# Market programs: enter

URL: /code/mcp/market/verbs · Id: `page:code/mcp/market/verbs`

> The Market Verbs enter as MCP do programs, with inputs, result, refusals and an example.

Reference for [Market](/business/nouns/market), one group of [Market programs](/code/mcp/market).

### Market.enter
Enter opens a Market to a Startup: Prices in its currency, the Site in its locales, and its floor rows woken. [Verb page](/business/nouns/market/enter?interface=mcp).

```text
do: return await $.Market.enter(input)
```

Emits [`Market.entered`](/business/events/Market.entered).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `startup` | [Startup](/business/nouns/startup) | Yes | The Startup that enters. |
| `market` | [Market](/business/nouns/market) | Yes | The Market to open. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `market` | [Market](/business/nouns/market) | Yes | The Market, now open to the Startup. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Market.enter({ startup: 'startup_l3hr1EnUGY', market: 'market_4uFEzN14G4' })"
  }
}
```