This fixed version works for me:

use Modern::Perl;

use LWP::UserAgent;
use JSON;
use Digest::SHA qw(hmac_sha256_base64 hmac_sha256_hex hmac_sha256);
use MIME::Base64;
use Time::Piece;

my $uri        = 'https://api-public.sandbox.pro.coinbase.com';
my $api_key    = '6dc071df2d42724c019f79a53464d006';
my $secret     = 'vjYZFn39LEFfbJ5z9QzdWt+HsahYTPvXInoYMD9Gq754FJL0evlG
+nHcTiaaITGF+6GfbyYnxoyCXji9OR1iEMw==';
my $passphrase = "There is no passphrase.",

my $now            = gmtime;
my $timestamp      = $now->datetime . ".000000Z";
my $request_method = "GET";
my $request_path   = '/products';
my $body           = '';
my $message        = $timestamp . $request_method . $request_path . $b
+ody;

my $decoded_secret = decode_base64($secret);

my $signature_b64 = encode_base64( hmac_sha256($message, $decoded_secr
+et) );
chomp($signature_b64);

my $ua = LWP::UserAgent->new;
$ua->agent ('Stock/1.0');
my $res = $ua->get(
    "$uri$request_path",
    'CB-ACCESS-SIGN'       => $signature_b64,
    'CB-ACCESS-TIMESTAMP'  => $timestamp,
    'CB-ACCESS-KEY'        => $api_key,
    'CB-ACCESS-PASSPHRASE' => $passphrase,
    'Content-Type'         => 'application/json'
    );

if ($res->is_success) {
    say $res->decoded_content;
} else {
    say "request failed.";
    say "status:", $res->as_string;
}

[download]

Note that I've made the following changes:

  1. Fixed the timestamp to meet their version of the ISO 8601 format
  2. Added in the path to the URI requested
  3. Changed the user agent to one not banned by the server
  4. Dumped the entire error page so you can see why it was forbidden (which directly led me to fix number 3)

In reply to Re: Coinbase API by hippo
in thread Coinbase API by ownlifeful

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.