EVM Contract Storage Slot Reader

x402

EVM Contract Storage Slot Reader is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-13).

Reads a raw storage slot of a smart contract (by decimal, hex, or EIP-1967 standard slots) on 12 EVM chains, returning the value as hex, integer, and address.

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

Read a raw storage slot of a contract (decimal, hex or the standard EIP-1967 implementation/admin/beacon slots), as integer and as address, at any block. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.

Output

Returns a JSON object with the chain name, contract address, slot identifier, a boolean indicating if the slot is empty, the raw 32-byte hex value, the value as a decimal integer string, and the value interpreted as an Ethereum address (last 20 bytes).

Example use cases

Proxy implementation address lookup

“Tell me what the current implementation contract is for the proxy at 0x4200000000000000000000000000000000000010 on Optimism — check the EIP-1967 implementation slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc.”

Historical storage slot at specific block

“Read storage slot 0x0 of contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum at block 19000000 — give me the hex value, integer, and what it looks like as an address.”

EIP-1967 admin slot inspection on Arbitrum

“Check who the admin is for the upgradeable proxy at 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8 on Arbitrum by reading the EIP-1967 admin slot 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103.”

Technical details

Endpoint

POSThttps://api.vextorium.com/evm-storage-pago?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to inspect raw EVM contract storage — especially for proxy contract patterns (EIP-1967, transparent proxy, beacon proxy) to find implementation or admin addresses, or when you need to read arbitrary storage slots across 12 major EVM chains including Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic, and Unichain. Prefer this over generic RPC calls when you need the value returned as hex, integer, and address simultaneously with no RPC setup required.

Side effects

Invalid contract address format returns an error
Unsupported chain identifier returns validation error
Non-existent block number may return error or revert
Malformed slot identifier (not valid hex or decimal) causes rejection
Network RPC unavailability for a specific chain may cause timeout
Empty slot returns vacio:true with zero-value hex

Input

Schema · Request body

Field	Type	Description
red	string	Chain (default base)
slot	string
bloque	string
contrato	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "red": "base",
    "slot": "0x0",
    "vacio": false,
    "contrato": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "valor_hex": "0x0000000000000000000000003abd6f64a422225e61e435bae41db12096106df7",
    "valor_entero": "335346009260450724142082839821853564916387048951",
    "como_direccion": "0x3ABd6f64A422225E61E435baE41db12096106df7"
  }
}

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