# Event Attendance Base-100 Index Series

> Event Attendance Base-100 Index Series is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Converts raw event attendance or registration counts into a base-100 indexed series for trend comparison across event types and dates.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-sector-analytics-event-attendance-index?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/event-attendance-base-100-index-series-1ccd5375
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qND_dDKzMmfkF81188NFH

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 event-attendance-base-100-index-series-1ccd5375 -d '<json body>'
```

Example prompt: Take my event attendance records — a weekly series of 'conference' and 'webinar' events from 2024-01-01 through 2024-03-31 with their registrations and attendees — and produce a base-100 index using the 'attendees' field, rebased to row 0.

## When to prefer this

Choose this endpoint when you have raw event attendance or registration data (up to 200 rows) and need to normalize it to a base-100 indexed series for trend comparison — particularly when you want local, deterministic numeric processing with no external dependencies. Ideal for dashboards, reports, or agent workflows that need to compare attendance trajectories across different event types on a common scale without forecasting or enrichment.

## Known failure modes

- Missing required fields (row_id, event_type, date, registrations, attendees) cause validation errors
- base_index out of range (exceeds number of rows supplied) returns an error
- More than 200 rows submitted exceeds the maxItems limit and is rejected
- Null values in the selected field (registrations or attendees) at the base row may cause division errors or undefined output
- Malformed date strings not matching YYYY-MM-DD pattern are rejected

## How this service works

Event attendance - Base-100 series: Base-100 series for Event attendance. Up to 200 supplied typed records. Local numeric and data-quality processing; no external enrichment or forecasting. One of 25 profiles or calculations across 20 shared operations in this sector. 0.01 USDC includes one bounded base-100 series deliverable.

## Output

Returns a base-100 indexed series derived from the supplied event attendance or registration data, where each row's value is expressed relative to the selected base row (base_index). Output includes normalized index values per row, enabling direct comparison of relative trends across event types and dates without external enrichment or forecasting.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "row_id",
     "event_type",
     "date",
     "registrations",
     "attendees"
    ],
    "properties": {
     "date": {
      "type": "string",
      "default": "",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "maxLength": 10
     },
     "row_id": {
      "type": "string",
      "default": "",
      "maxLength": 80,
      "minLength": 1
     },
     "attendees": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     },
     "event_type": {
      "type": "string",
      "default": "",
      "maxLength": 80
     },
     "registrations": {
      "type": [
       "number",
       "null"
      ],
      "maximum": 1000000000000,
      "minimum": -1000000000000
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "date": "2026-10-01",
     "row_id": "row-1",
     "attendees": 1,
     "event_type": "group-a",
     "registrations": 10
    },
    {
     "date": "2026-10-02",
     "row_id": "row-2",
     "attendees": 2,
     "event_type": "group-b",
     "registrations": 20
    },
    {
     "date": "2026-10-03",
     "row_id": "row-3",
     "attendees": 3,
     "event_type": "group-a",
     "registrations": 15
    },
    {
     "date": "2026-10-04",
     "row_id": "row-4",
     "attendees": 4,
     "event_type": "group-b",
     "registrations": 30
    }
   ],
   "maxItems": 200,
   "minItems": 1
  },
  "field": {
   "enum": [
    "registrations",
    "attendees"
   ],
   "type": "string",
   "default": "registrations"
  },
  "base_index": {
   "type": "integer",
   "default": 0,
   "maximum": 199,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/event-attendance-base-100-index-series-1ccd5375/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)