# nbx4 Token & Proxy Report

> nbx4 Token & Proxy Report is a paid API for AI agents from nbx4.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-02).

Returns block-evidenced metadata about a Base (chain 8453) contract address, including proxy structure, ownership, token info, best-effort source match, and snapshot comparison, with a verdict label and SVG card.

## Facts

- Endpoint: GET https://nbx4.dev/v1/report?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nbx4-token-proxy-report-40db08fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bp7FjCr4860N_wqu_XLMi

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 nbx4-token-proxy-report-40db08fe
```

Example prompt: Pull the nbx4 report for report ID 'abc123' and tell me what the verdict is — who owns it, whether it's a proxy, and if the source code matches.

## When to prefer this

Use this endpoint when you need block-evidenced, structured analysis of a specific Base chain contract, particularly when you have a pre-generated report_id and need ownership, proxy, token metadata, and source match details in a single call. Prefer this over generic blockchain explorers when you need a machine-readable verdict label and SVG summary card for agent workflows or automated audits.

## Known failure modes

- Invalid or unknown report_id returns an error or empty result
- Report data may be stale if the underlying snapshot has not been refreshed recently
- Proxy slot observations may show 'unknown' if the contract does not expose standard slot patterns
- Source match is best-effort and may not resolve for non-verified or obfuscated contracts
- Chain is hardcoded to Base (chain_id 8453); reports for other chains are not supported

## How this service works

Analyze a Base Mainnet token contract: block-pinned owner(), ERC-1967 proxy slots, ERC-20 metadata, code hash, best-effort source match and prior-snapshot comparison when available. Free POST /v1/prepare returns report_id; paid GET /v1/report reads it for 0.01 USDC via x402. Not a security audit.

## Output

Returns a structured JSON object containing: a verdict_label summarizing the risk/status assessment; the contract address on Base (chain_id 8453); block-evidenced control fields (owner, admin, beacon, pending_owner, implementation) each with observed/not_observed/unknown status and supporting evidence; a code_hash observation; token metadata; best-effort source match result; an observed snapshot comparison; a report_digest for integrity; and a rendered SVG card summarizing the report visually.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "report_id"
     ],
     "properties": {
      "report_id": {
       "type": "string",
       "pattern": "^nbx4_[0-9a-f]{64}$",
       "description": "ID of a stored report returned by the free POST /v1/prepare endpoint; this example identifies an existing public sample."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "report_id",
      "chain_id",
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$"
      },
      "control": {
       "type": "object"
      },
      "chain_id": {
       "type": "integer",
       "const": 8453
      },
      "code_hash": {
       "type": "object"
      },
      "report_id": {
       "type": "string",
       "pattern": "^nbx4_[0-9a-f]{64}$"
      },
      "report_digest": {
       "type": "string"
      },
      "policy_version": {
       "type": "string"
      },
      "token_metadata": {
       "type": "object"
      },
      "snapshot_comparison": {
       "type": "object"
      },
      "source_verification": {
       "type": "object"
      }
     },
     "description": "Selected envelope fields only; the paid response includes further observations and evidence."
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "chain_id": 8453,
  "report_id": "nbx4_ad470a5aab2b590648729ab90f295ba76e0390ab2eddad01e360776a64000312"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nbx4-token-proxy-report-40db08fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nbx4.dev](https://www.zero.xyz/host/nbx4.dev/llms.txt)