# Research Task Completion — Category Frequencies + Adjacent Row Changes

> Research Task Completion — Category Frequencies + Adjacent Row Changes is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Analyzes research task completion records to produce two reports: category frequency counts by company group and adjacent-row delta changes for completed_tasks or assigned_tasks, for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-company-22-104?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/research-task-completion-category-frequencies-adjacent-row-changes-b441250c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rxNODecr3JnzOB1PDb1qt

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 research-task-completion-category-frequencies-adjacent-row-changes-b441250c -d '<json body>'
```

Example prompt: Can you analyze my research task completion records for up to 50 rows — I need two reports: one showing how often each company_group appears (category frequencies) and one showing the day-to-day changes in completed_tasks between adjacent rows?

## When to prefer this

Choose this endpoint when you need both a group-level frequency summary and a sequential change analysis on research task completion data in a single low-cost call. It is ideal for small-to-medium datasets (up to 200 rows) where you want offline, deterministic analytics without any external API calls, predictions, or live data lookups. Prefer it over generic analytics tools when your data already conforms to the completed_tasks/assigned_tasks schema and you want both reports bundled for $0.01.

## Known failure modes

- Rows array empty or missing — returns validation error
- More than 200 rows supplied — rejected with maxItems error
- Invalid date format (not YYYY-MM-DD) — schema validation failure
- Field value not in enum ['completed_tasks','assigned_tasks'] — rejected
- Null values in the selected numeric field may produce null deltas in the change report
- Missing required fields (row_id, company_group, date) — schema validation error

## How this service works

Research task completion — Category frequencies + Adjacent row changes: Category frequencies + Adjacent row changes for supplied research task completion records (completed_tasks, assigned_tasks). 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: (1) a category frequency table showing how often each company_group value appears in the supplied rows, and (2) an adjacent row change report showing the numeric difference in the selected field (completed_tasks or assigned_tasks) between each consecutive row, all computed locally without external lookups.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/research-task-completion-category-frequencies-adjacent-row-changes-b441250c/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)