# Video & Timecode Calc – Shutter Angle Converter

> Video & Timecode Calc – Shutter Angle Converter 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).

Converts shutter angle to exposure time (and back) at a given frame rate, and returns the nearest flicker-safe shutter angles for 50 Hz and 60 Hz mains power.

## Facts

- Endpoint: GET https://video-calc.x402tookit.com/shutter-angle?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-shutter-angle-converter-936074ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fPUyrtp_vQrNED6MzLjXP

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-shutter-angle-converter-936074ec
```

Example prompt: I'm shooting at 24fps and want to use a 180-degree shutter angle — what's that in actual exposure time, and what's the nearest flicker-safe angle for both 50Hz and 60Hz mains?

## When to prefer this

Use this endpoint when you need to convert between shutter angle (degrees) and actual exposure time for a specific cinema frame rate, or when you need to find the nearest flicker-safe shutter setting for 50 Hz or 60 Hz artificial lighting. It is the right choice over generic fraction calculators because it understands cinema frame rates (including drop-frame rates like 23.976 and 29.97), provides both directions of conversion, and explicitly returns optimised flicker-avoidance angles for both mains frequencies in one call.

## Known failure modes

- Missing both 'angle' and 'shutterDenominator' parameters — endpoint requires at least one
- Invalid fps value not in supported set (23.976, 24, 25, 29.97, 30, 48, 50, 59.94, 60) — may return error or default to 24
- Shutter angle of 0 or negative degrees is out of range — valid range is above 0 to 360
- Payment failure or insufficient USDC balance resulting in 402 response
- Network timeout or service unavailability

## How this service works

Convert shutter angle to exposure time (and back) at a frame rate, plus the angle that avoids 50 or 60 Hz flicker.

## Output

Returns the computed shutter angle in degrees, exposure time in seconds and milliseconds, shutter speed denominator (1/N), and frame duration in milliseconds. Also includes two flicker-safe sub-objects (one for 50 Hz, one for 60 Hz), each giving the nearest safe shutter angle, the corresponding exposure seconds, and the shutter denominator — so you can immediately dial in a safe setting on your camera.

## 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": [],
     "properties": {
      "fps": {
       "type": "string",
       "description": "Frame rate: 23.976, 24, 25, 29.97, 30, 48, 50, 59.94 or 60 (default 24)"
      },
      "angle": {
       "type": "number",
       "description": "Shutter angle in degrees, above 0 to 360 (use this or shutterDenominator)"
      },
      "shutterDenominator": {
       "type": "number",
       "description": "Shutter speed as 1/N seconds, give N (for example 48 for 1/48 s)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "fps": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "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"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "angleDegrees": {
       "type": [
        "null",
        "number"
       ]
      },
      "shutterSeconds": {
       "type": [
        "null",
        "number"
       ]
      },
      "flickerSafe50Hz": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "hz": {
         "type": [
          "null",
          "number"
         ]
        },
        "angleNearest": {
         "type": [
          "null",
      
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/video-timecode-calc-shutter-angle-converter-936074ec/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)