1Lookup

1Lookup is one API for the data checks most apps end up building piece by piece. Validate phone numbers (carrier, line type, spam risk), verify emails before you send, score IP addresses for fraud and VPN use, enrich contacts and companies, and pull social and SEO data. There are 70 products behind one key, priced per lookup, so you pay for what you use instead of stitching together five vendors. It works from any language over REST, and AI agents can call it directly through its MCP server and agent skill. Plans start at $99 a month and every plan starts with a 7-day free trial.