# Token Observed Price Change — Record Ranking

> Token Observed Price Change — Record Ranking is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Ranks a supplied list of token price-change observations by their observed price change, returning a deterministic record-ranking report.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-price-change-rank?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-observed-price-change-record-ranking-151ae6dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k8O5My6FdheVniDXkfVhm

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-observed-price-change-record-ranking-151ae6dc -d '<json body>'
```

Example prompt: Can you rank these token price observations by how much they changed? I have four tokens: one went from 1.00 to 1.20, another from 1.10 to 1.32, another from 2.00 to 1.80, and one from 0.50 to 0.75.

## When to prefer this

Use this endpoint when you have a fixed set of token price observations (current and previous price pairs) and need a deterministic ranking of those records by price change. It is ideal for portfolio screens, leaderboard generation, and batch comparison tasks where you supply the data and want an ordered ranking without any live market scanning or external data enrichment.

## Known failure modes

- Fewer than 2 rows supplied — minimum of 2 rows required
- More than 200 rows supplied — maximum is 200
- Any price value is zero or negative — both current_price and previous_price must be greater than 0
- Malformed input schema — missing required current_price or previous_price fields
- Payment not processed — x402 payment of 0.01 USDC must succeed before result is returned

## How this service works

Token observed price change — Record ranking: Record ranking for Token observed price change. Supplied token observations only. Deterministic calculation or caller-threshold verdict, not a live scan, safety proof or trade recommendation. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded record ranking report.

## Output

A bounded record-ranking report listing the supplied token price observations ordered by their computed price change, calculated deterministically from the provided current and previous price pairs. No live market data, safety assessment, or trade recommendation is included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "current_price",
     "previous_price"
    ],
    "properties": {
     "current_price": {
      "type": "number",
      "default": 1.2,
      "maximum": 10000000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     },
     "previous_price": {
      "type": "number",
      "default": 1,
      "maximum": 10000000000000000,
      "minimum": 0,
      "exclusiveMinimum": 0
     }
    },
    "additionalProperties": false
   },
   "default": [
    {
     "current_price": 1.2,
     "previous_price": 1
    },
    {
     "current_price": 1.32,
     "previous_price": 1.1
    },
    {
     "current_price": 1.2,
     "previous_price": 1
    },
    {
     "current_price": 1.32,
     "previous_price": 1.1
    }
   ],
   "maxItems": 200,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-observed-price-change-record-ranking-151ae6dc/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)