# Sports Calculators – Darts Checkout Routes

> Sports Calculators – Darts Checkout Routes 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).

Returns the fewest-dart checkout route(s) for a given remaining darts score (2–170), finishing on a double, with alternative routes.

## Facts

- Endpoint: GET https://sports-calc.x402tookit.com/darts-checkout?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-darts-checkout-routes-7415db0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I78v0AKS-qNRzRMK7YdK2

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-darts-checkout-routes-7415db0d
```

Example prompt: What's the best darts checkout route for a remaining score of 121 — show me the fewest darts needed and any alternative finishes?

## When to prefer this

Choose this endpoint when you need authoritative darts checkout routes — optimal dart sequences finishing on a double — for any standard remaining score from 2 to 170. It provides both the minimum-dart solution and alternatives in a single call, making it ideal for coaching tools, darts scorekeeping apps, or in-game advisory agents.

## Known failure modes

- Score outside 2–170 range returns an error or empty routes
- Scores that cannot be finished on a double (e.g. 1 or 169 or 168) may return no valid routes
- Network timeout or service unavailability returns a non-200 status
- Missing required 'score' query parameter causes a validation error

## How this service works

Darts checkout routes for a remaining score of 2 to 170: the fewest darts that finish on a double, with alternatives.

## Output

Returns the minimum number of darts required to check out, one or more ordered dart sequences (e.g. ['T20','T17','D18']), a route count, a plain-text summary and verdict, and optional metadata like source, timestamp, and degraded-mode flags.

## 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": [
      "score"
     ],
     "properties": {
      "score": {
       "type": "integer",
       "description": "Remaining score, 2 to 170"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "score": {
       "type": [
        "null",
        "number"
       ]
      },
      "routes": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "text": {
          "type": [
           "null",
           "string"
          ]
         },
         "darts": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": "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"
       }
      },
      "routeCount": {
       "type": [
        "null",
        "number"
       ]
      },
      "dartsNeeded": {
       "type": [
        "null",
        "number"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sports-calculators-darts-checkout-routes-7415db0d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
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