# List signal types

The signal catalog: each type, what a row is and what it costs, its limits, and the parameters of its `signal` object. Read this before you build a search. `event_posts` is the old name of `events` and is answered as `events`.

## Authentication

Send `Authorization: Bearer gtk_…`. Create the key under **Connect assistant → API keys**. A missing, invalid or revoked key is **401**. A valid key while this API is not enabled for your organization answers **403** `api_not_enabled`, with what the key can do instead. Every response includes `mySDR-Api-Version`, `mySDR-Request-Id` and `Cache-Control: no-store`, and a response to an accepted key also `X-RateLimit-*` (so not a 401, a 405, an OPTIONS or a 404 for an unknown path).

## Response

- **`object`** `string` · **required** — Always `list`. One of: `list`.
- **`data`** `object[]` · **required** — One `signal_type` per type, the same object as GET /signals/{signal_type}.
- **`data[].type`** `string` · **required** — The type key.
- **`data[].object`** `string` · **required** — Always `signal_type`. One of: `signal_type`.
- **`data[].title`** `string` · **required** — Its name.
- **`data[].description`** `string` · **required** — What it finds.
- **`data[].returns`** `string` · **required** — What one row is. One of: `company`, `person`.
- **`data[].max_rows`** `integer` · **required** — Most rows one search returns; more with `cursor`.
- **`data[].default_limit`** `integer` · **required** — The `limit` of a search that sends none.
- **`data[].cost`** `object` · **required** — Credits per delivered row: `{ row_key, credits_per_row }`.
- **`data[].typical_duration_seconds`** `integer` · **required** — How long a search usually takes.
- **`data[].limits`** `string[]` · **required** — What this signal cannot see.
- **`data[].aliases`** `string[]` · **required** — Old names of the type that still work.
- **`data[].parameters`** `object` · **required** — JSON Schema of the `signal` object for this type.

## Credits

Free. Costs in `data[].cost` are what a later search charges per delivered row.

## Errors

- **401** `authentication_error` — The Authorization header is missing, or the key is unknown or revoked.
- **403** `permission_error` — API access is not part of your plan, or your account is suspended.
- **403** `api_not_enabled` — The key is valid, but the Signals API or the Company API is not enabled for your organization yet. The error says what this key can do.
- **429** `rate_limit_error` — More than 60 requests per minute, or more than 3 at the same time, on one key. Wait for the Retry-After header.
- **500** `internal_error` — Something went wrong on our side.

## Example

### cURL

```bash
curl "https://mysdr.app/api/v1/signals" \
  -H "Authorization: Bearer $MYSDR_API_KEY"
```

### JavaScript

```javascript
const response = await fetch('https://mysdr.app/api/v1/signals', {
  method: 'GET',
  headers: {
    Authorization: `Bearer ${process.env.MYSDR_API_KEY}`
  }
});
const body = await response.json();
```

### Python

```python
import json
import os
import urllib.request

request = urllib.request.Request(
    "https://mysdr.app/api/v1/signals",
    headers={
    "Authorization": f"Bearer {os.environ['MYSDR_API_KEY']}"
    },
    method="GET",
)
with urllib.request.urlopen(request) as response:
    body = json.load(response)
```

### Example response

```json
{
  "object": "list",
  "data": [
    {
      "type": "funding_raised",
      "object": "signal_type",
      "title": "Leads that raised funding",
      "returns": "company",
      "max_rows": 100,
      "default_limit": 25,
      "cost": {
        "row_key": "funding_company",
        "credits_per_row": 1
      },
      "typical_duration_seconds": 15
    }
  ]
}
```