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Base Contract Raw Storage Slot Reader (eth_getStorageAt)
x402
Base Contract Raw Storage Slot Reader (eth_getStorageAt) is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Returns the raw 32-byte storage slot value for any Base contract address using eth_getStorageAt, ideal for reading proxy implementation/admin slots or arbitrary contract state.
Price / call$0.002
Success—
StatusUnknown
How this service works
Raw storage slot (eth_getStorageAt) of a Base contract. Use when an agent needs proxy implementation/admin slots or raw contract state.
Output
Returns a JSON object with four fields: address (the queried contract), slot (the hex slot index), value (the 32-byte hex-encoded storage value), and chain (always 'base'). The value can be decoded as an address, uint256, bool, or bytes32 depending on the contract's storage layout.
Example use cases
Proxy implementation slot verification
“I need to verify the current implementation address of the upgradeable proxy at 0x833589fCd6eDb6E08f4c7C32D4f71b54bdA02913 on Base — can you read the EIP-1967 implementation slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc for me?”
Admin slot check before DeFi interaction
“Before my agent interacts with this Base contract at 0x4200000000000000000000000000000000000010, can you check the proxy admin slot 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103 to confirm who controls upgrades?”
Raw contract state read for slot 0
“Fetch the raw value at storage slot 0x0 for the Base contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 — I want to see what the first storage variable is set to.”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/storage-at?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs low-level on-chain storage inspection for Base contracts — particularly for reading EIP-1967 proxy implementation/admin slots, verifying upgrade state, or accessing raw storage values that are not exposed through ABI-decoded read functions. Prefer this over higher-level contract-call endpoints when you need to bypass ABI decoding or when the slot layout is known but no public getter exists. At $0.002 per call it is cost-effective for single-slot spot checks.
Side effects
- Invalid or non-0x-prefixed contract address returns an error response
- Non-existent contract or EOA address returns a zero value (0x000...0000) without indicating absence of contract
- Invalid slot hex format may cause a bad request error
- Network or RPC connectivity issues on Base may result in a 5xx response
- Payment failure via x402 protocol (insufficient USDC) blocks the request before it reaches the RPC
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"slot": "0x0",
"chain": "base",
"value": "0x0000000000000000000000000000000000000000000000000000000000000001",
"address": "0x833589fCd6eDb6E08f4c7C32D4f71b54bdA02913"
}
}Tags
x402
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