# Fact Check Workflow — Keyed Dataset Comparison + Explicit Missing-Value Fill

> Fact Check Workflow — Keyed Dataset Comparison + Explicit 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 2026-10-30).

Compares two keyed fact-check workflow datasets (claims reviewed vs references collected) row-by-row and fills missing values, producing two analytical reports for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-news-18-190?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fact-check-workflow-keyed-dataset-comparison-explicit-missing-value-b17aa008
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ss_z6Tv6A6wsbOZ5bCAgF

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 fact-check-workflow-keyed-dataset-comparison-explicit-missing-value-b17aa008 -d '<json body>'
```

Example prompt: Compare these two batches of fact-check workflow records — one is my primary dataset and the other is the comparison set — keyed by row_id and channel_group, fill in any missing claims_reviewed values, and give me both analytical reports. I have up to 80 rows in each batch.

## When to prefer this

Choose this endpoint when you need offline, deterministic keyed comparison between two structured fact-check workflow datasets without any live external lookups or model inference. It is ideal for data-quality workflows in journalism or media organizations that need to reconcile two versions of fact-check tracking records and explicitly handle nulls. At $0.01 USDC for two reports covering up to 200 rows, it is cost-efficient for batch reconciliation tasks. Prefer alternatives if you need real-time claim verification, web search, or AI-based fact assessment.

## Known failure modes

- More than 200 rows submitted — payload rejected with validation error
- Missing required fields (row_id, channel_group, date, claims_reviewed, references_collected) in any row — schema validation failure
- Invalid date format (must be YYYY-MM-DD) — pattern validation error
- No matching keys between primary and secondary datasets — comparison report shows zero matched rows
- Payment not included or invalid x402 payment header — 402 Payment Required response

## How this service works

Fact check workflow — Keyed dataset comparison + Explicit missing-value fill: Keyed dataset comparison + Explicit missing-value fill for supplied fact check workflow records (claims_reviewed, references_collected). 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 independent analytical reports generated by local engines: a keyed dataset comparison report showing row-by-row differences between the primary and secondary datasets (matched on row_id), and an explicit missing-value fill report detailing how null claims_reviewed or references_collected values were handled. Reports cover up to 200 rows and include per-row and per-channel-group breakdowns.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fact-check-workflow-keyed-dataset-comparison-explicit-missing-value-b17aa008/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)