> For the complete documentation index, see [llms.txt](https://docs.algenta.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.algenta.ai/http-api/rate-limits.md).

# Rate limits & quotas

Algenta enforces per-plan **quotas** (monthly usage) and per-endpoint **rate limits** (abuse protection). The values below are the authoritative numbers the engine enforces. Plan tiers are on [Plans, billing & credits](/deploy-and-operate/billing.md).

| Setting                                | Default   | What it limits                                    |
| -------------------------------------- | --------- | ------------------------------------------------- |
| `API_KEY_CREATE_RATE_LIMIT_PER_MINUTE` | `10`      | API-key creations per minute.                     |
| `LOGIN_RATE_LIMIT_PER_MINUTE`          | `10`      | Login attempts per minute.                        |
| `MAX_BATCH_ITEMS_FREE`                 | `10`      | Maximum batch items on the Free plan.             |
| `MAX_BATCH_ITEMS_PRO`                  | `100`     | Maximum batch items on the Pro plan.              |
| `MAX_PAYLOAD_SIZE_BYTES`               | `1048576` | Maximum request body size.                        |
| `MAX_SYNC_RUNS`                        | `100000`  | Maximum simulation runs in a synchronous request. |
| `MOJO_MAX_CONCURRENT`                  | `4`       | —                                                 |
| `QUOTA_DEVELOPER_SIMULATIONS_MONTH`    | `10000`   | Monthly simulations on the Developer plan.        |
| `QUOTA_FREE_SIMULATIONS_MONTH`         | `500`     | Monthly simulations on the Free plan.             |
| `QUOTA_PRO_SIMULATIONS_MONTH`          | `100000`  | Monthly simulations on the Pro plan.              |
| `SIGNUP_MAX_PER_DAY_PER_EMAIL`         | `2`       | Sign-ups per day per email.                       |
| `SIGNUP_RATE_LIMIT_PER_MINUTE`         | `3`       | Sign-up attempts per minute (abuse protection).   |
| `WEBHOOK_MAX_RETRIES`                  | `3`       | —                                                 |

## Handling limits

{% hint style="info" %}
A quota or rate-limit rejection returns the standard error envelope (for example `quota_exceeded` or a `429`). Back off and retry with jitter on `429`; for `quota_exceeded`, upgrade the plan or wait for the monthly reset. See [Error codes](/http-api/errors.md).
{% endhint %}

## Related

{% content-ref url="/pages/LtqjHw8bwZ1rd0qQ3xgl" %}
[Usage & limits](/deploy-and-operate/billing.md)
{% endcontent-ref %}


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