# Paper & Print Calc – ISO 216 Paper Size Lookup

> Paper & Print Calc – ISO 216 Paper Size Lookup is a paid API for AI agents from paper-print-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Returns ISO 216 paper dimensions in mm, inches, and points for any A, B, or C series size (0–10), plus area, aspect ratio, and neighboring sizes.

## Facts

- Endpoint: GET https://paper-print-calc.x402tookit.com/iso-paper?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/paper-print-calc-iso-216-paper-size-lookup-9d5e0ca9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wmgQpasm_TaRlWdZ79Uic

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability paper-print-calc-iso-216-paper-size-lookup-9d5e0ca9
```

Example prompt: What are the dimensions of A4 paper — can you give me the width and height in mm, inches, and points, and also tell me what the next larger and next smaller sizes are?

## When to prefer this

Use this endpoint when you need precise ISO 216 standard paper dimensions across multiple unit systems (mm, inches, points) in a single call, especially when you also need neighboring sizes or area — ideal for print production, document layout, and typographic workflows. Prefer this over manual lookup tables when building automated print-spec pipelines or design tools.

## Known failure modes

- Missing required 'series' or 'size' query parameter returns an error
- Invalid series value (not A, B, or C) returns an error
- Size number outside 0–10 range returns an error or null result
- Edge sizes (e.g. A0 or A10) may return null for the next larger or next smaller neighbor respectively

## How this service works

ISO 216 size in mm, inches and points for A0-A10, B0-B10, C0-C10, with area, aspect ratio and the neighbouring sizes.

## Output

A JSON object containing the paper size name, width and height in millimeters, inches, and typographic points, the area in square meters, the aspect ratio, and objects describing the next larger and next smaller sizes (each with name, width, and height).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "series",
      "size"
     ],
     "properties": {
      "size": {
       "type": "integer",
       "description": "Size number 0 to 10 (A4 is series A, size 4)"
      },
      "series": {
       "type": "string",
       "description": "A, B or C"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "name": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "widthMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "heightMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "nextLarger": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "name": {
         "type": [
          "null",
          "string"
         ]
        },
        "width": {
         "type": [
          "null",
          "number"
         ]
        },
        "height": {
         "type": [
          "null",
          "number"
         ]
        }
       }
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "aspectRatio": {
       "type": [
        "null",
        "number"
   
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/paper-print-calc-iso-216-paper-size-lookup-9d5e0ca9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from paper-print-calc.x402tookit.com](https://www.zero.xyz/host/paper-print-calc.x402tookit.com/llms.txt)