# Transport Ridership Equal-Width Histogram and Missing-Value Fill

> Transport Ridership Equal-Width Histogram and Missing-Value Fill is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-26).

Generates an equal-width histogram and fills missing values for transport ridership data (passenger_count and service_count) across up to 200 rows, producing two analytical reports in a single call.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-economics-05-175?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/transport-ridership-equal-width-histogram-and-missing-value-fill-745545d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VIK6ta0GzNu4Ql62YiLJB

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 transport-ridership-equal-width-histogram-and-missing-value-fill-745545d7 -d '<json body>'
```

Example prompt: I have 150 rows of bus ridership records with some null passenger_count values — can you fill in the missing values using median imputation and also generate a 10-bin equal-width histogram for passenger_count?

## When to prefer this

Choose this endpoint when you need both a distribution summary (histogram) and missing-value imputation for transport ridership data (passenger_count or service_count) in a single low-cost call. It is ideal for offline, batch analytical tasks on up to 200 rows where no live data lookups, predictions, or external integrations are needed. Prefer this over generic statistics APIs when you specifically have transit ridership records with the required schema fields (row_id, region, date, passenger_count, service_count).

## Known failure modes

- Rows exceed 200 item limit — request will be rejected
- Invalid date format (not YYYY-MM-DD) causes row validation failure
- bins value outside 1–30 range causes schema validation error
- All values null for selected field may produce degenerate histogram
- row_id missing or empty causes required-field validation error
- Numeric values outside ±1,000,000,000,000 are rejected

## How this service works

Transport ridership — Equal-width histogram + Explicit missing-value fill: Equal-width histogram + Explicit missing-value fill for supplied transport ridership records (passenger_count, service_count). Up to 200 rows; 2 independent reports using shared local analytical engines. No live lookup, prediction, professional assessment or external action. 0.01 USDC includes 2 supplied-data reports for up to 200 rows.

## Output

Returns two analytical reports: (1) an equal-width histogram showing bin edges and counts for the selected field, and (2) a version of the input records with missing values for the selected field filled using the chosen method (zero, mean, or median). Both reports are computed locally without external data lookups.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "bins": {
   "type": "integer",
   "default": 5,
   "maximum": 30,
   "minimum": 1
  },
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "region",
     "date",
     "passenger_count",
     "service_count"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "region": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "service_count": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "passenger_count": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "region": "group-a",
     "row_id": "row-1",
     "service_count": 1,
     "passenger_count": 10
    },
    {
     "date": "2026-10-02",
     "region": "group-b",
     "row_id": "row-2",
     "service_count": 2,
     "passenger_count": 20
    },
    {
     "date": "2026-10-03",
     "region": "group-a",
     "row_id": "row-3",
     "service_count": 3,
     "passenger_count": 15
    },
    {
     "date": "2026-10-04",
     "region": "group-b",
     "row_id": "row-4",
     "service_count": 4,
     "passenger_count": 30
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "passenger_count",
    "service_count"
   ],
   "type": "string",
   "default": "passenger_count"
  },
  "method": {
   "enum": [
    "zero",
    "mean",
    "median"
   ],
   "type": "string",
   "default": "median"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/transport-ridership-equal-width-histogram-and-missing-value-fill-745545d7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)