# Base Token Control-Risk Screen

> Base Token Control-Risk Screen is a paid API for AI agents from heb-utils-x402.hebutils-api.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).

Screens a Base chain token contract address for control-risk signals (e.g. upgradeable proxy, ownership concentration) and returns a verdict with flags and token metadata.

## Facts

- Endpoint: GET https://heb-utils-x402.hebutils-api.workers.dev/base-token-check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-token-control-risk-screen-0a3b23c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_24JkodC226UGp_ejLK6AA

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 base-token-control-risk-screen-0a3b23c8
```

Example prompt: Can you screen the Base token at contract address 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA for control risks — I want to know if it has any upgradeable proxy flags or other centralization signals before I interact with it.

## When to prefer this

Use this endpoint when you need a fast, structured risk-signal summary for a specific Base token contract address — particularly to surface control risks like upgradeability or admin key concentration before interacting with or listing a token. Prefer this over manual contract auditing when you need a programmatic, per-call verdict suitable for agent workflows or automated due diligence pipelines.

## Known failure modes

- Invalid or non-contract address returns an error
- Non-Base chain addresses are not supported
- Unverified or newly deployed contracts may yield incomplete flag data
- Network or RPC timeout results in a service error
- Missing required 'address' query parameter returns a 400-level error

## How this service works

Pay-per-call utility APIs in USDC on Base: Hebrew calendar and text tools, Shabbat times, Base token control-risk screen and address summary, plus finance arithmetic tools. General information and arithmetic only; not investment, tax or legal advice and not a recommendation to buy, sell or hold anything.

## Output

Returns a JSON object with the token's chain (e.g. 'base'), symbol (e.g. 'USDC'), an array of control-risk flags (e.g. ['upgradeable proxy']), and a verdict string (e.g. 'many_control_signals') summarizing the overall risk level.

## 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",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "Base token contract address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "flags": [
   "upgradeable proxy"
  ],
  "symbol": "USDC",
  "verdict": "many_control_signals"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-token-control-risk-screen-0a3b23c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from heb-utils-x402.hebutils-api.workers.dev](https://www.zero.xyz/host/heb-utils-x402.hebutils-api.workers.dev/llms.txt)