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Signup Risk API evaluates an email address — with optional signup context such as a submitted name, client IP, or industry — and returns a deterministic, explainable decision you can act on at registration time.

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What Signup Risk API does

Send an email address to the analysis endpoint and receive:
  • a 0–100 risk score
  • a risk band: low, moderate, high, or very_high
  • a recommended action: allow, review, or block
  • individual risk checks with evidence and per-check contributions, when requested
  • a plain-language explanation of the decision, when requested
  • decision context: warnings, usage and quota snapshot, and plan information
Every response answers one question with evidence you can inspect, log, and audit.

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The core product question

Should this registration receive access?
Signup Risk API turns that question into a concrete recommendation — allow it, send it to review, or block it — backed by a deterministic score and check-level evidence rather than an opaque verdict.

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Common use cases

  • SaaS and free-trial protection — decide which signups get access before they consume resources
  • Seller onboarding — route new sellers into review queues based on risk
  • Community registration — slow down or stop bulk and throwaway account creation
  • Account-linked promotion protection — filter signups created to claim bonuses
  • Inbound form routing — sort leads by risk before they reach your CRM
  • Bulk operational reviews — score existing lists asynchronously with bulk jobs

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What it is not

Signup Risk API is a signup-decision API, not a general identity or messaging tool. It is not:
  • SMTP mailbox verification — it does not send mail or confirm an inbox exists
  • KYC or identity verification — it does not verify government identities or documents
  • device fingerprinting — it scores the email and submitted context, not the device
  • payment transaction scoring — it does not evaluate transactions or chargebacks
  • content moderation — it does not analyze message or post content

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Next steps

Make your first request

Get an API key and send your first analysis request in a few minutes.

Get an API key

Create an account at app.signuprisk.com and issue a first-party API key.