# LLM Cost Spike Simulator

> Free tool #6

Project how your monthly bill moves when traffic, prompt size, or output length grows — and see which lever drives it.

## Three ways to use it

**Web** — the interactive page: https://telemeter.ai/tools/cost-spike-simulator

**MCP** — a `tools/call` on the public MCP server at https://telemeter.ai/mcp (tool name: `cost-spike-simulator`), read-only, no key required.

**REST** — `POST https://telemeter.ai/api/tools/cost-spike-simulator` with a JSON body matching the input schema below:

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "model": {
      "type": "string",
      "minLength": 1
    },
    "baselineInputTokens": {
      "type": "integer",
      "minimum": 0,
      "maximum": 100000000000
    },
    "baselineOutputTokens": {
      "type": "integer",
      "minimum": 0,
      "maximum": 100000000000
    },
    "trafficMultiplier": {
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 10000
    },
    "promptMultiplier": {
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 10000
    },
    "outputMultiplier": {
      "default": 1,
      "type": "number",
      "minimum": 0,
      "maximum": 10000
    }
  },
  "required": [
    "model",
    "baselineInputTokens",
    "baselineOutputTokens",
    "trafficMultiplier",
    "promptMultiplier",
    "outputMultiplier"
  ],
  "additionalProperties": false
}
```

[Open the interactive page](https://telemeter.ai/tools/cost-spike-simulator) · [Every tool and doc, machine-readable](https://telemeter.ai/llms.txt)