{"uid":"cap_9KyvND-0QpU40iwPUND0G","slug":"agentshelf-base-storage-slot-reader-2e4f1813","name":"Agentshelf Base Storage Slot Reader","description":"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.","url":"https://agentshelf.syntexa.ch/v1/base-storage?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"slot":{"type":"string","examples":["0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc"],"description":"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":{"type":"string","description":"Optional block number or tag latest, finalized, or safe. Example: latest. Omit it for latest. A JSON number such as 100 is accepted."},"contract":{"type":"string","examples":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"],"description":"Contract on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. eth_getStorageAt is read-only."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Oxb7vmljU6iYy3aQ9-Zlf","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reads a single 32-byte storage slot value from a contract on Base mainnet using eth_getStorageAt","exampleAgentPrompt":"What value is stored at slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc for the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet?","exampleUseCases":[{"title":"Inspect upgradeable proxy implementation","prompt":"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?"},{"title":"Read contract storage at finalized block","prompt":"Fetch the raw value at storage slot 0x0 for contract 0x4200000000000000000000000000000000000006 on Base mainnet at the finalized block."},{"title":"Audit historical contract state","prompt":"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?"}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T12:34:04.669Z","isFirstParty":false,"canonicalSlug":"agentshelf-base-storage-slot-reader-2e4f1813"}