Transactions

Send Transactions to the Blockchain and query information about them.

POST Send Transaction

https://gateway.elrond.com/transaction/send

This endpoint allows one to send a signed Transaction to the Blockchain.

Body Parameters

ParamRequiredTypeDescription
versionREQUIREDnumberThe Version of the Transaction (e.g. 1).
chainIDREQUIREDstringThe Chain identifier.
nonceREQUIREDnumberThe Nonce of the Sender.
valueREQUIREDstringThe Value to transfer (can be zero).
senderREQUIREDstringThe Address (bech32) of the Sender.
receiverREQUIREDstringThe Address (bech32) of the Receiver.
gasPriceREQUIREDnumberThe desired Gas Price (per Gas Unit).
gasLimitREQUIREDnumberThe maximum amount of Gas Units to consume.
dataOPTIONALstringThe message (data) of the Transaction.
signatureREQUIREDstringThe Signature (hex-encoded) of the Transaction.

🟢 200: OK

Transaction sent with success. A Transaction Hash is returned.

{
  "txHash": "6c41c71946b5b428c2cfb560e3ea425f8a00345de4bb2eb1b784387790914277"
}

🔴 400: Bad request

Invalid Transaction signature.

{
  "error": "transaction generation failed: ed25519: invalid signature"
}
warning

For Nodes (Observers or Validators with the HTTP API enabled), this endpoint only accepts transactions whose sender is in the Node's Shard.

Here's an example of a request:

POST https://gateway.elrond.com/transaction/send HTTP/1.1
Content-Type: application/json

{
    "version": 1,
    "chainId": "v1.0.141",
    "nonce": 42,
    "value": "100000000000000000",
    "receiver": "erd1cux02zersde0l7hhklzhywcxk4u9n4py5tdxyx7vrvhnza2r4gmq4vw35r",
    "sender": "erd1njqj2zggfup4nl83x0nfgqjkjserm7mjyxdx5vzkm8k0gkh40ezqtfz9lg",
    "gasPrice": 1000000000,
    "gasLimit": 70000,
    "data": "food for cats",
    "signature": "93207c579bf57be03add632b0e1624a73576eeda8a1687e0fa286f03eb1a17ffb125ccdb008a264c402f074a360442c7a034e237679322f62268b614e926d10f"
}

POST Send Multiple Transactions

https://gateway.elrond.com/transaction/send-multiple

This endpoint allows one to send a bulk of Transactions to the Blockchain.

Body Parameters

ParamRequiredTypeDescription
versionREQUIREDnumberThe Version of the Transaction (e.g. 1).
chainIDREQUIREDstringThe Chain identifier.
nonceREQUIREDnumberThe Nonce, for each Transaction.
valueREQUIREDstringThe Value, for each Transaction.
senderREQUIREDstringThe Address of the Sender, for each Transaction.
receiverREQUIREDstringThe Address of the Receiver, for each Transaction.
gasPriceREQUIREDnumberThe Gas Price, for each Transaction.
gasLimitREQUIREDnumberThe Gas Limit, for each Transaction.
dataOPTIONALstringThe message (data), for each Transaction.
signatureREQUIREDstringThe Signature, for each Transaction.

🟢 200: OK

A bulk of Transactions were successfully sent.

{
  "numOfSentTxs": 2,
  "txsHashes": {
    "0": "6c41c71946b5b428c2cfb560e3ea425f8a00345de4bb2eb1b784387790914277",
    "1": "fa8195bae93d4609a6fc5972a7a6176feece39a6c4821acae2276701aee12fb0"
  }
}
warning

For Nodes (Observers or Validators with the HTTP API enabled), this endpoint only accepts transactions whose sender is in the Node's Shard.

