# Sports Calculators – Betting Odds Converter & Kelly Calculator

> Sports Calculators – Betting Odds Converter & Kelly Calculator is a paid API for AI agents from sports-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Converts betting odds between American, decimal, fractional, and probability formats; optionally computes bookmaker margin and Kelly Criterion stake fraction.

## Facts

- Endpoint: GET https://sports-calc.x402tookit.com/betting-odds?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/sports-calculators-betting-odds-converter-kelly-calculator-6221478d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NgtS2XT2jqsSB0mIwwFtU

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 sports-calculators-betting-odds-converter-kelly-calculator-6221478d
```

Example prompt: Convert American odds of -110 to decimal and fractional formats, show me the implied probability, and since the other side is also -110 tell me what the bookmaker's margin is.

## When to prefer this

Choose this endpoint when you need fast, pure-math odds conversion or Kelly sizing without any live data feed. It is ideal for pre-bet analysis, building a parlay calculator, checking bookmaker fairness, or sizing wagers from a bankroll management model. It is NOT appropriate for fetching live odds from a sportsbook — it only does mathematical transformation of odds you already have.

## Known failure modes

- Missing required 'odds' or 'format' query parameters returns an error
- Odds value inconsistent with stated format (e.g. a negative decimal) causes a validation error
- 'otherSideOdds' in a different format than 'format' produces incorrect margin
- yourProbability outside [0,1] returns a validation error
- Very long or non-numeric odds strings may be rejected

## How this service works

Convert American, decimal, fractional odds and probability; add the other side for margin, or your own chance for Kelly.

## Output

Returns the odds expressed in all four formats (American, decimal, fractional, probability), the implied probability, the no-vig fair probability, profit per 100 stake, and — when the other side's odds are supplied — the overround/bookmaker margin percentage and no-vig probability for both sides. If a personal win probability is supplied, a Kelly Criterion fraction is also included.

## 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": [
      "odds",
      "format"
     ],
     "properties": {
      "odds": {
       "type": "string",
       "description": "The odds, e.g. -110, 2.5, 5/2 or 0.4"
      },
      "format": {
       "type": "string",
       "description": "american, decimal, fractional or probability"
      },
      "otherSideOdds": {
       "type": "string",
       "description": "Odds of the opposing outcome in the same format, to measure the bookmaker margin"
      },
      "yourProbability": {
       "type": "number",
       "description": "Your own win probability 0 to 1, for the Kelly fraction"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "decimal": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "american": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "overround": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "fractional": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "noVigProbability": {
       "type": [
        "null",
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sports-calculators-betting-odds-converter-kelly-calculator-6221478d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sports-calc.x402tookit.com](https://www.zero.xyz/host/sports-calc.x402tookit.com/llms.txt)