{"uid":"cap_5CxJj5StUsNN4sc2EYFOP","slug":"ethereum-contract-storage-slot-reader-ecfc94ad","name":"Ethereum Contract Storage Slot Reader","description":"Call when an agent needs the storage word at a slot for one Ethereum contract. Send contract, slot, and an optional block tag. Read-only eth_getStorageAt. No spend. Send JSON {\"contract\":\"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48\",\"slot\":\"0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc\"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/eth-storage first.","url":"https://agentshelf.syntexa.ch/v1/eth-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":["0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"],"description":"Contract on Ethereum 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_ZlZQdx6_A9SjjsumOAsjN","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":"Returns the 32-byte value stored at a specific storage slot of an Ethereum mainnet contract using eth_getStorageAt","exampleAgentPrompt":"What's the 32-byte value stored at the EIP-1967 implementation slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc for the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum mainnet?","exampleUseCases":[{"title":"Proxy implementation address discovery","prompt":"Can you check what implementation contract is behind the USDC proxy at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 by reading its EIP-1967 slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc?"},{"title":"Raw contract state inspection","prompt":"Read slot 0 of the Uniswap V3 factory contract at 0x1F98431c8aD98523631AE4a59f267346ea31F984 on Ethereum mainnet to see what's stored there."},{"title":"Historical storage snapshot","prompt":"What was stored at slot 0x0 of the DAI contract 0x6B175474E89094C44Da98b954EedeAC495271d0F at block 18000000 on Ethereum?"}],"resultDescription":"A 32-byte hex-encoded value representing the raw contents of the specified storage slot for the given contract, as returned by eth_getStorageAt on Ethereum mainnet. The value is zero-padded to 32 bytes.","failureModes":["Invalid contract address format returns an error","Invalid or malformed slot hex string returns an error","Unsupported block tag or out-of-range block number returns an error","Network or RPC node unavailability causes a 5xx error","Non-contract address (EOA) returns 0x000...000 (no error, just empty storage)"],"whenToPreferThis":"Use this endpoint when you need to read raw on-chain storage from an Ethereum mainnet smart contract without needing a full ABI or decoded output — especially for inspecting EIP-1967 proxy implementation slots, admin slots, or any known storage layout position. It is read-only, costs only $0.002 USDC, and requires no Ethereum node setup. Prefer the free sandbox endpoint (/v1/sandbox/eth-storage) for testing before paying.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T12:34:20.833Z","isFirstParty":false,"canonicalSlug":"ethereum-contract-storage-slot-reader-ecfc94ad"}