---
title: "Inputs and outputs of configured calculations"
method: POST
path: "/model_builders/calculations/io"
tags: ["Model builders"]
---

# Inputs and outputs of configured calculations

`POST /model_builders/calculations/io`

## Request

- Base URL: `https://api.ionworks.com`
- URL: `https://api.ionworks.com/model_builders/calculations/io`
- Auth: none declared

What each calculation consumes and produces; an invalid one reports an error.

## Request body

- CalculationIORequest: Calculations to describe, in one round trip.
  - `calculations` CalculationSpec[], required
    - `type` string, required
    - `options` object

## Response `200`

Successful Response

- CalculationIO[]
  - `inputs` string[]
  - `outputs` string[]
  - `error` string, nullable

## Other responses

- `422`: Validation Error

## Changes

- **2026-10-22** `39d84bb8875e`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/ionworks/apis/ionworks-api/changes/model_builders/calculations/io/post.md)

---

[API](https://skmtc.dev/ionworks/apis/ionworks-api.md) - [All operations](https://skmtc.dev/ionworks/apis/ionworks-api/llms.txt) - [OpenAPI document](https://skmtc.dev/ionworks/apis/ionworks-api/revisions/abebbbc5f60a?raw)