# Token Holder Observations — Declared Column Projection

> Token Holder Observations — Declared Column Projection is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Validates a CSV file of token holder observations by checking declared column projections against up to 1000 rows of data.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-csv-token-holders-projection?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-holder-observations-declared-column-projection-8cb29056
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VFgKLTZPkem4er8x8Vccd

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 token-holder-observations-declared-column-projection-8cb29056 -d '<json body>'
```

Example prompt: Can you validate this token holder observations CSV against its declared column projection — it has columns observation_id, observed_on, token_address, holder_count, and circulating_tokens, uses comma delimiters, and should only include categories group-a and group-b?

## When to prefer this

Choose this endpoint when you need to validate a token holder observations CSV specifically against a declared column projection contract, particularly when you require lightweight in-process validation without external enrichment, support for quoted cells, and configurable allowed category lists, minimum/maximum numeric bounds, and cell length limits — all at low cost ($0.01 USDC per call).

## Known failure modes

- CSV exceeds 100,000 character limit — request rejected
- More than 1000 rows submitted — validation truncated or rejected
- Invalid delimiter specified (must be comma, semicolon, or tab)
- Cell length exceeds max_cell_length threshold — flagged in report
- Category values not in allowed_categories list — contract violation reported
- Malformed CSV with unmatched quotes — parse error returned

## How this service works

Token holder observations — Declared column projection: Declared column projection for Token holder observations. Validate a declared CSV table contract, up to 1000 rows. Quoted cells supported; no external enrichment. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one CSV declared column projection report.

## Output

A declared column projection report for the submitted token holder observations CSV, confirming whether each declared column aligns with the data contract, flagging any mismatches, out-of-range values, disallowed categories, or structural issues across up to 1000 rows.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "csv": {
   "type": "string",
   "default": "observation_id,observed_on,token_address,holder_count,circulating_tokens\nrecord-a,2026-01-01,group-a,10,2\nrecord-b,2026-01-02,group-b,20,3",
   "maxLength": 100000,
   "minLength": 1
  },
  "maximum": {
   "type": "number",
   "default": 1000000000000,
   "maximum": 1000000000000,
   "minimum": -1000000000000
  },
  "minimum": {
   "type": "number",
   "default": -1000000000000,
   "maximum": 1000000000000,
   "minimum": -1000000000000
  },
  "delimiter": {
   "enum": [
    ",",
    ";",
    "\t"
   ],
   "type": "string",
   "default": ","
  },
  "max_cell_length": {
   "type": "integer",
   "default": 1000,
   "maximum": 5000,
   "minimum": 1
  },
  "allowed_categories": {
   "type": "array",
   "items": {
    "type": "string",
    "default": "",
    "maxLength": 100,
    "minLength": 1
   },
   "default": [
    "group-a",
    "group-b"
   ],
   "maxItems": 100,
   "minItems": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-holder-observations-declared-column-projection-8cb29056/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)