Signup Risk Score API combines email checks, domain infrastructure, provider classification, identity checks, IP reputation, explainability, bulk processing, and workflow controls into one developer-friendly signup risk API.
Instead of stitching together separate checks, Signup Risk Score API returns a deterministic 0–100 risk score, risk band, explanation, metadata, and recommended action for each signup attempt.
Get a deterministic score that summarizes how risky a signup appears based on the available checks.
Classify signups as low, moderate, high, or very high risk so your product can route users consistently.
Use `decision.action` to allow trusted users, review uncertain signups, or block very high-risk attempts.
Use one API to inspect the email, domain, provider, identity details, infrastructure context, and historical risk behind each signup.
Normalize casing, trim whitespace, validate structure, and return consistent email-quality results. A well-formed email is not automatically safe, trusted, deliverable, or non-disposable.
Detect confirmed and likely burner domains using curated datasets, operational overlays, and safe infrastructure fingerprints.
Check DNS, MX, SPF, and DMARC posture while separating non-existent domains from incomplete setup and temporary lookup failures.
Classify free providers, business domains, education domains, government domains, disposable providers, custom unverified domains, and unknown providers.
Detect shared addresses like admin@, support@, info@, sales@, and similar role-based accounts.
Flag mistyped or lookalike domains such as gmal.com before they enter signup, checkout, lead, or onboarding workflows.
Find placeholder emails, keyboard patterns, numeric-only local parts, and other low-quality identity patterns.
Compare supplied name details with the email local part without claiming to verify a person’s real identity.
Classify contextual infrastructure risk such as datacenter, VPN, proxy, and Tor usage. Raw IPs are never returned, persisted, or logged.
Risk scores are more useful when teams understand what the API found. Signup Risk Score API returns clear explanations, top reasons, risk factors, and recommendation reasons so developers and operators can understand each decision.
See the most important findings behind the decision, including the check name and contribution.
Review the specific factors that increased the score and contributed to the final recommendation.
Return a practical explanation for why the signup should be allowed, reviewed, or blocked.
Use the API in real time during signup or asynchronously for larger operational reviews.
Score users during account creation, seller onboarding, lead capture, checkout, waitlist, or community registration.
Reuse recent results to reduce repeated analysis and recognize recurring signup patterns. Cache metadata appears only on cache hits.
Upload CSV files, process signup lists asynchronously, and retrieve scored results for cleanup, review, and operational workflows.
Use Growth+ webhooks to receive trusted workflow notifications for async jobs and downstream automation.
Apply Growth+ scoring profiles for SaaS, marketplace, ecommerce, community, and fintech signup flows.
Receive usage, plan, warnings, and upgrade guidance in the response metadata.
Signup Risk Score API is designed for developers who need a practical signup-risk decision without building and maintaining a full abuse-scoring pipeline.
Receive email details, decision, checks, explanation, and metadata in one predictable response.
Use `include_checks` for detailed risk checks and `include_explanation` for human-readable decision context.
Use the same allow, review, or block model across signup, lead capture, seller onboarding, checkout, and community access.
decision.actionUse Signup Risk Score API to evaluate signups in real time, understand what the API found, and route users with an allow, review, or block recommendation.