> For the complete documentation index, see [llms.txt](https://stablemesh.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://stablemesh.gitbook.io/docs/home/stablemesh-doc/developers/api/errors.md).

# Errors

The API uses standard HTTP status codes plus an application `code` in the JSON body.

* **`200 OK`** — success. Action endpoints return `{ "code": 0, "message": "ok" }`.
* **`400 Bad Request`** — a business/validation error. Body: `{ "code": <non-zero>, "message": "..." }`.
* **`401 Unauthorized`** — missing, unknown, or revoked API key.

Always check the `code` field even on a `200` response.

***

## Common error codes

| `code`  | Name                              | Meaning                                                                                                                                                   |
| ------- | --------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `0`     | SUCCESS                           | OK                                                                                                                                                        |
| `400`   | ILLEGAL\_PARAMETER                | A required field is missing or invalid                                                                                                                    |
| `3000`  | ASSET\_NOT\_FOUND                 | No balance for the requested currency                                                                                                                     |
| `3001`  | ASSET\_NOT\_ENOUGH                | USDT balance too low for this action                                                                                                                      |
| `4001`  | CARD\_NOT\_FOUND                  | No such card for your account                                                                                                                             |
| `4004`  | BIN\_NOT\_FOUND                   | Unknown card BIN                                                                                                                                          |
| `4005`  | BIN\_DISABLED                     | The card BIN is disabled                                                                                                                                  |
| `4007`  | REJECTED\_HAVING\_PENDING\_ORDERS | A conflicting operation is pending on this card                                                                                                           |
| `4008`  | CARD\_IS\_DELETING                | Card is being cancelled                                                                                                                                   |
| `4009`  | CARD\_OUT\_OF\_INVENTORY          | No card inventory available — contact support                                                                                                             |
| `8001`  | DEPOSIT\_AMOUNT\_TOO\_SMALL       | Amount below the minimum (or too small to cover the deposit fee)                                                                                          |
| `4210`  | IDEMPOTENCY\_KEY\_REQUIRED        | An `Idempotency-Key` is required on this mutation but was missing (HTTP 400) — see [Idempotency](/docs/home/stablemesh-doc/developers/api/idempotency.md) |
| `4211`  | IDEMPOTENCY\_KEY\_MISMATCH        | The `Idempotency-Key` was already used with a different request (HTTP 409)                                                                                |
| `4212`  | IDEMPOTENCY\_KEY\_IN\_PROGRESS    | A request with this `Idempotency-Key` is still in flight — retry shortly (HTTP 409)                                                                       |
| `11002` | AUTH\_FAILED                      | Invalid or revoked API key (HTTP 401)                                                                                                                     |
| `9999`  | SYSTEM\_ERROR                     | Unexpected server error — retry later                                                                                                                     |

***

## Example error response

```json
{
  "code": 3001,
  "message": "Your balance is too low for this action. Please add funds to your wallet and try again."
}
```

{% hint style="info" %}
On a `3001` (insufficient balance), top up your USDT balance — see [Wallet & Funding](/docs/home/stablemesh-doc/developers/api/wallet.md) — and retry.
{% endhint %}


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