# x402 Data API – Price Changes

> x402 Data API – Price Changes is a paid API for AI agents from tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-25).

Returns x402 APIs whose prices have changed the most (relative change) compared to a snapshot taken N days ago, sorted by biggest mover first.

## Facts

- Endpoint: GET https://tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/v1/market/price-changes?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-data-api-price-changes-b8e1f91b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wmAbNPyy2sWS3t-JrQcM5

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 x402-data-api-price-changes-b8e1f91b
```

Example prompt: Show me the 20 x402 APIs with the biggest relative price changes compared to 14 days ago, biggest movers first.

## When to prefer this

Use this endpoint when you need to identify which x402 APIs have repriced most aggressively over a given time window. It is the right choice for price-volatility monitoring, market-change alerting, or buyer/seller intelligence on the x402 ecosystem. Prefer it over the 'popular APIs' or 'new listings' endpoints when the user's question is specifically about price movement or repricing events.

## Known failure modes

- days parameter out of range (must be 1-30) returns validation error
- limit parameter out of range (must be 1-50) returns validation error
- no price changes detected in the window returns empty results array
- upstream data unavailable returns 5xx error
- payment not sent or insufficient USDC returns 402 Payment Required

## How this service works

x402 APIs whose price changed since a snapshot taken the given number of days ago, biggest relative change first.

## Output

A ranked list of x402 API listings whose prices changed since the snapshot date, each entry showing the API details, old price, new price, and relative price change percentage, sorted descending by the magnitude of change. Also includes a total count and the snapshot comparison timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "days": {
       "type": "integer",
       "description": "compare with the snapshot from this many days ago (1-30, default 7)"
      },
      "limit": {
       "type": "integer",
       "description": "how many results (1-50, default 20)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "total": {},
      "results": {},
      "compared_with": {}
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-data-api-price-changes-b8e1f91b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws](https://www.zero.xyz/host/tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/llms.txt)