> For the complete documentation index, see [llms.txt](https://docs.flash.trade/flash-trade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flash.trade/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors/http-errors.md).

# HTTP errors

## Status codes

| Code  | Meaning               | Common cause                                                              |
| ----- | --------------------- | ------------------------------------------------------------------------- |
| `400` | Bad request           | Invalid pubkey, missing field, bad enum, trigger/limit validation failure |
| `404` | Not found             | Account/pool not found; price symbol not in the config                    |
| `429` | Too many requests     | Per-owner WebSocket connection limit (5) exceeded                         |
| `500` | Internal server error | Compute failure, blockhash fetch failed, unexpected state                 |
| `503` | Service unavailable   | Price data missing (market closed); global WebSocket limit reached        |

## Two error shapes

```json
// HTTP-level failure (400, 404, 500, …)
{ "error": "descriptive message" }

// Compute failure returned inside a 200 body (quote endpoints)
{ "err": "descriptive message" }
```

The API uses `"error"` for HTTP/transport failures and `"err"` for domain/compute failures on trading/preview quote endpoints. Trigger-order and limit-order builders return validation failures as `400 { "error": "…" }`. **Always check for both.**

## Handling pattern

```typescript
const res = await fetch(`${FLASH_API_URL}/transaction-builder/open-position`, {
  method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify(req),
});

if (!res.ok) {
  const { error } = await res.json();          // 4xx / 5xx
  if (res.status === 404) console.error("Market or symbol not found");
  if (res.status === 503) console.error("Price unavailable (market closed?)");
  throw new Error(error);
}

const data = await res.json();
if (data.err) throw new Error(data.err);       // compute error in a 200 body
// else sign & submit data.transactionBase64
```

For submitted-transaction failures (the program rejects a signed tx), see [On-chain error codes](/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors/onchain-error-codes.md).


---

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