{"uid":"cap_upXSgefyjfY6S9Kb5gmk2","slug":"ncbi-pubchem-compound-search-via-e-utilities-08a8a2a1","name":"NCBI PubChem Compound Search via E-utilities","description":"Search the NCBI PubChem Compound chemical database and return matching UIDs for query {q} via E-utilities. Query: ?q= Returns JSON.","url":"https://clonecho.builda.company/x402/s/ncbi-esearch-pccompound","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2oHPQK8sdcceqzMlnUWF1","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Searches the NCBI PubChem Compound chemical database using E-utilities and returns matching compound UIDs for a given query string.","exampleAgentPrompt":"Can you search PubChem for compounds matching 'ibuprofen' and give me the compound UIDs?","exampleUseCases":null,"resultDescription":"A JSON response containing matching PubChem Compound UIDs (CIDs) for the query, along with result count metadata as returned by the NCBI E-utilities esearch endpoint targeting the pccompound database.","failureModes":["Empty result set if no compounds match the query string","Invalid or malformed query string may return zero results or an error","NCBI E-utilities rate limiting or downtime causing failed requests","Payment failure (insufficient USDC balance) returning 402 error","Query too vague returning an unexpectedly large number of UIDs"],"whenToPreferThis":"Use this endpoint when you need to resolve chemical names, CAS numbers, molecular formulas, or other identifiers to PubChem Compound UIDs (CIDs), especially when integrating with downstream NCBI/PubChem API calls that require CIDs. Prefer this over manual PubChem web lookups or direct NCBI E-utilities calls when you want a simple pay-per-call REST interface without managing API keys.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:52:45.270Z","isFirstParty":false}