Kraken Crypto Exchange Error Code EAPI:Invalid signature: How to Fix It

Q: What causes Kraken EAPI:Invalid signature errors?

This error typically occurs due to incorrect nonce values (not incrementing properly), wrong HMAC SHA512 signature calculation, system clock drift, or using expired/incorrect API credentials.

Q: How do I generate the correct signature for Kraken API?

The signature is HMAC-SHA512 of (URI path + SHA256(nonce + POST data)) using your base64-decoded API secret. The final result must be base64 encoded before sending in the API-Sign header.

Q: Why does my nonce keep causing signature errors?

The nonce must be unique and incrementing for each request. Use Unix timestamp in microseconds or maintain a counter. Never reuse nonce values, even across different API endpoints.

Q: Can system time affect Kraken API signatures?

Yes, if your system clock is more than 30 seconds off, signature validation may fail. Ensure your computer's time is synchronized with an NTP server for accurate timestamps.

Q: How do I test if my API credentials are working?

Start with a simple private endpoint like 'Balance' using minimal parameters. This helps verify your basic signature generation before attempting more complex trading operations.

Abstract

The Kraken EAPI:Invalid signature error occurs when your API request's cryptographic signature doesn't match what Kraken expects, typically due to incorrect nonce values or HMAC SHA512 calculation problems. This authentication error prevents your trading bot or application from connecting to Kraken's servers.