How to fix "verification code expired" when logging into OKX?

Time Synchronization Issues

1. OKX requires the timestamp in API requests to be within ±30 seconds of the server time. A mismatch triggers 'verification code expired' errors.

2. Developers must fetch the current OKX server time via /api/v5/public/time and use that value instead of local system time.

3. Even if datetime.utcnow() appears synchronized, microsecond-level drift or timezone misconfiguration can cause signature rejection.

4. Some Python environments default to naive datetime objects without UTC timezone awareness, leading to silent conversion errors during string formatting.

5. The ISO 8601 format must end with Z, and milliseconds must be truncated to exactly three digits—e.g., 2026-05-28T11:24:36.123Z.

Signature Generation Errors

1. The HMAC-SHA256 signature must concatenate timestamp, uppercase HTTP method, request path, and body in strict order.

2. Empty JSON bodies must be passed as empty strings (''), not {} or None, otherwise the message digest becomes invalid.

3. Secret key must be used as the first argument in hmac.new(); reversing the order of key and message produces an incorrect signature.

4. Base64 encoding must be applied directly to the raw digest bytes—not hex-encoded or string-wrapped versions.

5. Any trailing whitespace or invisible Unicode characters in the secret key or passphrase will invalidate the signature silently.

API Key Configuration Mistakes

1. API keys with trading or withdrawal permissions require IP binding; unbound keys are automatically deactivated after 14 days of inactivity.

2. Using a testnet API key on the production domain—or vice versa—results in immediate authentication failure with no explicit error code indicating environment mismatch.

3. Passphrases are case-sensitive and stored as irreversible hashes; entering even one character incorrectly yields a 401 response indistinguishable from an invalid API key.

4. Hardcoding credentials in source files violates security best practices and may expose keys during debugging or version control mishaps.

5. Multiple simultaneous login attempts using the same API key can trigger rate-limiting on the authentication endpoint, temporarily blocking valid requests.

Network and Routing Constraints

1. Requests routed through certain proxy servers or corporate firewalls may strip or alter the OK-ACCESS-TIMESTAMP header, causing expiration detection on the server side.

2. Load balancers or CDNs sometimes cache responses for REST endpoints—even those requiring authentication—leading to stale timestamps being reused across sessions.

3. IPv6-only network configurations may fail to resolve OKX’s DNS records correctly if dual-stack fallback is disabled at the OS level.

4. TLS handshake failures due to outdated cipher suites or certificate pinning mismatches prevent headers from reaching the authentication layer entirely.

5. Geolocation-based routing may direct requests to regional endpoints (e.g., myokx.com) that enforce stricter validation rules than the global api.okx.com domain.

Frequently Asked Questions

Q: Why does OKX reject my verification code even though I entered it within 60 seconds?A: The rejection is not about user input timing—it reflects server-side signature validation failure. The 'expired' label refers to the timestamp parameter inside the signed request, not the SMS code lifetime.

Q: Can I reuse the same timestamp across multiple requests?A: No. Each request must carry a unique, monotonically increasing timestamp. Reusing values triggers anti-replay protection and returns error code 10000.

Q: Does enabling two-factor authentication affect API login flow?A: Yes. TOTP or hardware key enrollment disables SMS-based verification for API access entirely. Only API key + passphrase + signed request are accepted.

Q: Is there a way to verify my signature logic without submitting live requests?A: Yes. OKX provides a public test endpoint /api/v5/public/time that accepts unsigned GET requests. Use it to confirm basic connectivity and time alignment before signing private endpoints.