# Cooking Calculators – Yeast & Sourdough Converter

> Cooking Calculators – Yeast & Sourdough Converter is a paid API for AI agents from cooking-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Converts between fresh, active-dry, and instant yeast amounts, splits a sourdough starter into flour and water components, or plans a sourdough starter feed schedule.

## Facts

- Endpoint: GET https://cooking-calc.x402tookit.com/yeast-sourdough?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/cooking-calculators-yeast-sourdough-converter-68851080
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NKWJujQKSLag38sQGA0Pj

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 cooking-calculators-yeast-sourdough-converter-68851080
```

Example prompt: I have a bread recipe that calls for 15g of fresh yeast — how much active-dry yeast should I use instead?

## When to prefer this

Choose this endpoint when an agent needs precise, authoritative gram-based yeast conversions or sourdough starter math rather than relying on approximate rules of thumb. It is the right choice specifically for yeast-type substitutions (fresh/active-dry/instant), starter hydration breakdowns, and feed planning with ratio control — all in a single call with a structured, parseable response.

## Known failure modes

- Missing required 'mode' query parameter returns an error
- Invalid mode value (not 'yeast', 'starter', or 'feed') causes rejection
- Invalid yeast type for 'from' or 'to' (not fresh/active-dry/instant) causes error
- Missing 'amountG' in yeast mode or 'starterG' in starter mode causes incomplete response
- Malformed ratio string in feed mode (e.g. non-numeric parts) may cause calculation failure
- Payment failure results in 402 response before computation

## How this service works

Convert fresh, active dry and instant yeast, split a sourdough starter into flour and water, or plan a starter feed.

## Output

Returns a JSON object with the computed result in grams (resultG), the input amount (amountG), the source and target yeast types or mode, a human-readable summary, relative strength figures comparing yeast types, and a disclaimer noting any caveats. For starter and feed modes, it breaks out flour and water components and explains the calculation.

## 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": [
      "mode"
     ],
     "properties": {
      "to": {
       "type": "string",
       "description": "yeast mode: fresh, active-dry or instant"
      },
      "from": {
       "type": "string",
       "description": "yeast mode: fresh, active-dry or instant"
      },
      "mode": {
       "type": "string",
       "description": "yeast, starter or feed"
      },
      "ratio": {
       "type": "string",
       "description": "feed mode: starter:flour:water parts, for example 1:2:2 (default 1:1:1)"
      },
      "amountG": {
       "type": "number",
       "description": "yeast mode: the yeast amount in grams"
      },
      "targetG": {
       "type": "number",
       "description": "feed mode: total weight wanted after feeding, in grams"
      },
      "starterG": {
       "type": "number",
       "description": "starter mode: starter weight in grams"
      },
      "hydrationPct": {
       "type": "number",
       "description": "starter and feed modes: starter hydration, water as % of flour (default 100)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "to": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "from": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "amountG": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "resultG": {
       "type": [
        "null",
        "number"
       ]
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cooking-calculators-yeast-sourdough-converter-68851080/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cooking-calc.x402tookit.com](https://www.zero.xyz/host/cooking-calc.x402tookit.com/llms.txt)