Why do I see order sending errors like 'Access Denied', 'Invalid signature', or 'api-signature-not-valid' when using crypto exchange APIs (e.g., BitMEX, Bitstamp, Huobi), and how can I resolve them? - Forex & Cryptocurrencies Arbitrage Software

These errors typically indicate issues with API key permissions or configuration. ‘Access Denied’ or ‘Invalid signature’ means the key or request doesn’t match the expected security settings. Resolution steps:

Double-check that the API key and secret are entered correctly.
Ensure all necessary permissions (trading, withdrawal, etc.) are granted on the exchange for the key.
For exchanges that require IP whitelisting, enter only your VPS’s IP address, not including the port number.
If problems persist, delete and generate new keys on the exchange. API connection issues are common and usually solved by reconfiguring or regenerating keys.