Send an E.164 number and get caller-name context where available, line type, carrier, and an optional low-confidence supplementary risk signal — for softphones, PBXs, SBCs, AI voice agents, chatbots, and CRMs. Copy-paste artifacts, a rate-limited free tier, and fail-open behaviour on live call paths. Your system keeps every routing, labeling, dialing, and blocking decision.
Self-service, instant, no card and no sales call. Every endpoint works on the free tier (rate-limited). The key is shown exactly once and stored only as a hash, so save it.
Free / unverified accounts share a pooled allowance — 10 lookups/min, 50 lookups/day, and 10 reports/day, pooled across your account’s keys; other endpoints have documented per-key fair-use windows. Verify a business number to raise the pooled limit (+2,000 lookups/day each), or add prepaid credit ($5–$500) to burst past it on the metered standard tier. See pricing for the full picture.
Numbers Online returns an advisory caller name and a low-confidence, supplementary spam-risk signal. It never asserts that a call is lawful, unlawful, “safe”, or otherwise, and a missing name means “unknown”, never a negative signal. On any live-call path the integration is built to fail open: a slow or failing lookup advances the call unchanged, never delays or drops it. Your system keeps every routing, labeling, dialing, and blocking decision and remains responsible for compliance. Point your coding agent at the machine-readable llms.txt and the authoritative OpenAPI spec for the full contract.