# Inflation Calculator — REST API endpoint `inflation-calculator`

Return what an amount of money from one year is worth in another year using historical CPI data, with total inflation, average yearly inflation, and the change in purchasing power (all in percent). USD covers 1913-2025 (BLS); TRY covers 2003-2025 (TÜİK).

- Category: finance
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, API key for tools/call, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/inflation-calculator/execute (API key, 60 req/min per IP)
- API key: Running a tool needs an API key. Keys are not for sale yet: ask for early access. Without a key, a tool call answers HTTP 402 Payment Required with the error code PAYMENT_REQUIRED. The catalog and the schemas stay open without a key. https://findutils.com/api/#api-keys
- Reference page: https://findutils.com/api/inflation-calculator/
- Same tool on the other surface: https://findutils.com/mcp/inflation-calculator/

## Call the endpoint (verified example)

```bash
curl -X POST https://api.findutils.com/api/tools/inflation-calculator/execute \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 100,
    "from_year": 2000,
    "to_year": 2025,
    "currency": "USD"
  }'

# Parameter schema (no key needed)
curl https://api.findutils.com/api/tools/inflation-calculator
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `amount` | number | yes | Amount of money in the from_year. |
| `from_year` | integer | yes | Start year. |
| `to_year` | integer | yes | End year. May be earlier than from_year. |
| `currency` | string (USD \| TRY) | no | CPI series: USD or TRY. Default: USD. |

Example arguments (verified):

```json
{
  "amount": 100,
  "from_year": 2000,
  "to_year": 2025,
  "currency": "USD"
}
```

OpenAPI 3.1 spec: https://findutils.com/api/openapi.json · Interactive docs: https://findutils.com/api/docs/

## Also an MCP tool

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/ --header "Authorization: Bearer YOUR_API_KEY"
```

Then ask the client to call `findutils:inflation_calculator`. Full MCP reference: https://findutils.com/mcp/inflation-calculator/

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