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

# evaluate_belief_scenario

> Test case assumptions

**Test case assumptions** · \$0.02 per call (x402, USDC)

Apply up to eight hypothetical condition assumptions to a case's recorded scenario model. Does not alter evidence or predict the investor's response.

## Input parameters

| Parameter | Type | Required | Description |
| - | - | - | - |
| `belief_id` | string | Yes | min length 1; max length 128 |
| `as_of` | string | No | |
| `scenario` | object | Yes | |

## Transports

* **MCP:** `tools/call` with name `evaluate_belief_scenario` at `https://beliefstate.ai/mcp` (account access) or the wallet-paid x402 MCP server. See [MCP integration](https://docs.beliefstate.ai/guides/mcp-server.md).
* **x402 HTTP:** `POST https://beliefstate.ai/v1/research/evaluate_belief_scenario` with the arguments as a JSON body. An unpaid request returns an HTTP 402 payment quote.
* **Related REST resource:** [`GET /v1/beliefs`](https://docs.beliefstate.ai/api-reference/beliefs/find-investor-beliefs-or-inspect-a-full-record).

## Example request

### MCP

```json theme={null}
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "evaluate_belief_scenario",
    "arguments": {
      "belief_id": "00000000-0000-4000-8000-000000000001",
      "scenario": {
        "assumptions": [
          {
            "condition_id": "example-condition",
            "status": "met"
          }
        ]
      }
    }
  }
}
```

### x402 HTTP

```bash theme={null}
curl --request POST \
  --url 'https://beliefstate.ai/v1/research/evaluate_belief_scenario' \
  --header 'Content-Type: application/json' \
  --data '{"belief_id":"00000000-0000-4000-8000-000000000001","scenario":{"assumptions":[{"condition_id":"example-condition","status":"met"}]}}'
```

The example shows request shape only. Identifiers are placeholders, not records.

## Related

* [All research tools](https://docs.beliefstate.ai/tools/index.md)
* [API reference: GET /v1/beliefs](https://docs.beliefstate.ai/api-reference/beliefs/find-investor-beliefs-or-inspect-a-full-record.md)


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