# Video & Timecode Calc – 3:2 Pulldown Cadence Mapper

> Video & Timecode Calc – 3:2 Pulldown Cadence Mapper is a paid API for AI agents from video-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Maps 24fps film frames to their corresponding video fields and frames when telecined via 2:3 (3:2) pulldown to 29.97fps video.

## Facts

- Endpoint: GET https://video-calc.x402tookit.com/pulldown-32?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/video-timecode-calc-3-2-pulldown-cadence-mapper-35cbc056
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FHF15yBWGns8vw_LiFN_u

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 video-timecode-calc-3-2-pulldown-cadence-mapper-35cbc056
```

Example prompt: Show me the 3:2 pulldown cadence for 24 film frames starting on a 2-field frame — I need to know which video fields and frames each film frame lands in after telecine.

## When to prefer this

Use this endpoint when you need to understand or visualize the exact 3:2 pulldown cadence for a specific number of film frames — particularly useful for reverse telecine workflows, identifying mixed/interlaced frames in telecined footage, or teaching/documenting how 24fps film maps to 29.97fps NTSC video fields. Prefer this over manual calculation when you need per-frame field assignments rather than just a frame rate ratio.

## Known failure modes

- filmFrames out of range (must be 1–240) returns validation error
- startPhase not 0 or 1 causes bad request
- Missing filmFrames query parameter returns error
- Payment failure or missing x402 header returns 402 Payment Required

## How this service works

2:3 pulldown cadence: which film frames land in which video fields and frames when 24 fps film is telecined.

## Output

Returns a detailed breakdown of the 3:2 pulldown cadence including: a field sequence string (e.g. AABBBC), an array of video frame labels for each film frame, the total number of video frames and fields produced, a count of mixed frames (frames containing fields from two different film frames), the effective film and video fps after the 0.1% slowdown, and summary metadata.

## 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": [
      "filmFrames"
     ],
     "properties": {
      "filmFrames": {
       "type": "integer",
       "description": "Number of film frames to map, 1 to 240"
      },
      "startPhase": {
       "type": "integer",
       "description": "0 (default) starts on a 2-field frame; 1 starts on a 3-field frame"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "fields": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "filmFrames": {
       "type": [
        "null",
        "number"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "startPhase": {
       "type": [
        "null",
        "number"
       ]
      },
      "videoFrames": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "fieldSequence": {
       "type": [
        "null",
        "string"
       ]
      },
      "mixedFrameCount": {
       "type": [
        "null",
        "number"
       ]
      },
      "videoFrameCount": {
       "type": [
        "null",
        "number"
       ]
      },
    
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/video-timecode-calc-3-2-pulldown-cadence-mapper-35cbc056/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from video-calc.x402tookit.com](https://www.zero.xyz/host/video-calc.x402tookit.com/llms.txt)