LayerCall

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LayerCall scores a whole signup in one API call. Most fraud tools answer one question at a time - is this IP a VPN, is this email disposable, is this phone real. LayerCall returns IP, email, phone, domain and device together, plus the relationships between them, which is where most fake signups show up. A brand-new domain paired with a datacenter IP and a throwaway mailbox is obvious in combination and unremarkable one field at a time. Every response carries a 0-100 risk score, an allow / review / block verdict, and the individual signals behind it, so a decision can be explained rather than only made. Strictness is tunable per request without re-scoring. It also authorizes AI agents. Web Bot Auth signature verification establishes which agent is calling and whether it can prove it, and a policy engine decides what it is allowed to do - a question classical fraud signals cannot settle, because an agent arrives with a real browser, a real fingerprint and a real mailbox. Built for developers: REST, an MCP server for AI tooling, official Node and Python SDKs, and a free tier that needs no card.