> For the complete documentation index, see [llms.txt](https://docs.0xprocessing.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.0xprocessing.com/0xprocessing-api-v1/errors.md).

# Errors

Troubleshoot common errors in crypto payment gateway integrations and find solutions to ensure smooth operation.

**IncorrectModel** - Incorrect request model. This error can also occur if an incorrect Merchant ID is provided.

**MerchantIdRequired** - Merchant ID is required.

**Incorrect amount** - The amount is missing or invalid.

**404** - The requested resource or endpoint was not found.

**429 Too many requests** - The request rate limit has been exceeded for the IP address or user.

**UnsupportedCurrency** - Unsupported currency.

**InvalidUrl** - The URL is invalid or does not use a supported HTTP scheme.

**ActivationRequired** - Merchant activation is required.

**EmailRequired** - Email is required.

**InvalidEmail** - Invalid email address.

**InvalidBillingIdLength** - The Billing ID is too long. It must not exceed 100 characters.

**InvalidClientIdLength** - The Client ID is too long. It must not exceed 100 characters.

**UnavailableCoin** - The coin is unavailable for payment.

**ClientBlocked** - This client is blocked on 0xProcessing.

**InsufficientBalance** - The merchant has insufficient balance in the requested currency.

**InvalidDT** - Invalid Destination Tag.

**InvalidAddress** - Invalid wallet address.

**InsufficientBalanceForPayFee** - Insufficient balance to pay the processing fee.

**ExternalIdIsAlreadyUse** - This External ID has already been used for a withdrawal.

**InvalidAgentId** - Invalid Agent ID.

**InvalidClientId** - Invalid Client ID.

**WalletIsAlreadyExist** - This wallet already exists.