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Vextorium EVM Storage Slot Reader
x402
Vextorium EVM 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 2026-10-30).
Reads the raw storage value at a specific slot of any EVM smart contract, returning the hex value, decoded address, and integer representation.
Price / call$0.003
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
Returns the queried storage slot value in three representations: hex_value (raw 32-byte hex string), as_address (checksum-cased Ethereum address if the value is an address), and integer_value (full integer representation), along with the network, contract address, slot index, and an empty flag indicating whether the slot is unset.
Example use cases
Proxy implementation address lookup
“What's the implementation contract address stored in the EIP-1967 implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076c3ead16360527975278fcf) of the proxy contract at 0x1234abcd... on Ethereum?”
DeFi protocol admin verification
“Check who the admin is for the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum by reading storage slot 0x0 — give me the hex and decoded address.”
Smart contract state inspection on Arbitrum
“Read storage slot 0x1 of the contract 0xFF970A61A04b1cA14834A43f5dE4533ebDDB5CC8 on Arbitrum and show me the raw hex value and the integer it represents.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/evm-storage?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to inspect the raw on-chain storage of any EVM smart contract at a specific slot — ideal for discovering proxy implementation addresses, reading internal state variables not exposed via ABI, verifying contract storage layouts, or auditing DeFi protocols. It covers 12 major EVM chains and returns the value in multiple decoded formats (hex, address, integer) in a single call, making it far more convenient than running your own RPC node or calling eth_getStorageAt manually.
Side effects
- Invalid contract address format — returns error if contract is not a valid hex address
- Unsupported network — only base, ethereum, arbitrum, optimism, polygon, bnb, avalanche, gnosis, line, scroll, sonic, unichain are accepted
- Invalid slot format — slot must be a valid hex string
- Block number not found — if specified block does not exist on chain
- Payment failure — insufficient USDC balance or x402 payment not accepted
- Network congestion — RPC timeout when chain is under heavy load
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slot | string | |
| block | string | |
| network | string | Chain (default base) |
| contract | string |
Output
Schema · Response
{
"type": "json",
"example": {
"slot": "0x0",
"empty": false,
"network": "base",
"contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"hex_value": "0x0000000000000000000000003abd6f64a422225e61e435bae41db12096106df7",
"as_address": "0x3ABd6f64A422225E61E435baE41db12096106df7",
"integer_value": "335346009260450724142082839821853564916387048951"
}
}Tags
x402
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