Advanced Trade API Legacy Key Authentication

Legacy API key authentication is supported but optional for both Advanced Trade and Sign in with Coinbase APIs. Coinbase recommends that you generate keys on the Coinbase Developer Platform (CDP).

Legacy API keys are for individuals or applications for individual use. They can be used with Advanced REST APIs & WebSocket channels (except new features).

Creating Legacy Keys

Generate an API key on Coinbase.com and copy the API key string and API secret to create a signature.

1. Login and navigate to https://www.coinbase.com/settings/api.
2. Select New API Key and enter you 2FA code.
3. Configure the following key details:
   • Accounts
   • Permissions
   • Notifications
   • Allowlist IPs
4. Securely store the values of your new API key and API secret. They will not be shown again.

Signing Requests

All Advanced Trade REST API requests with legacy API keys must contain the following headers:

Header	Description
CB-ACCESS-KEY	API key as a string (that you create on coinbase.com)
CB-ACCESS-SIGN	Encoded signature using API secret
CB-ACCESS-TIMESTAMP	Timestamp for your request

tip

Advanced Trade does not require a PASSPHRASE as did Coinbase Pro.

Creating a Signature

1. Create a signature string by concatenating the values of these query parameters with the + operator: timestamp + method + requestPath + body.

   • timestamp is the same as the CB-ACCESS-TIMESTAMP header (+/-30 seconds)
   • method should be UPPER CASE
   • requestPath is the full path (minus the base URL and query parameters), for example:
     • /api/v3/brokerage/orders/historical/fills
     • /api/v3/brokerage/products/BTC-USD/ticker
   • body is the request body string -- it is omitted if there is no request body (typically for GET requests)

2. Create a sha256 HMAC object with your API secret on the signature string.

3. Get the hexadecimal string representation of the sha256 HMAC object and pass that in as the CB-ACCESS-SIGN header.

lowercase signature

A signature must be in lowercase letters or the program throws a 401 error.

Signature Code Samples

The following examples demonstrate how to generate a signature in Python, Ruby, and JavaScript:

import json, hmac, hashlib, time, base64
#timestamp = str(int(time.time())) 
#request.method = GET or POST
#request.path_url.split('?')[0] = /api/v3/brokerage/orders/historical/batch
message = timestamp + request.method + request.path_url.split('?')[0] + str(request.body or '')
signature = hmac.new(secretKey.encode('utf-8'), message.encode('utf-8'), digestmod=hashlib.sha256).digest()
print(signature.hex(), ts)

timestamp = Time.now.to_i
payload = "#{timestamp}#{method}#{request_path}#{body}";
# create a sha256 hmac with the secret
signature = OpenSSL::HMAC.hexdigest('sha256', secret, payload)

const CryptoJS = require('crypto-js');
function sign(str, secret) {
  const hash = CryptoJS.HmacSHA256(str, secret);
  return hash.toString();
}
const timestamp = Math.floor(Date.now() / 1000).toString();
const str = timestamp + req.Method + req.Path + req.Body 
const sig = sign(str, apiSecret)

tip

The Advanced Trade requestPath should only include the path of the API endpoint in the string for hashing. It should not include the base URL (protocol and domain) nor any query parameters. By contrast, the SIWC requestPath does include query parameters.

API	requestPath	Valid Example
Advanced (v3)	API endpoint	/api/v3/brokerage/products/BTC-USD/ticker
SIWC (v2)	API endpoint + query params	/v2/exchange-rates?currency=USD

Making Requests

All private API requests must include CB-ACCESS-* headers:

1. Set a timestamp for the CB-ACCESS-TIMESTAMP header.
2. Create an encoded signature as the CB-ACCESS-SIGN header (with the API secret).
3. Set your legacy API key for the CB-ACCESS-KEY header.
4. Apply the headers to the request. You are ready to send.

Example Request

curl https://api.coinbase.com/v3/brokerage/accounts \
  --header "CB-ACCESS-KEY: <your api key>" \
  --header "CB-ACCESS-SIGN: <the user generated message signature>" \
  --header "CB-ACCESS-TIMESTAMP: <a timestamp for your request>"

All requests should have content type application/json and the body must be valid JSON.

// Ruby code sample of a GET Request to product ticker

require 'uri'
require 'net/http'
require 'openssl'
 
url = URI("https://coinbase.com/api/v3/brokerage/products/BTC-USD/ticker?limit=3")
request_path= "/api/v3/brokerage/products/BTC-USD/ticker"
body = ""
method = "GET"
 
timestamp = Time.now.to_i
payload = "#{timestamp}#{method}#{request_path}#{body}"
# create a sha256 hmac with the secret
signature = OpenSSL::HMAC.hexdigest('sha256', $SECRET_KEY, payload)
 
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
 
request = Net::HTTP::Get.new(url)
request["accept"] = 'application/json'
request["CB-ACCESS-KEY"] = $ACCESS_KEY
request["CB-ACCESS-SIGN"] = signature
request["CB-ACCESS-TIMESTAMP"] = timestamp
 
response = http.request(request)
puts response.read_body