{"uid":"cap_l0xKDuDXPD_POvORKW6FV","slug":"saylor-innovations-evm-contract-storage-slot-reader-08cd7e94","name":"Saylor Innovations EVM Contract Storage Slot Reader","description":"Read one 32-byte contract storage slot on 16 EVM chains, returned as hex, integer and address form, for example proxy implementation slots.","url":"https://saylorinnovations.com/api/chain/storage?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["chain","address","slot"],"properties":{"slot":{"type":"string","description":"storage slot as a decimal integer or 0x hex (for example 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc, the EIP-1967 implementation slot)"},"chain":{"type":"string","description":"chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id"},"address":{"type":"string","description":"the contract address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["chain","chain_id","address","slot","value_hex","value_uint","is_zero","source"],"properties":{"slot":{"type":"string","description":"the storage slot, normalized to hex"},"chain":{"type":"string","description":"the chain name that was queried"},"source":{"type":"string","description":"where the data was read from"},"address":{"type":"string","description":"the contract that was read"},"is_zero":{"type":"boolean","description":"true when the slot is empty"},"chain_id":{"type":"number","description":"EIP-155 chain id of that network"},"value_hex":{"type":"string","description":"the raw 32-byte value"},"as_address":{"type":["string","null"],"description":"the low 20 bytes as an address when the value looks like one, else null"},"value_uint":{"type":"string","description":"the value as an unsigned integer string"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_UpJgraqPGtIvNzsAKY6yL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","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 from a smart contract on any of 16 supported EVM chains, returning the value as hex, unsigned integer, and address form.","exampleAgentPrompt":"What address is stored in the EIP-1967 implementation slot (0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc) of the contract 0x1234567890abcdef1234567890abcdef12345678 on Ethereum?","exampleUseCases":[{"title":"Detect proxy implementation on Base","prompt":"Can you read the EIP-1967 implementation slot — 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc — of contract 0xd9Db270c1B5E3Bd161E8c8503c55cEABeE709552 on Base and tell me what implementation address is stored there?"},{"title":"Inspect raw storage slot on Arbitrum","prompt":"Read storage slot 0 from the contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Arbitrum — show me the hex value, integer value, and whether it decodes to an address."},{"title":"Verify Gnosis Safe owner slot","prompt":"Check what's stored at storage slot 3 of 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7 on the Gnosis chain — I want the raw hex, the uint, and if it looks like an address."}],"resultDescription":"A JSON object containing the chain name, EIP-155 chain ID, contract address queried, normalized slot in hex, the 32-byte raw value as hex, the value as an unsigned integer string, the low 20 bytes decoded as an Ethereum address (or null if not address-like), a boolean is_zero indicating whether the slot is empty, and a source field identifying where the data was read from.","failureModes":["Invalid or unsupported chain name/ID returns an error","Malformed contract address (non-checksummed or wrong length) may cause a rejection","Invalid slot format (neither decimal integer nor valid 0x hex) causes a parse error","Contract does not exist on specified chain — slot will typically return zero value with is_zero=true","Network or RPC timeout on the target chain returns a server error","Payment not included or insufficient — returns HTTP 402"],"whenToPreferThis":"Choose this endpoint when you need to read a specific, known storage slot from a smart contract on one of 16 supported EVM chains — especially for proxy pattern inspection (EIP-1967, EIP-897), verifying delegated addresses, or inspecting raw contract state without deploying or running a full node. It is ideal for agents auditing contract upgradability, detecting proxy implementations, or verifying on-chain configuration values across Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche, Gnosis, Linea, Scroll, Mantle, Blast, Sonic, Celo, Berachain, and Unichain.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T12:33:10.794Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-evm-contract-storage-slot-reader-08cd7e94"}