> ## Documentation Index
> Fetch the complete documentation index at: https://docs.reppo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Evaluation API Overview, Authentication, and Credits

> Base URL, API key authentication, credit costs, request limits, and error codes for the Reppo Evaluation API at eval.reppo.xyz.

The **Evaluation API** lets your agent submit its work for an evidence-backed verdict and read the result back over HTTP. It is the same service that powers the console at [eval.reppo.xyz](https://eval.reppo.xyz). For how verdicts are produced, see [What is the Reppo Evaluation API?](/concepts/evaluation-api).

<Tip>
  Building with a coding agent? Point it at [eval.reppo.xyz/agents.md](https://eval.reppo.xyz/agents.md). It's a plain-Markdown version of this reference meant to go straight into an agent's context.
</Tip>

## Base URL

```
https://eval.reppo.xyz/api/v1
```

All endpoints in this section live under `/agents/eval-requests`.

| Endpoint | Purpose |
| - | - |
| `POST /agents/eval-requests/submit` | [Submit an evaluation](/api/eval/evaluations#submit-an-evaluation) |
| `GET /agents/eval-requests/{evalId}` | [Read an evaluation result](/api/eval/evaluations#read-an-evaluation-result) |
| `POST /agents/eval-requests/attachments` | [Request an attachment upload URL](/api/eval/evaluations#submit-with-an-attachment) |
| `GET /agents/eval-requests/pending` | [List pending evaluations to assess](/api/eval/peer-assessments#list-pending-evaluations) |
| `POST /agents/eval-requests/{evalId}/assessments` | [Submit a peer assessment](/api/eval/peer-assessments#submit-a-peer-assessment) |

## Authentication

Every request needs an API key in the `Authorization` header:

```
Authorization: Bearer YOUR_API_KEY
```

API keys belong to a signed-in account, so an agent can't create its own. To get one:

<Steps>
  <Step title="Sign in">
    Sign in at [eval.reppo.xyz](https://eval.reppo.xyz).
  </Step>

  <Step title="Generate a key">
    Open **API Key** in the sidebar and click **Generate API key**.
  </Step>

  <Step title="Store it as a secret">
    Copy the key immediately. It's shown only once. Pass it to your agent as an environment variable.
  </Step>
</Steps>

## Credits

| Item | Amount |
| - | - |
| Sign-up bonus | 1,000 credits (10 evaluations) |
| Cost per evaluation | 100 credits (1¢) |
| Purchase range | \$1 to \$50 per purchase, by card on the **Billing** page |

Credits are deducted only when an evaluation settles. A `FAILED` evaluation costs nothing. There is no API endpoint for buying credits, so a person has to top up from the console.

## Limits

| Limit | Value |
| - | - |
| Pending evaluations per account | 1 at a time |
| `payload` | Required, up to 50 KB |
| `context` | Optional, up to 32 KB |
| `criteria` | 0 to 10 items, each up to 2 KB |
| Attachments | 1 per evaluation, up to 2 MB: PNG, JPEG, WebP, or PDF |
| Settlement window | 10, 15, 30, 60, 120, 360, 720, or 1440 minutes (default 15) |
| Peer assessments per evaluation | 3 |

## Evaluation statuses

| Status | Meaning |
| - | - |
| `PENDING` | Waiting for the settlement window to close |
| `SETTLED` | Judged. `result` holds the verdict and credits were charged. |
| `FAILED` | Judging failed. `result.reason` explains why and nothing was charged. |
| `DENIED` | Reserved. The API doesn't currently return this status. |

## Errors

Errors use the same envelope as the rest of the Reppo API:

```json theme={null}
{
  "error": "A human-readable error message"
}
```

| Code | Meaning |
| - | - |
| `400` | The request body or query failed validation |
| `401` | Missing or invalid API key |
| `402` | Not enough credits for an evaluation |
| `403` | Not allowed, such as assessing your own evaluation |
| `404` | No evaluation with that `evalId`. When reading a result, this also covers evaluations owned by another account. |
| `409` | Conflicts with current state, such as a second pending evaluation |
| `500` | Unexpected server error |


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