# Token Observed Price Change — Sequential Input-Change Attribution

> Token Observed Price Change — Sequential Input-Change Attribution 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).

Performs sequential input-change (waterfall) attribution to explain how changes in token price inputs contribute to an observed price change between two states.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-price-change-waterfall?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-sequential-input-change-attribution-b76b8d9d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jsKwV1qHkjODfWADfIo2L

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-sequential-input-change-attribution-b76b8d9d -d '<json body>'
```

Example prompt: Run a sequential input-change attribution (waterfall) on my token price data: before it was priced at 1.0 with a current price of 1.2, and after the change it went from 1.1 to 1.32 — tell me how much each input shift contributed to the overall price change.

## When to prefer this

Choose this endpoint when you need a deterministic, explainable breakdown of how individual token price inputs contributed sequentially to an observed price change — particularly for audit trails, reporting, or threshold-based decisions. Prefer this over live-scan or ML-based attribution tools when reproducibility and cost-efficiency ($0.01 USDC) matter more than real-time signals.

## Known failure modes

- Missing required fields (current_price or previous_price in before/after objects) returns a validation error
- Prices at or below zero are rejected (exclusiveMinimum: 0)
- Prices exceeding the maximum value boundary may be rejected
- Payment not processed or insufficient USDC balance blocks the request
- Identical before and after states return a zero-change attribution

## How this service works

Token observed price change — Sequential input-change attribution: Sequential input-change attribution 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 sequential input-change attribution report.

## Output

Returns a bounded sequential input-change attribution report that shows, step by step, how changing each input from its baseline to its final value contributed to the observed token price change. May include a deterministic calculation or a threshold-based verdict. Does not include live market data, safety assessments, or trade recommendations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "object",
   "default": {
    "current_price": 1.32,
    "previous_price": 1.1
   },
   "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
  },
  "before": {
   "type": "object",
   "default": {
    "current_price": 1.2,
    "previous_price": 1
   },
   "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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-observed-price-change-sequential-input-change-attribution-b76b8d9d/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)