Gemini Exchange Error Code InvalidSignature: How to Fix It

Medium 30-60 minutes High Severity Verified June 2026
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Error Code
InvalidSignature
Brand
Gemini
Product Type
crypto_exchange
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
The Gemini InvalidSignature error occurs when your API request signature doesn't match what the exchange expects. This typically happens due to incorrect API key configuration, timestamp issues, or improper HMAC SHA384 signature generation.
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Tools You'll Need

How to Fix Error Code InvalidSignature

  1. Verify API Key and Secret

    Never share your API secret key with anyone or expose it in client-side code

  2. Check System Time Synchronization

  3. Verify Request Timestamp Format

  4. Validate Base64 Encoding

  5. Regenerate HMAC SHA384 Signature

  6. Check Request Headers

  7. Test with Minimal Request

  8. Enable API Debugging

    Remove debug logging in production to avoid exposing sensitive data
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When to Call a Professional

Contact Gemini support if the error persists after following all steps, if you suspect account-level restrictions, or if you need help with advanced API implementation for institutional accounts.

Frequently Asked Questions

Why does my Gemini API signature keep failing?
Common causes include incorrect system time, wrong API key/secret, improper base64 encoding, or incorrect HMAC SHA384 signature generation. Verify each component step by step.
How do I generate a proper HMAC SHA384 signature for Gemini?
Base64 encode your JSON payload, then create an HMAC SHA384 hash using your API secret and the base64 payload, finally hex encode the result. The signature goes in the X-GEMINI-SIGNATURE header.
What timestamp format does Gemini API require?
Gemini requires timestamps in milliseconds since Unix epoch (13 digits). Use Date.now() in JavaScript or int(time.time() * 1000) in Python to get the correct format.
Can I test Gemini API signatures without real trading?
Yes, use Gemini's sandbox environment at api.sandbox.gemini.com with sandbox API keys. This allows testing without affecting real funds or orders.
How long are Gemini API keys valid?
Gemini API keys don't expire but can be revoked manually. If your key was compromised or you're getting persistent signature errors, generate new API credentials in your account settings.

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