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Agentshelf Base Storage Slot Reader
x402
Agentshelf Base Storage Slot Reader is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Reads a single 32-byte storage slot value from a contract on Base mainnet using eth_getStorageAt
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs the storage word at a slot for one Base contract. Send contract, slot, and an optional block tag. Read-only eth_getStorageAt. No spend. Send JSON {"contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","slot":"0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/base-storage first.
Output
Returns a 32-byte hex-encoded storage word representing the raw value stored at the specified slot in the given contract's storage on Base mainnet, optionally at a specified block number or tag (latest, finalized, safe).
Example use cases
Inspect upgradeable proxy implementation
“Can you look up the EIP-1967 implementation slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc for the proxy contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet so I can see which implementation it's pointing to?”
Read contract storage at finalized block
“Fetch the raw value at storage slot 0x0 for contract 0x4200000000000000000000000000000000000006 on Base mainnet at the finalized block.”
Audit historical contract state
“I need to check what was stored at slot 5 in the contract 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 on Base at block 12000000 — can you pull that for me?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/base-storage?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to read a specific raw storage slot from a Base mainnet contract without executing a transaction. Ideal for inspecting proxy implementation addresses (EIP-1967), reading packed storage variables, auditing historical state at specific blocks, or any scenario where you know the slot index and need the 32-byte value directly. Prefer this over general-purpose Ethereum JSON-RPC services when you want a simple HTTP POST with x402 micropayment, no API key, and no node setup.
Side effects
- Invalid contract address format returns an error
- Invalid slot format (not a valid uint256 or 0x-prefixed hex) returns a parsing error
- Invalid block tag or out-of-range block number may return an RPC error
- Contract does not exist at the address returns zero bytes (not an error, just empty storage)
- Network or RPC node timeout returns a service error
- Missing required fields (contract or slot) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slot | string | Storage slot as a uint256 decimal or 0x-prefixed hex word of at most 32 bytes. Example: 0. The response value is 32 bytes. |
| block | string | Optional block number or tag latest, finalized, or safe. Example: latest. Omit it for latest. A JSON number such as 100 is accepted. |
| contract | string | Contract on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. eth_getStorageAt is read-only. |
Tags
x402
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