# Tire Size Price History – Daily Series

> Tire Size Price History – Daily Series is a paid API for AI agents from tiresapi.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-13).

Returns a daily price series (avg, min, max, median, listings count) for a specific tire size over up to 365 days, optionally scoped by US state or Nielsen DMA code.

## Facts

- Endpoint: GET https://tiresapi.com/api/v1/corpus/price-history/size?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tiresapi-com-2c9fc22a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_G80Flb-djK3dFxF6eLBHU

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 tiresapi-com-2c9fc22a
```

Example prompt: Can you pull the daily price history for 235/55R17 tires over the last 90 days, filtered to the state of Texas, so I can see how average and median prices have trended?

## When to prefer this

Use this endpoint when you need a time-series view of tire prices for a specific size (not a specific SKU/brand) to analyze trends, volatility, or regional pricing differences over days to months. Prefer the SKU-based price-history endpoint when you have a specific key_brand_mpc. Use this size-based endpoint for broader market trend analysis, insurance severity studies, or regional price band research.

## Known failure modes

- Missing required tire_size parameter returns a 400 validation error
- Invalid tire size format (e.g. missing slash or R prefix) may return empty results or 422
- State code not matching ^[A-Z]{2}$ pattern returns a 400 schema validation error
- days value outside 1-365 range returns a 400 validation error
- Unknown DMA code may return empty data set (auto-credited)
- No data available for the requested size/region/date range returns empty data array with count 0

## How this service works

Daily price series for one tire size over up to 365 days.

## Output

An array of daily records each containing utc_date, avg_price, min_price, max_price, median_price, listings count, and sample_rows, plus top-level metadata including tire_size, days requested, total count, and optional state/dma_code filters applied.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "days": 90,
   "state": "TX",
   "tire_size": "235/55R17"
  }
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "tire_size"
     ],
     "properties": {
      "days": {
       "type": "integer",
       "default": 90,
       "maximum": 365,
       "minimum": 1
      },
      "state": {
       "type": "string",
       "pattern": "^[A-Z]{2}$"
      },
      "dma_code": {
       "type": "string",
       "maxLength": 5,
       "description": "Nielsen DMA code (TV market = retail competition cluster). Orthogonal to `state` — pin one or both. Use to scope the series to a single metro for regional pricing / insurance-severity questions."
      },
      "tire_size": {
       "type": "string",
       "description": "Tire size, e.g. '235/55R17'."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "data",
      "count",
      "tire_size",
      "days"
     ],
     "properties": {
      "data": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "listings": {
          "type": "integer"
         },
         "utc_date": {
          "type": "string",
          "format": "date"
         },
         "avg_price": {
          "type": "number"
         },
         "max_price": {
          "type": "number"
         },
         "min_price": {
          "type": "number"
         },
         "sample_rows": {
          "type": "integer"
         },
         "median_price": {
          "type": "number"
         }
        }
       }
      },
      "days": {
       "type": "integer"
      },
      "count": {
       "type": "integer"
      },
      "state": {
       "type": [
        "string",
        "null"
       ]
      },
      "dma_code": {
       "type": [
        "string",
        "null"
       ]
      },
      "tire_size": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [
   {
    "listings": 412,
    "utc_date": "2026-05-19",
    "max_price": 198.99,
    "min_price": 128.99,
    "median_price": 152.99
   }
  ],
  "days": 90,
  "count": 90,
  "state": "FL",
  "dma_code": "539",
  "tire_size": "235/55R17"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tiresapi-com-2c9fc22a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tiresapi.com](https://www.zero.xyz/host/tiresapi.com/llms.txt)