • "hash": "0x5d40698ee1b1ec589035f2a39c6162287e9056868cc79d66cfb248ba9f66c3fc",
  • "logsBloom": "0x042080004210492080800001610060ad9600005bc81502020800000043e302020381a404000100409102040240300641108004000400007000008000c049558055a800000a0001800748900806502004200400108205005418c0218802281a0408060000533210462021050470810a010140102809011814018281115020090201068401847000a04010000c00084062000485640d00020220181150020008589105a41c0880001112034100010882545410240011402a3480050104004c310204000002009490d0012022a040c20c20011020401020140250805100410060008280200008181a220114102800001648640828200c00a94c1003a2060e001000",
  • "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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/account/balance/{address}?shardID=0' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
Response samples
application/json
{
  • "balance": "10.52"
}

Get ONE Transaction

2 credit 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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/transaction/{hash}?shardID=0' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
Response samples
application/json
{
  • "blockHash": "0xcf2c40f475e78c7c19778e1ae999a0e371c9319b38182ea15dc94536f13f9137",
  • "status": true,
  • "blockNumber": 6470854,
  • "from": "0x81b7E08F65Bdf5648606c89998A9CC8164397647",
  • "gas": 21000,
  • "gasPrice": "1000000000",
  • "transactionHash": "0xe6e7340394958674cdf8606936d292f565e4ecc476aaa8b258ec8a141f7c75d7",
  • "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
curl -i -X GET \
  'https://api-eu1.tatum.io/v3/one/transaction/count/{address}?shardID=0' \
  -H 'x-api-key: YOUR_API_KEY_HERE'
Response samples
application/json
5

Send ONE / HRM20 from account to account

2 credits per API call.


Send ONE or Tatum supported HRM20 token from account to account.

Default shard 0 is used for sender and recipient.
This operation needs the private key of the blockchain address. Every time the funds are transferred, the transaction must be signed with the corresponding private key. No one should ever send it's own private keys to the internet because there is a strong possibility of stealing keys and loss of funds. In this method, it is possible to enter privateKey or signatureId. PrivateKey should be used only for quick development on testnet versions of blockchain when there is no risk of losing funds. In production, Tatum KMS should be used for the highest security standards, and signatureId should be present in the request. 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:
data
string <= 50000 characters

Additinal data, that can be passed to blockchain transaction as data property.

currency
required
string

Currency of the transfer.

Value: "ONE"
nonce
number >= 0

Nonce to be set to ONE transaction. If not present, last known nonce will be used.

to
required
string = 42 characters

Blockchain address to send assets

object

Custom defined fee. If not present, it will be calculated automatically.

gasLimit
required
string^[+]?\d+$

Gas limit for transaction in gas price.

gasPrice
required
string^[+]?\d+$

Gas price in Gwei.

amount
required
string^[+]?((\d+(\.\d*)?)|(\.\d+))$

Amount to be sent in One.

fromPrivateKey
required
string = 66 characters

Private key of sender address. Private key, or signature Id must be present.

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
{
  • "data": "My note to recipient.",
  • "currency": "ONE",
  • "nonce": 0,
  • "to": "0x687422eEA2cB73B5d3e242bA5456b782919AFc85",
  • "fee": {
    },
  • "amount": "100000",
  • "fromPrivateKey": "0x05e150c73f1920ec14caa1e0b6aa09940899678051a78542840c2668ce5080c2"
}
Response samples
application/json
{
  • "txId": "c83f8818db43d9ba4accfe454aa44fc33123d47a4f89d47b314d6748eb0e9bc9",
  • "failed": false
}

Invoke Smart Contract method

2 credits per API call.


Invoke any method on an existing Smart Contract. It is possible to call read or write method on the Smart Contract defined via contractAddress. For read operations, data is returned, for write operations, transaction Id of the associated transaction is returned.
Default shard 0 is used for this operation.
This operation needs the private key of the blockchain address. Every time the funds are transferred, the transaction must be signed with the corresponding private key. No one should ever send it's own private keys to the internet because there is a strong possibility of stealing keys and loss of funds. In this method, it is possible to enter privateKey or signatureId. PrivateKey should be used only for quick development on testnet versions of blockchain when there is no risk of losing funds. In production, Tatum KMS should be used for the highest security standards, and signatureId should be present in the request. 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:
contractAddress
required
string = 42 characters

Address of HRM20 token

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",
  • "failed": false
}

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 blockchian.

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> = 36 characters

ID of prepared payment template to sign. Required only, when broadcasting transaction signed by Tatum KMS.

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",
  • "signatureId": "1f7f7c0c-3906-4aa1-9dfe-4b67c43918f6"
}
Response samples
application/json
{
  • "txId": "c83f8818db43d9ba4accfe454aa44fc33123d47a4f89d47b314d6748eb0e9bc9",
  • "failed": false
}
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