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> For a complete documentation index, see https://tc.docs.syndicate.io/api/signatures/sign-typed-data/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://tc.docs.syndicate.io/_mcp/server.

# Sign Typed Data

POST https://api.syndicate.io/wallet/project/{projectId}/signTypedData
Content-Type: application/json

Sign EIP712 compliant typed data

Reference: https://tc.docs.syndicate.io/api/signatures/sign-typed-data

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `projectId` (UUID, required)

### Body (application/json)

This endpoint expects a SignTypedDataRequest.

- `signerAddress` (string, required) — Address of a project wallet that will be used to sign the 'message'.
- `message` (map from string to any, required) — Data to be signed by the 'signerAddress'. The message's structure must be correctly defined in the 'types' mapping, specified by the 'primaryType'.
- `domain` (EIP712Domain, required) — Components of the [domain seperator](https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator). At least one field is required.
- `types` (map from string to set of EIP712Types, required) — Type definitions of the domain and data you are requesting signature of. At minimum you must define the domain with key 'EIP712Domain' and the type of your message with key specified by 'primaryType'. More information [here](https://eips.ethereum.org/EIPS/eip-712#definition-of-typed-structured-data-%F0%9D%95%8A).
- `primaryType` (string, required) — Specifies the name of the key in 'types' that describes the shape of the 'message'.
- `signatureId` (UUID, optional) — (Optional) ID of the request. Needs to be a valid UUID. If provided, it will be saved and returned as the signatureId of the response. If not provided, we will generate one for you and return it as the signatureId.

## Response

### 200

- `message` (any, required) — The raw data requested to be signed.
- `signature` (string, required) — The signature of 'message' by the 'signerAddress'.
- `signerAddress` (string, required) — The address of the signer of the 'signature'.
- `signatureId` (UUID, required) — UUID of the signature request.

## Errors

### 400 Signature Error

- `message` (string, required)

### 500 Internal Error

- `message` (string, required)

## Types

### EIP712Domain

- `chainId` (integer, required)
- `name` (string, optional)
- `version` (string, optional)
- `verifyingContract` (string, optional)
- `salt` (string, optional)

### EIP712Types

- `name` (string, required)
- `type` (string, required)

## Examples

**Request**

```json
{
  "signerAddress": "signerAddress",
  "message": {
    "message": {
      "key": "value"
    }
  },
  "domain": {
    "chainId": 1
  },
  "types": {
    "types": [
      {
        "name": "name",
        "type": "type"
      }
    ]
  },
  "primaryType": "primaryType"
}
```

**Response**

```json
{
  "message": {
    "key": "value"
  },
  "signature": "signature",
  "signerAddress": "signerAddress",
  "signatureId": "d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32"
}
```

**SDK Code**

```python
import requests

url = "https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData"

payload = {
    "signerAddress": "signerAddress",
    "message": { "message": { "key": "value" } },
    "domain": { "chainId": 1 },
    "types": { "types": [
            {
                "name": "name",
                "type": "type"
            }
        ] },
    "primaryType": "primaryType"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"signerAddress":"signerAddress","message":{"message":{"key":"value"}},"domain":{"chainId":1},"types":{"types":[{"name":"name","type":"type"}]},"primaryType":"primaryType"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

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

func main() {

	url := "https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData"

	payload := strings.NewReader("{\n  \"signerAddress\": \"signerAddress\",\n  \"message\": {\n    \"message\": {\n      \"key\": \"value\"\n    }\n  },\n  \"domain\": {\n    \"chainId\": 1\n  },\n  \"types\": {\n    \"types\": [\n      {\n        \"name\": \"name\",\n        \"type\": \"type\"\n      }\n    ]\n  },\n  \"primaryType\": \"primaryType\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"signerAddress\": \"signerAddress\",\n  \"message\": {\n    \"message\": {\n      \"key\": \"value\"\n    }\n  },\n  \"domain\": {\n    \"chainId\": 1\n  },\n  \"types\": {\n    \"types\": [\n      {\n        \"name\": \"name\",\n        \"type\": \"type\"\n      }\n    ]\n  },\n  \"primaryType\": \"primaryType\"\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"signerAddress\": \"signerAddress\",\n  \"message\": {\n    \"message\": {\n      \"key\": \"value\"\n    }\n  },\n  \"domain\": {\n    \"chainId\": 1\n  },\n  \"types\": {\n    \"types\": [\n      {\n        \"name\": \"name\",\n        \"type\": \"type\"\n      }\n    ]\n  },\n  \"primaryType\": \"primaryType\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData', [
  'body' => '{
  "signerAddress": "signerAddress",
  "message": {
    "message": {
      "key": "value"
    }
  },
  "domain": {
    "chainId": 1
  },
  "types": {
    "types": [
      {
        "name": "name",
        "type": "type"
      }
    ]
  },
  "primaryType": "primaryType"
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"signerAddress\": \"signerAddress\",\n  \"message\": {\n    \"message\": {\n      \"key\": \"value\"\n    }\n  },\n  \"domain\": {\n    \"chainId\": 1\n  },\n  \"types\": {\n    \"types\": [\n      {\n        \"name\": \"name\",\n        \"type\": \"type\"\n      }\n    ]\n  },\n  \"primaryType\": \"primaryType\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "signerAddress": "signerAddress",
  "message": ["message": ["key": "value"]],
  "domain": ["chainId": 1],
  "types": ["types": [
      [
        "name": "name",
        "type": "type"
      ]
    ]],
  "primaryType": "primaryType"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.syndicate.io/wallet/project/d5e9c84f-c2b2-4bf4-b4b0-7ffd7a9ffc32/signTypedData")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```