{"uid":"cap_V1TmlVhlCxcV1mH1k6Wo9","slug":"base-storage-slot-reader-babb2150","name":"Base Storage Slot Reader","description":"Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.","url":"https://x402.agentindex.world/base/storage?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"slot":{"title":"Slot"},"address":{"type":"string","title":"Address"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-cC3ISq2gjIP7YHOObBUL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reads a raw 32-byte storage slot value from any contract on Base mainnet via eth_getStorageAt, returning the value as hex and unsigned integer.","exampleAgentPrompt":"What is the raw value stored in slot 0 of the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet?","exampleUseCases":[{"title":"Proxy implementation address lookup","prompt":"Can you read storage slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc of the contract at 0x4200000000000000000000000000000000000010 on Base? I need to find the implementation address stored there."},{"title":"DeFi contract state inspection","prompt":"I want to check the raw storage value at slot 1 for the Compound contract at 0xb125E6687d4313864e53df431d5425969c15Eb2 on Base — give me both the hex and the uint256 value."},{"title":"Detecting uninitialized storage slots","prompt":"Is slot 5 of the contract at 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 on Base set to anything, or is it zero/uninitialized?"}],"resultDescription":"Returns the 32-byte storage slot value as a zero-padded hex string and its equivalent unsigned integer representation. If the slot has never been written to, it returns a zero value (0x0000...0000 / 0).","failureModes":["Invalid contract address format returns an error","Slot index out of valid range may return zero rather than an error","Non-contract (EOA) address returns zero for all slots","Network congestion may cause slow or failed RPC responses","Missing required parameters (address or slot) returns a validation error"],"whenToPreferThis":"Use this endpoint when you need raw EVM storage inspection on Base mainnet — particularly useful for reading proxy implementation slots, inspecting packed storage variables, or auditing contract state that isn't exposed via a public getter. Prefer this over contract introspection endpoints when you know the exact storage layout and need the raw bytes rather than ABI-decoded values.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T12:46:13.425Z","isFirstParty":false,"canonicalSlug":"base-storage-slot-reader-babb2150"}