POST /api/v1/paid/proxy-implementation — $0.003 per call

Use when an agent asks if a contract is an upgradeable proxy and where its code is. Returns the standard (EIP-1967, beacon, UUPS, minimal, legacy, Safe, none), implementation, admin, beacon, slots and block read on Base, Ethereum, Optimism, Arbitrum or Polygon; 4 extra slots decoded. $0.003.

Price	$0.003 per call (3000 atomic USDC, scheme exact)
Category	chain-data
Rails	x402 · USDC on Base (eip155:8453) and Solana · MPP pathUSD on Tempo
Canonical URL	https://api.oblique.markets/api/v1/paid/proxy-implementation

Try it

curl -i https://api.oblique.markets/api/v1/paid/proxy-implementation
# → HTTP 402 with the exact payment requirements; pay, then retry with PAYMENT-SIGNATURE (x402) or Authorization: Payment (MPP)

Input schema

{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "chain": {
   "type": "string",
   "enum": [
    "base",
    "ethereum",
    "optimism",
    "arbitrum",
    "polygon",
    "8453",
    "1",
    "10",
    "42161",
    "137"
   ],
   "default": "base",
   "description": "Chain name (base, ethereum, optimism, arbitrum, polygon) or chain id (8453, 1, 10, 42161, 137). Default base.",
   "examples": [
    "base"
   ]
  },
  "address": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$",
   "description": "Contract address to inspect, 0x plus 40 hex characters (any case).",
   "examples": [
    "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
   ]
  },
  "block": {
   "type": "string",
   "default": "latest",
   "description": "'latest' (default) or a decimal block number; explicit blocks are immutable and cached longer.",
   "examples": [
    "latest"
   ]
  },
  "slots": {
   "type": "array",
   "maxItems": 4,
   "items": {
    "type": "string"
   },
   "description": "Up to 4 extra raw storage slots to read and decode: each a 0x bytes32 or a decimal slot number. GET accepts a comma-separated list.",
   "examples": [
    [
     "0",
     "1"
    ]
   ]
  }
 },
 "additionalProperties": false
}

Example output

{
 "chain": "base",
 "chain_id": 8453,
 "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
 "block_number": 40203311,
 "block_tag": "latest",
 "is_contract": true,
 "is_proxy": true,
 "standard": "oz-legacy",
 "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
 "implementation_has_code": true,
 "implementation_name": "FiatTokenV2_2",
 "proxy_name": "FiatTokenProxy",
 "admin": null,
 "beacon": null,
 "slots_read": [
  {
   "label": "eip1967.implementation",
   "slot": "0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  {
   "label": "eip1967.admin",
   "slot": "0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  {
   "label": "eip1967.beacon",
   "slot": "0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  {
   "label": "eip1822.proxiable",
   "slot": "0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  {
   "label": "oz-legacy.implementation",
   "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
   "raw": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779"
  },
  {
   "label": "slot0",
   "slot": "0x0000000000000000000000000000000000000000000000000000000000000000",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000"
  }
 ],
 "extra_slots": [
  {
   "slot": "0x0000000000000000000000000000000000000000000000000000000000000000",
   "raw": "0x0000000000000000000000000000000000000000000000000000000000000000",
   "as_uint256": "0",
   "as_address": null,
   "as_bool": false
  }
 ],
 "rpc": {
  "endpoint_class": "public",
  "hosts": [
   "mainnet.base.org"
  ],
  "calls": 9
 },
 "source": "public-rpc+explorer",
 "read_at": "2026-09-12T01:30:00.000Z",
 "freshness": {
  "served_at": "2026-09-12T01:30:00.120Z",
  "cache": "miss",
  "cache_age_seconds": 0,
  "ttl_seconds": 30
 },
 "receipt": {
  "sku": "proxy-implementation",
  "payer": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "payment_network": "eip155:8453"
 }
}

Clients

Worked TypeScript/Python clients and MCP configs: oblique-markets/oblique-examples · Agent Skills: oblique-markets/skills

Pay per call with x402 (USDC on Base or Solana) or MPP (pathUSD on Tempo). No accounts. Machine doors: /.well-known/x402.json · /openapi.json · /llms-full.txt · MCP · humans: remote.observer