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Base Storage Slot Read
Base Storage Slot Read is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-24).
Reads a raw 32-byte storage slot of any contract on the Base blockchain using eth_getStorageAt, returning the value as a hex string, number, and address.
Price / call$0.01
Success—
StatusUnknown
How this service works
Read one raw storage slot of a contract on Base (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use base_proxy. A malformed address or slot is rejected with 400, uncharged.
Output
Returns a JSON object containing: the queried slot key, the raw 32-byte hex value, the value interpreted as a large integer (asNumber), the value interpreted as an EVM address if applicable (asAddress), the block number at which the read was taken, the chain name ('base'), and the chainId (8453).
Example use cases
Inspect proxy implementation pointer
“Read the EIP-1967 implementation slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc from the Base proxy contract at 0xdC6fF44d5d932Cbd77B52E5612Ba0529DC6226F1 — what address is stored there?”
Find contract owner without getter
“The Base contract at 0x3154Cf16ccdb4C6d922629664174b904d80F2C35 doesn't expose an owner() function — can you check slot 0 to see what address owns it?”
Debug mapping slot value
“I need to inspect the raw storage at the 0x hashed mapping key 0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab on the Base contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — what value is stored there?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/base/storage?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to read internal contract state on Base that has no public getter function — such as owner variables, proxy implementation pointers, or mapping entries accessed by their keccak256 slot key. Prefer the dedicated base_proxy endpoint for standard EIP-1967 proxy lookups. Choose this over Ethereum mainnet or Polygon equivalents when the contract is specifically deployed on Base (chainId 8453).
Side effects
- 400 error (uncharged) if the contract address is malformed or not a valid 0x address
- 400 error (uncharged) if the slot key is not a valid decimal index or 0x 32-byte hex string
- Empty or zero value returned if the slot is uninitialized
- No error if the address is valid but holds no contract — returns zero slot value
- Network or RPC timeout returning a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slot | string | Slot: a decimal index (0, 1, 2…) or a 0x 32-byte key |
| addressrequired | string | 0x contract address |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| slot | string | |
| block | number | |
| chain | string | |
| value | string | |
| address | string | |
| chainId | number | |
| asNumber | string | |
| asAddress | string |
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