# Annalist x402 Service Registry Change Tracker

> Annalist x402 Service Registry Change Tracker is a paid API for AI agents from api.annalist.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-14).

Returns a daily breakdown of new services, price changes, and payout wallet changes across the x402 paid-API ecosystem over a configurable lookback window.

## Facts

- Endpoint: GET https://api.annalist.dev/v1/checks/changes?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/annalist-x402-service-registry-change-tracker-c472a148
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lov3TGItWxMOUsouqijcu

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 annalist-x402-service-registry-change-tracker-c472a148
```

Example prompt: Show me all the x402 service registry changes from the past 7 days — new services, price raises or cuts, and any payout wallet changes — broken down by day.

## When to prefer this

Use this endpoint when you need a structured, day-by-day audit trail of changes happening across the x402 paid API ecosystem — especially for price intelligence, new service discovery cadence, or detecting suspicious wallet changes. Prefer it over general web scraping when you want signed, authoritative data about x402-listed services with a low per-call cost.

## Known failure modes

- days parameter out of range (>7 for market-wide, >30 for single host) may return validation error
- unknown or misspelled host returns empty dataset or 404
- payment not completed via x402 results in 402 response before data is returned
- stale or lagging data if registry indexing is delayed

## How this service works

Signed data for AI agents, paid per call over x402. Hyperliquid crowd state, smart money and liquidations with what historically happened next, plus independent checks of x402 services and MCP servers.

## Output

A JSON object containing an array of daily records, each with the date, the count of newly listed services, the count of price changes (broken down into raised and lowered), and the count of services that changed their payout wallet address.

## 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": "string",
       "description": "how many days back: 1 to 7 market-wide, up to 30 for one service (default 7)"
      },
      "host": {
       "type": "string",
       "description": "optional: one service by host name or URL"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "days": [
    {
     "date": "2026-10-13",
     "services_new": {
      "count": 31
     },
     "price_changes": {
      "count": 6,
      "raised": 4,
      "lowered": 2
     },
     "payout_wallet_changes": {
      "services": 0
     }
    }
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/annalist-x402-service-registry-change-tracker-c472a148/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.annalist.dev](https://www.zero.xyz/host/api.annalist.dev/llms.txt)