# B20 Token Freeze Check

> B20 Token Freeze Check 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).

Checks whether a specific wallet is authorized under a B20 token's transfer-sender policy, determining if it can be seized or frozen by the token issuer.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/b20-freeze-check
- 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-freeze-check-e9dc1a27
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JHPgBpUHqflrjx7p8BmLH

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-freeze-check-e9dc1a27
```

Example prompt: Can you check whether my wallet 0xAbC123...def is authorized under the B20 token at address 0x456...789 — specifically, could the issuer freeze or seize my funds?

## When to prefer this

Use this endpoint when a user needs to know specifically whether their wallet can be frozen or seized by a B20 token issuer on Base, particularly before acquiring or holding a B20 token. Prefer this over generic token safety checks when the concern is about transfer restrictions and personal fund seizure risk rather than general contract audits.

## Known failure modes

- Invalid token address returns an error or empty result
- Invalid wallet address format causes a 400-level response
- Token address is not a B20 token and policy lookup fails
- Network or upstream RPC unavailability causes a timeout
- Missing required query parameters (token or wallet) returns a validation error

## How this service works

Checks whether a specific wallet is authorized under a B20 token's transfer-sender policy. If it isn't, that wallet can't transfer and can be burnBlocked() (SEIZED) by the issuer. The personal companion to b20-safety — 'can this token freeze MY funds?'

## Output

Returns whether the specified wallet is authorized under the B20 token's transfer-sender policy, indicating if the wallet can transfer the token or is at risk of being burnBlocked (SEIZED) by the issuer.

## 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": [
      "token",
      "wallet"
     ],
     "properties": {
      "token": {
       "type": "string",
       "description": "B20 token address"
      },
      "wallet": {
       "type": "string",
       "description": "Your wallet 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-freeze-check-e9dc1a27/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)