# B20 Token Policy Watch — Seizable State Detector

> B20 Token Policy Watch — Seizable State Detector is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Fetches the full policy/pause event timeline and live policy state for a B20 token to determine if and exactly when it became seizable via sender blocklist attachment.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/b20-policy-watch
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/b20-token-policy-watch-seizable-state-detector-e7c1bde1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nUzGAKiBCC2qM64y-bpZp

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 b20-token-policy-watch-seizable-state-detector-e7c1bde1
```

Example prompt: Can you check the full policy event history for this B20 token at 0x1234...abcd and tell me if it's ever become seizable — and exactly when the sender blocklist was attached if so?

## When to prefer this

Use this endpoint specifically when auditing B20 tokens on Base for the rug vector where a token launches clean and later silently attaches a sender blocklist to enable seizure via burnBlocked. It provides both historical event timelines and live state, unlike generic token security scanners that only check current state.

## Known failure modes

- Invalid or non-B20 token address returns an error or empty result
- Address is valid but has no policy events indexed yet
- CDP indexing lag causes missing recent events
- Network timeout if Base RPC is slow
- Non-Base chain addresses may not be supported

## How this service works

The B20-only rug vector: a token can launch clean and later attach a sender blocklist (PolicyUpdated) — silently becoming seizable via burnBlocked. This reads the token's full policy/pause event timeline (CDP-indexed onchain events) plus the live policy state, and tells you if — and exactly WHEN — it turned seizable.

## Output

Returns the complete CDP-indexed onchain policy and pause event timeline for the given B20 token address, the current live policy state, a seizability verdict, and the precise timestamps of any PolicyUpdated events that enabled burnBlocked/sender blocklisting.

## 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": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "B20 token address"
      }
     }
    }
   },
   "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/b20-token-policy-watch-seizable-state-detector-e7c1bde1/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)