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add simulate method docs
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Oliver Eggert
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---
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seo:
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description: Execute a dry run of any transaction type to preview results and metadata.
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labels:
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- Transaction Sending
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---
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# simulate
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[[Source]](https://github.com/XRPLF/rippled/blob/master/src/xrpld/rpc/handlers/Simulate.cpp "Source")
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The `simulate` method executes a dry run of _any_ transaction type, enabling you to preview the results and metadata of a transaction without committing them to the XRP Ledger. Since this command never submits a transaction to the network, it doesn't incur any fees.
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{% admonition type="warning" name="Caution" %}
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The `simulate` method isn't guaranteed to be the same when you actually submit a transaction because the ledger state--which affects how a transaction is processed--can change between the transaction simulation and submission.
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{% /admonition %}
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## Request Format
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An example of the request format:
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{% tabs %}
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{% tab label="WebSocket" %}
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```json
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{
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"id": 2,
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"command": "simulate",
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"tx_json" : {
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"TransactionType" : "Payment",
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"Account" : "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"Destination" : "ra5nK24KXen9AHvsdFTKHSANinZseWnPcX",
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"Amount" : {
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"currency" : "USD",
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"value" : "1",
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"issuer" : "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn"
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}
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}
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}
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```
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{% /tab %}
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{% tab label="JSON-RPC" %}
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```json
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{
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"method": "simulate",
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"params": {
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"tx_json" : {
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"TransactionType" : "Payment",
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"Account" : "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"Destination" : "ra5nK24KXen9AHvsdFTKHSANinZseWnPcX",
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"Amount" : {
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"currency" : "USD",
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"value" : "1",
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"issuer" : "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn"
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}
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}
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}
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}
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```
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{% /tab %}
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{% /tabs %}
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{% try-it method="simulate" /%}
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The request includes the following parameters:
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| Field | Type | Required? | Description |
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| --------- | ------- | --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| `tx_blob` | String | Yes | The transaction to simulate, in [binary format](https://xrpl.org/docs/references/protocol/binary-format). If you include this field, do not also include `tx_json`. |
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| `tx_json` | Object | Yes | The transaction to simulate, in JSON format. If you include this field, do not also include `tx_blob`. |
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| `binary` | Boolean | No | The default value is `false`, which returns data and metadata in JSON format. If `true`, returns data and metadata in binary format, serialized to a hexadecimal string. |
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- The simulated transaction must be unsigned.
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- The server autofills `Fee`, `Sequence`, `SigningPubKey`, and `NetworkID` fields.
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## Response Format
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An example of a successful response:
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```json
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{
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"id": 2,
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"result": {
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"applied": false,
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"engine_result": "tesSUCCESS",
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"engine_result_code": 0,
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"engine_result_message": "The simulated transaction would have been applied.",
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"ledger_index": 3,
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"meta": {
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"AffectedNodes": [
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{
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"ModifiedNode": {
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"FinalFields": {
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"Account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"AccountTxnID": "4D5D90890F8D49519E4151938601EF3D0B30B16CD6A519D9C99102C9FA77F7E0",
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"Balance": "75159663",
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"Flags": 9043968,
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"OwnerCount": 5,
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"Sequence": 361,
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"TransferRate": 1004999999
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},
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"LedgerEntryType": "AccountRoot",
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"LedgerIndex": "13F1A95D7AAB7108D5CE7EEAF504B2894B8C674E6D68499076441C4837282BF8",
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"PreviousFields": {
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"AccountTxnID": "2B44EBE00728D04658E597A85EC4F71D20503B31ABBF556764AD8F7A80BA72F6",
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"Balance": "75169663",
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"Sequence": 360
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},
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"PreviousTxnID": "2B44EBE00728D04658E597A85EC4F71D20503B31ABBF556764AD8F7A80BA72F6",
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"PreviousTxnLgrSeq": 18555460
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}
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},
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{
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"ModifiedNode": {
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"FinalFields": {
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"Balance": {
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"currency": "USD",
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"issuer": "rrrrrrrrrrrrrrrrrrrrBZbvji",
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"value": "12.0301"
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},
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"Flags": 65536,
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"HighLimit": {
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"currency": "USD",
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"issuer": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"value": "0"
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},
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"HighNode": "0",
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"LowLimit": {
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"currency": "USD",
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"issuer": "ra5nK24KXen9AHvsdFTKHSANinZseWnPcX",
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"value": "100"
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},
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"LowNode": "0"
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},
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"LedgerEntryType": "RippleState",
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"LedgerIndex": "96D2F43BA7AE7193EC59E5E7DDB26A9D786AB1F7C580E030E7D2FF5233DA01E9",
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"PreviousFields": {
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"Balance": {
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"currency": "USD",
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"issuer": "rrrrrrrrrrrrrrrrrrrrBZbvji",
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"value": "11.0301"
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}
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},
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"PreviousTxnID": "7FFE02667225DFE39594663DEDC823FAF188AC5F036A9C2CA3259FB5379C82B4",
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"PreviousTxnLgrSeq": 9787698
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}
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}
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],
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"TransactionIndex": 0,
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"TransactionResult": "tesSUCCESS",
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"delivered_amount": {
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"currency": "USD",
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"issuer": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"value": "1"
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}
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},
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"tx_json": {
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"Account": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"DeliverMax": {
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"currency": "USD",
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"issuer": "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
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"value": "1"
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},
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"Destination": "ra5nK24KXen9AHvsdFTKHSANinZseWnPcX",
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"Fee": "10",
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"Sequence": 360,
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"TransactionType": "Payment"
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}
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},
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"status": "success",
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"type": "response"
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}
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```
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The response follows the [standard format][], with a successful result containing the following fields:
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| Field | Type | Description |
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| -------------- | ------ | ----------- |
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| `tx_json` | Object | The transaction that was simulated, including auto-filled values. Included if `binary` was `false`. |
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| `tx_blob` | String | The serialized transaction that was simulated, including auto-filled values. Included if `binary` was `true`. |
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| `ledger_index` | [Ledger Index](https://xrpl.org/docs/references/protocol/data-types/basic-data-types#ledger-index) | The ledger index of the ledger that would have included this transaction. |
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| `meta` | Object | Transaction metadata, which describes the results of the transaction. Not included if the transaction fails with a code that means it wouldn’t be included in the ledger (such as a non-TEC code). Included if `binary` was `false`. |
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| `meta_blob` | String | Transaction metadata, which describes the results of the transaction. Not included if the transaction fails with a code that means it wouldn’t be included in the ledger (such as a non-TEC code). Included if `binary` was `true`. |
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## Possible Errors
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* `invalidParams` - One or more fields are specified incorrectly, or one or more required fields are missing.
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* `transactionSigned` - The transaction was signed. The simulated transaction must be unsigned.
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{% raw-partial file="/docs/_snippets/common-links.md" /%}
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