# arbtrace_get

> For the complete documentation index, see [llms.txt](/docs/llms.txt).

POST https://arb-mainnet.g.alchemy.com/v2/{apiKey}

Returns a specific trace at the given position within a transaction. This is an Arbitrum-specific tracing method that works for pre-Nitro blocks (before block 22,207,815). For post-Nitro blocks, use Geth debug_* methods.


Reference: https://www.alchemy.com/docs/chains/arbitrum/arbitrum-api-endpoints/arbtrace-get

## Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| Transaction hash | string | Yes | The hash of the transaction to get the trace from. |
| Trace address | string[] | Yes | An array of index positions specifying the trace address within the transaction's trace tree.  |

## Result

**Trace** (object): The trace object at the specified position.

## Example

### Request

```json
{
  "jsonrpc": "2.0",
  "method": "arbtrace_get",
  "params": [
    "0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a",
    [
      "0x0"
    ]
  ],
  "id": 1
}
```

### Response

```json
{
  "jsonrpc": "2.0",
  "result": {
    "action": {
      "callType": "call",
      "from": "0x00000000000000000000000000000000000a4b05",
      "gas": "0x0",
      "input": "0x",
      "to": "0xa4b05fffffffffffffffffffffffffffffffffff",
      "value": "0x0"
    },
    "blockHash": "0x5765e1e12766c561a99f2eca6be6dba225e5e2dbecc1c52c59dfd21f3c39071c",
    "blockNumber": 22207751,
    "result": {
      "gasUsed": "0x0",
      "output": "0x"
    },
    "subtraces": 0,
    "traceAddress": [
      0
    ],
    "transactionHash": "0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a",
    "transactionPosition": 0,
    "type": "call"
  },
  "id": 1
}
```

## Code Examples

### cURL

```bash
curl --request POST \
  --url https://arb-mainnet.g.alchemy.com/v2/docs-demo \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "arbtrace_get",
  "params": [
    "0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a",
    [
      "0x0"
    ]
  ]
}'
```

### JavaScript

```javascript
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'arbtrace_get',
    params: ['0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a', ['0x0']]
  })
};

fetch('https://arb-mainnet.g.alchemy.com/v2/docs-demo', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
```

### Python

```python
import requests

url = "https://arb-mainnet.g.alchemy.com/v2/docs-demo"

payload = {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "arbtrace_get",
    "params": ["0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a", ["0x0"]]
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
```

### Go

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://arb-mainnet.g.alchemy.com/v2/docs-demo"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"arbtrace_get\",\n  \"params\": [\n    \"0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a\",\n    [\n      \"0x0\"\n    ]\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
```

### Java

```java
HttpResponse<String> response = Unirest.post("https://arb-mainnet.g.alchemy.com/v2/docs-demo")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"arbtrace_get\",\n  \"params\": [\n    \"0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a\",\n    [\n      \"0x0\"\n    ]\n  ]\n}")
  .asString();
```

### C#

```csharp
using RestSharp;


var options = new RestClientOptions("https://arb-mainnet.g.alchemy.com/v2/docs-demo");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"arbtrace_get\",\n  \"params\": [\n    \"0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a\",\n    [\n      \"0x0\"\n    ]\n  ]\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

```


## OpenRPC Method Specification

```yaml
name: arbtrace_get
summary: Returns trace at a given position.
description: |
  Returns a specific trace at the given position within a transaction. This is an Arbitrum-specific tracing method that works for pre-Nitro blocks (before block 22,207,815). For post-Nitro blocks, use Geth debug_* methods.
x-compute-units: 20
params:
  - name: Transaction hash
    required: true
    description: The hash of the transaction to get the trace from.
    schema:
      title: 32 byte hex value
      type: string
      pattern: ^0x[0-9a-f]{64}$
  - name: Trace address
    required: true
    description: |
      An array of index positions specifying the trace address within the transaction's trace tree.
    schema:
      type: array
      items:
        title: hex encoded unsigned integer
        type: string
        pattern: ^0x([1-9a-f]+[0-9a-f]*|0)$
result:
  name: Trace
  description: The trace object at the specified position.
  schema:
    title: Trace object
    type: object
    properties:
      action:
        title: Trace action
        type: object
        properties:
          callType:
            title: Call type
            type: string
            description: The type of call (e.g., "call", "delegatecall", "staticcall").
          from:
            title: From address
            type: string
            pattern: ^0x[0-9a-fA-F]{40}$
            description: The address of the sender.
          gas:
            title: Gas
            type: string
            pattern: ^0x([1-9a-f]+[0-9a-f]*|0)$
            description: The gas provided for the call, encoded as hexadecimal.
          input:
            title: Input data
            type: string
            description: The input data sent with the call.
          to:
            title: To address
            description: The address of the receiver. Null for contract creation.
            oneOf:
              - title: hex encoded address
                type: string
                pattern: ^0x[0-9a-fA-F]{40}$
              - type: 'null'
          value:
            title: Value
            type: string
            pattern: ^0x([1-9a-f]+[0-9a-f]*|0)$
            description: The value transferred in wei, encoded as hexadecimal.
      blockHash:
        title: Block hash
        type: string
        pattern: ^0x[0-9a-f]{64}$
      blockNumber:
        title: Block number
        type: integer
        description: The block number where this trace occurred.
      error:
        title: Error
        type: string
        description: Error message if the call failed (e.g., "Reverted").
      result:
        title: Trace result
        type: object
        properties:
          gasUsed:
            title: Gas used
            type: string
            pattern: ^0x([1-9a-f]+[0-9a-f]*|0)$
            description: The amount of gas used by the trace, encoded as hexadecimal.
          output:
            title: Output
            type: string
            description: The return data from the call, encoded as hexadecimal.
      subtraces:
        title: Subtraces
        type: integer
        description: The number of sub-traces created during execution.
      traceAddress:
        title: Trace address
        type: array
        description: The trace position indices in the call tree.
        items:
          type: integer
      transactionHash:
        title: Transaction hash
        type: string
        pattern: ^0x[0-9a-f]{64}$
      transactionPosition:
        title: Transaction position
        type: integer
        description: The position of the transaction in the block.
      type:
        title: Trace type
        type: string
        description: The type of trace (e.g., "call", "create").
examples:
  - name: arbtrace_get example
    params:
      - name: Transaction hash
        value: '0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a'
      - name: Trace address
        value:
          - '0x0'
    result:
      name: Trace
      value:
        action:
          callType: call
          from: '0x00000000000000000000000000000000000a4b05'
          gas: '0x0'
          input: 0x
          to: '0xa4b05fffffffffffffffffffffffffffffffffff'
          value: '0x0'
        blockHash: '0x5765e1e12766c561a99f2eca6be6dba225e5e2dbecc1c52c59dfd21f3c39071c'
        blockNumber: 22207751
        result:
          gasUsed: '0x0'
          output: 0x
        subtraces: 0
        traceAddress:
          - 0
        transactionHash: '0xd2ea43b18e2f0acb66b36e773f20a4e9a1ee2df00a9794f63c2f4d0519cbe12a'
        transactionPosition: 0
        type: call
```