Set up Coinbase Prime API authentication and retrieve portfolio wallet balances

domain: docs.cdp.coinbase.com · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

  1. Generate an API key in the Prime console; record ACCESS_KEY, PASSPHRASE, and SIGNING_KEY (RSA or ECDSA depending on key type chosen)
  2. For each request build the preamble string: timestamp + HTTP_METHOD + request_path + body; sign with SIGNING_KEY using HMAC-SHA256 and base64-encode
  3. Set request headers: X-CB-ACCESS-KEY: YOUR_ACCESS_KEY, X-CB-ACCESS-PASSPHRASE: YOUR_PASSPHRASE, X-CB-ACCESS-SIGNATURE: <signature>, X-CB-ACCESS-TIMESTAMP: <unix_epoch>
  4. GET https://api.prime.coinbase.com/v1/portfolios to list portfolios; capture portfolio_id
  5. GET https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/balances?balance_type=TRADING_BALANCES to retrieve spot balances; use balance_type=VAULT_BALANCES for custody balances
  6. GET https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/wallets to enumerate wallets and their wallet_ids for downstream transfer operations

Known gotchas

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