# Watchlist Diff

> Watchlist Diff is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.06/call, status unknown (last checked 2026-10-20).

Snapshots up to 10 token addresses and returns only the deltas (liquidity, price, honeypot status, sell-tax, liquidity pulls) since the last check via a watchId.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/watchlist-diff?utm_source=zero.xyz
- Price: $0.06/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/watchlist-diff-26116dc1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rzz2JvDRaKmwuo0v5xkmH

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 watchlist-diff-26116dc1
```

Example prompt: Start tracking these five token addresses for me — 0xABC..., 0xDEF..., 0x123..., 0x456..., 0x789... — and then tomorrow check them again and tell me only what changed: any liquidity moves, price swings, sell-tax spikes, or if any turned into a honeypot.

## When to prefer this

Choose this endpoint when an agent needs to repeatedly monitor a fixed set of tokens for risk changes (honeypot, liquidity pull, tax spike) without re-fetching full data each time. The delta model is ideal for daily or periodic re-checks where only changes matter, minimizing cost and noise. Prefer this over one-off token safety checks when the agent is holding positions and needs ongoing surveillance rather than a single point-in-time assessment.

## Known failure modes

- Invalid or expired watchId returns an error — watchIds may have a TTL and must be re-initialized
- More than 10 token addresses causes the request to fail or be truncated
- Invalid token address format (non-checksummed or wrong chain) returns no data for that token
- Network or RPC errors fetching on-chain state may cause partial results
- First call returns baseline only, not deltas — agent must store watchId and call again to get meaningful diff data

## How this service works

Retention in one call: pass up to 10 tokens to snapshot them and get a watchId; call again with that watchId to get only the DELTAS since last time — liquidity ±%, price ±%, became-honeypot, sell-tax spiked, liquidity pulled. The second call is worth more than the first. Built for agents holding positions that re-check daily.

## Output

On the first call (with token addresses), returns a watchId and a baseline snapshot of each token's liquidity, price, and safety status. On subsequent calls (with watchId), returns only the deltas since the last check — percentage changes in liquidity and price, newly flagged honeypot status, sell-tax spikes, and liquidity pull events. Unchanged tokens are omitted, making the second call the high-signal result.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "tokens": {
       "type": "string",
       "description": "Up to 10 token addresses (comma-separated)"
      },
      "watchId": {
       "type": "string",
       "description": "Or: watchId to re-check an existing list"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/watchlist-diff-26116dc1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)