Index onlineMerchant portal
Api Endpoint

Sentinel Contract Safety

Upgradeable contract and proxy admin check for any EVM contract on Base (GET ?contract=0x… or POST body {contract}). Reads EIP-1967 implementation, admin and beacon slots directly from chain state. Returns whether the contract can be upgraded, who controls the upgrade, and an upgrade risk verdict. Call when an agent needs to know if a contract owner can silently change its logic. $0.02 USDC

Open interactive test console

Offering

Provider
www.0816.cn
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://www.0816.cn/v1/base/proxy-upgrade
MIME type
application/json
First seen
2026-10-16T02:07:52.569Z
Last seen
Tags
proxy, upgrade risk, upgradeable contract, admin, eip1967, Base

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
20000 atomic units
Atomic price: 20000 · Network: eip155:196 · Asset: 0xb6ceceab302e2e4948951ee7843fc24e92933061 · Scheme: exact
Payment option 2
0.02 USDC
Atomic price: 20000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:196",
    "asset": "0xb6ceceab302e2e4948951ee7843fc24e92933061",
    "amount": "20000",
    "payTo": "0x567047dbd96a12f17e96d4427714a66811be2e11"
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "payTo": "0x567047dbd96a12f17e96d4427714a66811be2e11"
  }
]

Observed health

Status
Healthy
Latest latency
1509 ms
Average latency
1790 ms
HTTP status
402
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "contract": {
          "type": "string",
          "description": "address (0x...) — also accepted in POST body"
        }
      },
      "required": [
        "contract"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object"
    }
  },
  "required": [
    "type"
  ]
}