Spam check: see if a number is reported as spam or a scam

The spam check tells you how a phone number has been reported by others, and what kind of caller sits behind it. Use it to screen inbound calls, or to clean a dialing list before you call it.

What it tells you

• The caller type behind the number, for example a spam caller rather than a normal one.
• The threat category the number falls into.
• How many complaints have been filed against the number.
• The kind of nuisance or scam reported, for example telemarketing.
• A fraud score and risk level, with the reasons that drove them, such as spam reports.
• A suggested next action and a short plain-English message about the number.

What you need to provide

The phone number you want to screen for spam and robocall reports.

What it costs

1 credit per lookup. Numbers outside the US and Canada are metered separately and can cost more per lookup. Live per-product costs are shown on the Billing page in your dashboard.

How to run it

• In the dashboard: Spam & Risk Check
• From your code: POST /v1/phone-spam, then see the Developer Hub at app.1lookup.io/developer-hub.

Good to know

• Results are point-in-time. Complaint counts build up over time and a number that looks clean now can be reported tomorrow, so re-check numbers you keep calling.
• A low report count is not proof that a caller is safe, and a high one is not proof of fraud. Use the score alongside your own rules.
• The result describes reports made against the number, not the identity of the person using it.

Updated on: 24/08/2026