# Transport Ridership Keyed Dataset Comparison with Missing-Value Fill

> Transport Ridership Keyed Dataset Comparison with 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 2026-10-29).

Compares two keyed transport ridership datasets (passenger_count or service_count) side by side and fills in explicit missing values, producing 2 analytical reports for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-economics-05-190?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/transport-ridership-keyed-dataset-comparison-with-missing-value-fill-f15dbd71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tZKn0AHjgSGDKP3l9IC7Z

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-keyed-dataset-comparison-with-missing-value-fill-f15dbd71 -d '<json body>'
```

Example prompt: Compare these two sets of transit ridership records for me — I have a primary dataset and a comparison dataset, each with up to 200 rows of passenger_count and service_count by region and date, and I need a keyed comparison plus explicit missing-value fill for the passenger_count field.

## When to prefer this

Choose this endpoint when you have two structured transport ridership datasets (keyed by row_id) that you want to compare field-by-field and audit for missing values — specifically for passenger_count or service_count metrics by region and date. Ideal for reconciliation tasks, data quality audits, or detecting changes between two dataset versions without needing live data, predictions, or external enrichment. Best suited for datasets up to 200 rows where a batch local computation is sufficient.

## Known failure modes

- Exceeding 200 rows causes validation rejection
- Missing required fields (row_id, region, date) in any row causes schema rejection
- Invalid date format (non-YYYY-MM-DD) causes parsing error
- Numeric values outside ±1,000,000,000,000 range rejected
- Empty rows array returns error
- Mismatched row_ids between primary and comparison datasets may result in unmatched row reports

## How this service works

Transport ridership — Keyed dataset comparison + Explicit missing-value fill: Keyed dataset comparison + 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

Two analytical reports covering: (1) a keyed row-by-row comparison of the primary and secondary ridership datasets highlighting differences in the selected field (passenger_count or service_count), and (2) explicit missing-value fill results showing which nulls were identified and how they were resolved — all computed locally with no external lookups.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/transport-ridership-keyed-dataset-comparison-with-missing-value-fill-f15dbd71/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)