# Token Observed Price Change — Local Finite-Change Elasticity

> Token Observed Price Change — Local Finite-Change Elasticity 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).

Computes the local finite-change elasticity of a token's observed price change given two price observations and a step size.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-price-change-elasticity?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-local-finite-change-elasticity-9d5dee1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_asg4BiNJU5ae12CPMh7eM

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-local-finite-change-elasticity-9d5dee1b -d '<json body>'
```

Example prompt: Calculate the local finite-change elasticity for a token that moved from a previous price of 1.00 to a current price of 1.20, using a step size of 1% on the current_price field.

## When to prefer this

Choose this endpoint when you need a fast, deterministic, single-call elasticity metric derived purely from two supplied token price observations and a configurable step percentage. It is well-suited for agents performing quantitative price sensitivity analysis, building risk models, or evaluating token price responsiveness without requiring live market feeds or probabilistic models.

## Known failure modes

- Missing or zero-value prices cause validation errors since both current_price and previous_price must be strictly positive
- step_percent outside the allowed 0.01–10 range returns a validation error
- Omitting both baseline prices falls back to defaults which may not reflect the caller's intended scenario
- Payment failure or insufficient USDC balance results in a 402 response and no report is generated

## How this service works

Token observed price change — Local finite-change elasticity: Local finite-change elasticity 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 local finite-change elasticity report.

## Output

A deterministic local finite-change elasticity report for the supplied token price observations. The report quantifies how the observed price change responds to a small finite step in the chosen field (current_price or previous_price), expressed as a bounded elasticity value derived from the baseline prices and step percentage. No live market data, trade recommendations, or safety guarantees are included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "field": {
   "enum": [
    "current_price",
    "previous_price"
   ],
   "type": "string",
   "default": "current_price"
  },
  "baseline": {
   "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
  },
  "step_percent": {
   "type": "number",
   "default": 1,
   "maximum": 10,
   "minimum": 0.01
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-observed-price-change-local-finite-change-elasticity-9d5dee1b/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)