# Token Supply Snapshots — Keyed Dataset Comparison + Explicit Missing-Value Fill

> Token Supply Snapshots — 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 2026-10-26).

Compares two token supply snapshot datasets (circulating_units or total_units) by key and fills missing values explicitly, returning 2 analytical reports for up to 200 rows.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-ib26-finance-11-190?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-supply-snapshots-keyed-dataset-comparison-explicit-missing-9eee6bca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1NJmBJQwOxgymneiPjL5j

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-supply-snapshots-keyed-dataset-comparison-explicit-missing-9eee6bca -d '<json body>'
```

Example prompt: Compare these two sets of token supply snapshots for circulating_units — the first dataset has rows for group-a and group-b from 2024-01-01 to 2024-01-10, and the second dataset has the same keys but with some missing values — give me a keyed comparison and fill in wherever values are missing.

## When to prefer this

Choose this endpoint when you have two separate token supply snapshot datasets that need row-by-row comparison on circulating or total units, particularly when you also need explicit missing-value fills identified. It is best suited for offline/batch analytical work on supplied data (up to 200 rows) without requiring live market lookups or external data enrichment. Prefer it over generic diff tools when you specifically work with token supply records keyed by instrument_group and date.

## Known failure modes

- Missing required fields (row_id, date, instrument_group) causes validation error
- More than 200 rows submitted results in rejection or truncation
- Invalid date format (not YYYY-MM-DD) causes schema validation failure
- Field value out of range (beyond ±1,000,000,000,000) rejected
- Payment of 0.01 USDC not fulfilled causes 402 response
- Empty rows array causes error
- Mismatched row counts or keys between the two datasets may produce sparse comparison output

## How this service works

Token supply snapshots — Keyed dataset comparison + Explicit missing-value fill: Keyed dataset comparison + Explicit missing-value fill for supplied token supply snapshots records (circulating_units, total_units). 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: (1) a keyed dataset comparison showing row-by-row differences between the two supplied token supply snapshot datasets on the selected field (circulating_units or total_units), and (2) an explicit missing-value fill report indicating which rows had null values and what fill values were applied, covering up to 200 rows total.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-supply-snapshots-keyed-dataset-comparison-explicit-missing-9eee6bca/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)