# Estimate a task

> What this request would cost — a ceiling: the job, when run, is charged for what it delivers, never more. Nothing runs and nothing is held.

`POST https://api.refabric.com/v1/tasks/{name}/estimate`

**Authentication.** A key with `tasks:read`: the price is your account's.

**Key features**

- A body field the task's input schema (`GET /v1/tasks/{name}`) does not list is refused (`422 field_not_accepted`, naming it), never ignored.

**Common use cases**

- Show a price before you run a task.

**Conflicts.** A task that was removed answers `410 task_removed`; an unknown name `404`.

**See also**

- `POST /v1/tasks/{name}`

Authentication: `Authorization: Key $REFABRIC_API_KEY`, scope `tasks:read`.

## Path parameters

- `name` (string, _required_)

## Header parameters

- `Refabric-Version` (string, _optional_, format: date) — The contract version you wrote against (a date). Absent: the current version.
- `X-Request-ID` (string, _optional_, max length 128) — Your own id for this request; we answer it back under X-Client-Request-ID.

## Response 200

Done: the answer is in the body.

- `task` (string, _required_) — The task priced.
  Example: `image.generate`
- `ceiling` (integer, _required_) — The most the request can cost, in credits; you are charged for what is delivered, never more.
  Example: `4`
- `credit_type` (string | null, _required_) — Which kind of credit an amount is counted in. `null` when the request costs nothing.
  Values: `refabric_credits` (Spent by tasks.); `model_credits` (Credits for model training.)
  Example: `refabric_credits`
- `is_ceiling` (boolean, _required_) — Always `true`: the figure is a ceiling.
  Example: `true`

```json
{
  "task": "image.generate",
  "ceiling": 4,
  "credit_type": "refabric_credits",
  "is_ceiling": true
}
```

## Response 400

The request cannot be read as it was sent (a header, the URL or the body's form).

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 401

No valid API key was sent.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 403

Your key or your plan does not allow this.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 404

Nothing has this address.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 410

This was removed.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 413

The body is larger than this operation takes.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 415

The body's media type is not one this operation takes.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 422

A field is missing or has a value this operation cannot use.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 429

Too many requests: wait for the number of seconds in the Retry-After header.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Response 500

Something went wrong on our side; retry, and quote the request id if it keeps happening.

```json
{
  "error": {
    "code": "string",
    "type": "invalid_request",
    "message": "string",
    "field": "string",
    "retryable": true,
    "docs": "string",
    "request_id": "string",
    "ctx": {
      "required": 0,
      "balance": 0,
      "retry_after": 0
    },
    "input": null,
    "job_id": "string",
    "required": 0,
    "balance": 0
  }
}
```

## Request

```python
import os
import requests

url = "https://api.refabric.com/v1/tasks/{name}/estimate"

payload = {}
headers = {
    "Authorization": f"Key {os.environ['REFABRIC_API_KEY']}",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.refabric.com/v1/tasks/{name}/estimate';
const options = {
    method: 'POST',
    headers: {Authorization: `Key ${process.env.REFABRIC_API_KEY}`, 'Content-Type': 'application/json'},
    body: '{}'
};

try {
    const response = await fetch(url, options);
    const data = await response.json();
    console.log(data);
} catch (error) {
    console.error(error);
}
```

```bash
curl --request POST \
    --url https://api.refabric.com/v1/tasks/{name}/estimate \
    --header "Authorization: Key $REFABRIC_API_KEY" \
    --header 'Content-Type: application/json' \
    --data '{}'
```