{"uid":"cap_v2EBD1LcUfYhBSaeR8i1k","slug":"apiosk-oracle-reading-chainlink-aggregator-on-base-ae0ce83f","name":"Apiosk Oracle Reading – Chainlink Aggregator on Base","description":"Call a Chainlink aggregator latestRoundData directly on Base and return the round with a signed JWS-HS256 receipt. Pass a known pair (ETH/USD, BTC/USD, USDC/USD, DAI/USD, LINK/USD) or an explicit aggregator address; the number is itself on-chain and re-checkable from the feed address + block in the envelope.","url":"https://gateway.apiosk.com/attestations/oracle-reading","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.033","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":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Fs2eFA7CPd7l-BB5-b4e2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reads the latest Chainlink price oracle round data on Base for a given pair or aggregator address and returns a signed JWS-HS256 receipt anchored to an on-chain block.","exampleAgentPrompt":"Can you get me the latest ETH/USD price from the Chainlink oracle on Base and give me a signed receipt I can verify on-chain?","exampleUseCases":[{"title":"DeFi collateral valuation check","prompt":"What's the current BTC/USD price from the Chainlink oracle on Base? I need a signed attestation I can attach to my collateral report."},{"title":"Stablecoin peg monitoring","prompt":"Fetch the latest USDC/USD round data from the Chainlink aggregator on Base and return a signed JWS receipt so I can confirm the peg hasn't drifted."},{"title":"Custom aggregator address query","prompt":"Read the latest round from this Chainlink aggregator address 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419 on Base and give me the price and a verifiable signed envelope."}],"resultDescription":"Returns the full latestRoundData struct (roundId, answer/price, startedAt, updatedAt, answeredInRound) along with a JWS-HS256 signed receipt containing the feed address and block number, enabling independent on-chain re-verification of the returned price.","failureModes":["Unknown pair name returns an error listing supported pairs (ETH/USD, BTC/USD, USDC/USD, DAI/USD, LINK/USD)","Invalid aggregator address returns a contract call failure or revert error","RPC connectivity issues to Base mainnet result in a timeout or upstream error","Malformed request body missing both pair and address returns a 400 validation error","Payment failure via x402 protocol results in HTTP 402 before data is returned"],"whenToPreferThis":"Choose this endpoint when you need a cryptographically attested, on-chain verifiable price from a Chainlink oracle on Base — especially when downstream consumers need to re-verify the price independently using the included feed address and block number. Prefer over raw RPC calls when you need a signed receipt for audit trails, compliance, or agent-to-agent trust. Best for DeFi apps, collateral engines, stablecoin monitors, and any workflow requiring tamper-evident price proofs rather than a plain price lookup.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:45:48.472Z","isFirstParty":false}