Here's an example of a request:

POST https://gateway.elrond.com/transaction/send-multiple HTTP/1.1
Content-Type: application/json

[
    {
        "nonce": 42,
        "value": "100000000000000000",
        "receiver": "erd1cux02zersde0l7hhklzhywcxk4u9n4py5tdxyx7vrvhnza2r4gmq4vw35r",
        "sender": "erd1njqj2zggfup4nl83x0nfgqjkjserm7mjyxdx5vzkm8k0gkh40ezqtfz9lg",
        "gasPrice": 1000000000,
        "gasLimit": 70000,
        "data": "food for cats",
        "chainId": "v1.0.141",
        "version": 1,
        "signature": "93207c579bf57be03add632b0e1624a73576eeda8a1687e0fa286f03eb1a17ffb125ccdb008a264c402f074a360442c7a034e237679322f62268b614e926d10f"
    },
    {
        "nonce": 43,
        "value": "100000000000000000",
        "receiver": "erd1cux02zersde0l7hhklzhywcxk4u9n4py5tdxyx7vrvhnza2r4gmq4vw35r",
        "sender": "erd1rhp4q3qlydyrrjt7dgpfzxk8n4f7yrat4wc6hmkmcnmj0vgc543s8h7hyl",
        "gasPrice": 1000000000,
        "gasLimit": 70000,
        "data": "bus tickets",
        "chainID": "v1.0.141",
        "version": 1,
        "signature": "01535fd1d40d98b7178ccfd1729b3f526ee4542482eb9f591d83433f9df97ce7b91db07298b1d14308e020bba80dbe4bba8617a96dd7743f91ee4b03d7f43e00"
    }
]

POST Simulate Transaction

Nodes and observers

https://gateway.elrond.com/transaction/simulate

This endpoint allows one to send a signed Transaction to the Blockchain in order to simulate its execution. This can be useful in order to check if the transaction will be successfully executed before actually sending it. It receives the same request as the /transaction/send endpoint.

Move balance successful transaction simulation

Body Parameters

ParamRequiredTypeDescription
versionREQUIREDnumberThe Version of the Transaction (e.g. 1).
chainIDREQUIREDstringThe Chain identifier.
nonceREQUIREDnumberThe Nonce of the Sender.
valueREQUIREDstringThe Value to transfer (can be zero).
senderREQUIREDstringThe Address (bech32) of the Sender.
receiverREQUIREDstringThe Address (bech32) of the Receiver.
gasPriceREQUIREDnumberThe desired Gas Price (per Gas Unit).
gasLimitREQUIREDnumberThe maximum amount of Gas Units to consume.
dataOPTIONALstringThe message (data) of the Transaction.
signatureREQUIREDstringThe Signature (hex-encoded) of the Transaction.

A full response contains the fields above: SimulationResults

FieldTypeDescription
statusstringsuccess, fail ...
failReasonstringthe error message
scResults[]ApiSmartContractResultan array of smart contract results (if any)
receipts[]ApiReceiptan array of the receipts (if any)
hashstringthe hash of the transaction

❕ Note that fields that are empty won't be included in the response. This can be seen in the examples below

🟢 200: OK

Transaction would be successful.

{
 "status": "success",
 "hash": "bb24ccaa2da8cddd6a3a8eb162e6ff62ad4f6e1914d9aa0cacde6772246ca2dd"
}

🟢 200: Simulation was successful, but the transaction wouldn't be executed.

Invalid Transaction signature.

{
    "status": "fail",
    "failReason": "higher nonce in transaction",
    "hash": "bb24ccaa2da8cddd6a3a8eb162e6ff62ad4f6e1914d9aa0cacde6772246ca2dd"
}

🔴 400: Bad request

{
  "error": "transaction generation failed: invalid chain ID"
}

Proxy

On the Proxy side, if the transaction to simulate is a cross-shard one, then the response format will contain two elements called senderShard and receiverShard which are of type SimulationResults explained above.

Example response for cross-shard transactions:

{
 "receiverShard": {
  "status": "success",
  "hash": "bb24ccaa2da8cddd6a3a8eb162e6ff62ad4f6e1914d9aa0cacde6772246ca2dd"
 },
 "senderShard": {
  "status": "success",
  "hash": "bb24ccaa2da8cddd6a3a8eb162e6ff62ad4f6e1914d9aa0cacde6772246ca2dd"
 }
}

POST Estimate Cost of Transaction

https://gateway.elrond.com/transaction/cost

This endpoint allows one to estimate the cost of a transaction.

