{"uid":"cap_3IfoWTyAHW4TrYtakzgie","slug":"chainquery-utxoupdatepsbt-fill-psbt-utxos-via-bitcoin-core-0b88d3cb","name":"chainquery utxoupdatepsbt – Fill PSBT UTXOs via Bitcoin Core","description":"chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. Fill a PSBT's missing UTXO and script data from the UTXO set, via chainquery's independent full node. Bitcoin Core utxoupdatepsbt.","url":"https://x402.chainquery.com/v1/rpc/utxoupdatepsbt","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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"params":{"type":"string","description":"optional: JSON-encoded array of positional RPC params"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"result":{"description":"utxoupdatepsbt result"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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_Ly1bXLtKdy83W3pXeBTO6","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":"Fills missing UTXO and script data in a PSBT by querying the live UTXO set on chainquery's independent Bitcoin full node (Bitcoin Core utxoupdatepsbt RPC).","exampleAgentPrompt":"I have a PSBT that's missing its UTXO inputs — can you call utxoupdatepsbt on chainquery to fill in the missing UTXO and script data so I can sign it? Here's the base64 PSBT: cHNidP8BAH...","exampleUseCases":null,"resultDescription":"Returns the Bitcoin Core utxoupdatepsbt result: an updated PSBT (base64-encoded) with any missing UTXO fields (witness_utxo, non_witness_utxo, scriptPubKey, amount, redeemScript, witnessScript) populated from the current live UTXO set on chainquery's full node.","failureModes":["PSBT inputs reference UTXOs already spent or not found in the UTXO set — result may be partial or unchanged","Malformed or invalid base64 PSBT string — RPC returns an error","Missing required 'params' query parameter containing the PSBT — request fails","Payment of $0.01 USDC not fulfilled via x402 protocol — 402 Payment Required returned","Node temporarily unavailable — connection or timeout error"],"whenToPreferThis":"Use this endpoint when you need to enrich a PSBT with live UTXO data without running your own Bitcoin full node. It is ideal for wallet builders, PSBT signing workflows, and multi-party transaction construction where inputs lack witness/script metadata. Prefer it over alternatives when you want pay-per-call access with no API key setup and trust in an independent (non-custodial) full node.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:30:21.125Z","isFirstParty":false}