curl --request PUT \
  --url https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "values": [
      {
        "value": "Acme (old name)",
        "active_from": "2020-01-01T00:00:00Z",
        "active_until": "2021-06-15T09:30:00Z"
      },
      {
        "value": "Acme Corporation",
        "active_from": "2021-06-15T09:30:00Z",
        "active_until": null
      }
    ],
    "replace_history": true
  }
}
'

import requests

url = "https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values"

payload = { "data": {
        "values": [
            {
                "value": "Acme (old name)",
                "active_from": "2020-01-01T00:00:00Z",
                "active_until": "2021-06-15T09:30:00Z"
            },
            {
                "value": "Acme Corporation",
                "active_from": "2021-06-15T09:30:00Z",
                "active_until": None
            }
        ],
        "replace_history": True
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    data: {
      values: [
        {
          value: 'Acme (old name)',
          active_from: '2020-01-01T00:00:00Z',
          active_until: '2021-06-15T09:30:00Z'
        },
        {
          value: 'Acme Corporation',
          active_from: '2021-06-15T09:30:00Z',
          active_until: null
        }
      ],
      replace_history: true
    }
  })
};

fetch('https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'data' => [
        'values' => [
                [
                                'value' => 'Acme (old name)',
                                'active_from' => '2020-01-01T00:00:00Z',
                                'active_until' => '2021-06-15T09:30:00Z'
                ],
                [
                                'value' => 'Acme Corporation',
                                'active_from' => '2021-06-15T09:30:00Z',
                                'active_until' => null
                ]
        ],
        'replace_history' => true
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values"

	payload := strings.NewReader("{\n  \"data\": {\n    \"values\": [\n      {\n        \"value\": \"Acme (old name)\",\n        \"active_from\": \"2020-01-01T00:00:00Z\",\n        \"active_until\": \"2021-06-15T09:30:00Z\"\n      },\n      {\n        \"value\": \"Acme Corporation\",\n        \"active_from\": \"2021-06-15T09:30:00Z\",\n        \"active_until\": null\n      }\n    ],\n    \"replace_history\": true\n  }\n}")

	req, _ := http.NewRequest("PUT", 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(string(body))

}

HttpResponse<String> response = Unirest.put("https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"values\": [\n      {\n        \"value\": \"Acme (old name)\",\n        \"active_from\": \"2020-01-01T00:00:00Z\",\n        \"active_until\": \"2021-06-15T09:30:00Z\"\n      },\n      {\n        \"value\": \"Acme Corporation\",\n        \"active_from\": \"2021-06-15T09:30:00Z\",\n        \"active_until\": null\n      }\n    ],\n    \"replace_history\": true\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.attio.com/v2/lists/{list}/entries/{entry_id}/attributes/{attribute}/values")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"values\": [\n      {\n        \"value\": \"Acme (old name)\",\n        \"active_from\": \"2020-01-01T00:00:00Z\",\n        \"active_until\": \"2021-06-15T09:30:00Z\"\n      },\n      {\n        \"value\": \"Acme Corporation\",\n        \"active_from\": \"2021-06-15T09:30:00Z\",\n        \"active_until\": null\n      }\n    ],\n    \"replace_history\": true\n  }\n}"

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

{
  "data": [
    {
      "active_from": "2023-01-01T15:00:00.000000000Z",
      "active_until": "2023-01-01T15:00:00.000000000Z",
      "created_by_actor": {
        "type": "workspace-member",
        "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
      },
      "referenced_actor_type": "workspace-member",
      "referenced_actor_id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b",
      "attribute_type": "actor-reference"
    }
  ]
}

{
  "status_code": 400,
  "type": "invalid_request_error",
  "message": "This attribute accepts a single value, so its values may not be active at the same time. Please ensure the supplied intervals do not overlap."
}

{
  "status_code": 403,
  "type": "auth_error",
  "code": "unauthorized",
  "message": "You do not have the necessary permissions to write the value history of this attribute."
}

{
  "status_code": 404,
  "type": "invalid_request_error",
  "message": "List with slug/ID \"enterprise_sales\" not found."
}