python coinbase pro sandbox authentication request error

Question

Trying to use the example python from the coinbase pro api to do an authenticated request... it doesn't work going to the sandbox. I get the following error. Isn't there a simple request example that works on the web somewhere?

import json, hmac, hashlib, time, requests, base64
from requests.auth import AuthBase

#sandbox api keys and url
API_KEY='XX...........'
API_PASS='XX.........'
API_SECRET='XX.............'
api_url='https://public.sandbox.pro.coinbase.com/'

def jprint(obj):
    # create a formatted string of the Python JSON object
    text = json.dumps(obj, sort_keys=True, indent=4)
    print(text)

# Create custom authentication for Exchange
class CoinbaseExchangeAuth(AuthBase):
    def __init__(self, api_key, secret_key, passphrase):
        self.api_key = api_key
        self.secret_key = secret_key
        self.passphrase = passphrase

    def __call__(self, request):
        timestamp = str(time.time())
        message = timestamp + request.method + request.path_url + (request.body or b'').decode()
        hmac_key = base64.b64decode(self.secret_key)
        signature = hmac.new(hmac_key, message.encode(), hashlib.sha256)
        signature_b64 = base64.b64encode(signature.digest()).decode()

        request.headers.update({
            'CB-ACCESS-SIGN': signature_b64,
            'CB-ACCESS-TIMESTAMP': timestamp,
            'CB-ACCESS-KEY': self.api_key,
            'CB-ACCESS-PASSPHRASE': self.passphrase,
            'Content-Type': 'application/json'
        })
        return request

api_url = 'https://api.pro.coinbase.com/'
#sandbox url
api_url='https://public.sandbox.pro.coinbase.com/'
auth = CoinbaseExchangeAuth(API_KEY, API_SECRET, API_PASS)

# Get accounts
r = requests.get(api_url + 'accounts', auth=auth)
print(r.status_code)
jprint(r.json())

# Place an order
order = {
    'size': 1.0,
    'price': 1.0,
    'side': 'buy',
    'product_id': 'BTC-USD',
}
r = requests.post(api_url + 'orders', json=order, auth=auth)
print(r.status_code)
jprint(r.json())

Here is what I get back....

200

Traceback (most recent call last):

File "/Users/rockie12_us/PythonScriptsDeanO/SandBoxClientTest/test9.py", line 46, in jprint(r.json())

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/requests/models.py", line 897, in json return complexjson.loads(self.text, **kwargs)

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/init.py", line 346, in loads return _default_decoder.decode(s) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end())

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[Finished in 0.6s with exit code 1]

Dean-O Dean-O · Accepted Answer · 2020-12-17T14:50:08

To fix this I had to change this line

API_SECRET='XX.............'

to

API_SECRET= b'XX.............'

nothing in the api mentioned this needed to be binary string, that would have helped greatly.

python coinbase pro sandbox authentication request error

1 Answers