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Because human approval is required by LUMEN, actual signal data is delivered asynchronously after verified payment settlement and manual review. The nextAction field guides the caller on what to do after submission.","failureModes":["Requirement string too short (under 12 chars) or too long (over 1200 chars) returns a validation error","Payment not settled on Base mainnet — request is not queued","Human approval not yet granted — results are delayed or withheld","Malformed query parameters return a 400-level error","Service unavailable on Cloudflare Workers edge returns a 5xx error","Insufficient USDC balance for $19 per-call fee blocks the request"],"whenToPreferThis":"Choose this endpoint when you need real, human-researched B2B buyer intent signals for a specific sourcing brief and are willing to pay $19 USDC per query with a human-in-the-loop approval step. This is best suited for high-value procurement research where data quality matters more than speed, and where automated or scraped buyer intent tools have proven insufficient. Not suitable for real-time or high-volume automated pipelines given the manual approval requirement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:31:17.153Z","isFirstParty":false,"canonicalSlug":"lumen-b2b-buyer-signals-research-6ee4f77b"}