Body Parameters

ParamRequiredTypeDescription
versionREQUIREDnumberThe Version of the Transaction (e.g. 1).
chainIDREQUIREDstringThe Chain identifier.
valueREQUIREDstringThe Value to transfer.
senderREQUIREDstringTThe Address of the Sender.
receiverREQUIREDstringThe Address of the Receiver.
dataOPTIONALstringThe message (data) of the Transaction.

🟢 200: OK

The cost is estimated successfully.

{
  "txGasUnits": "77000"
}
tip

This endpoint returns the cost on the transaction in gas units. The returned value can be used to fill in gasLimit field of the transaction.

Here's an example of a request:

POST https://gateway.elrond.com/transaction/cost HTTP/1.1
Content-Type: application/json

{
    "value": "100000",
    "sender": "erd1l453hd0gt5gzdp7czpuall8ggt2dcv5zwmfdf3sd3lguxseux2fsmsgldz",
    "receiver": "erd188nydpkagtpwvfklkl2tn0w6g40zdxkwfgwpjqc2a2m2n7ne9g8q2t22sr",
    "data": "this is an example",
    "chainID": "v1.0.141",
    "version": 1
}

GET Get Transaction

https://gateway.elrond.com/transaction/:txHash

This endpoint allows one to query the details of a Transaction.

Path Parameters

ParamRequiredTypeDescription
txHashREQUIREDstringThe hash (identifier) of the Transaction.

Query Parameters

ParamRequiredTypeDescription
senderOPTIONALstringThe Address of the sender - a hint to optimize the request.
withResultsOPTIONALboolBoolean parameter to specify if smart contract results and other details should be returned.

🟢 200: OK

Transaction details retrieved successfully.

{
    "transaction": {
        "type": "normal",
        "nonce": 3,
        "round": 186580,
        "epoch": 12,
        "value": "1000000000000000000",
        "receiver": "erd1...",
        "sender": "erd1...",
        "gasPrice": 1000000000,
        "gasLimit": 70000,
        "data": "Zm9yIHRlc3Rz",
        "signature": "1047...",
        "sourceShard": 2,
        "destinationShard": 1,
        "blockNonce": 186535,
        "miniblockHash": "e927...",
        "blockHash": "50a1...",
        "status": "executed"
    }
}

Request URL:

https://gateway.elrond.com/transaction/:txHash?withResults=true

Response:

The response can contain additional fields such as smartContractResults, or receipt

"transaction": {
      "type": "normal",
      "nonce": 3,
      "round": 186580,
      "epoch": 12,
      "value": "1000000000000000000",
      "receiver": "erd1...",
      "sender": "erd1...",
      "gasPrice": 1000000000,
      "gasLimit": 70000,
      "data": "Zm9yIHRlc3Rz",
      "signature": "1047...",
      "sourceShard": 2,
      "destinationShard": 1,
      "blockNonce": 186535,
      "miniblockHash": "e927...",
      "blockHash": "50a1...",
      "status": "executed",
      "receipt": {
        "value": 100,
        "sender": "erd1...",
        "data": "...",
        "txHash": "b37..."
      },
      "smartContractResults": [
        {
          "hash": "...",
          "nonce": 5,
          "value": 1000,
          "receiver": "erd1...",
          "sender": "erd1...",
          "data": "@6f6b",
          "prevTxHash": "3638...",
          "originalTxHash": "3638...",
          "gasLimit": 0,
          "gasPrice": 1000000000,
          "callType": 0
        }
      ]
}
important

The optional query parameter sender is only applicable to requests against the Proxy (not against the Observer Nodes).

GET Get Transaction Status

https://gateway.elrond.com/transaction/:txHash/status

This endpoint allows one to query the Status of a Transaction.

Path Parameters

ParamRequiredTypeDescription
txHashREQUIREDstringThe hash (identifier) of the Transaction.

Query Parameters

ParamRequiredTypeDescription
senderOPTIONALstringThe Address of the sender - a hint to optimize the request.

🟢 200: OK

Transaction status retrieved successfully.

{
    "status": "executed"
}
important

The optional query parameter sender is only applicable to requests against the Proxy (not against the Observer Nodes).

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