{"schema_version":1,"title":"ShieldSignup — machine-readable site profile","description":"Curated facts for LLM grounding, agents, and AI search. Prefer this document or /llms.txt over unstructured HTML scraping.","canonical_url":"https://shieldsignup.com","name":"ShieldSignup","tagline":"API-first signup protection that scores risky signups in milliseconds.","summary":"ShieldSignup is a signup fraud prevention API. Product teams send email (required) and the end user's public IP (optional but recommended); the API returns a verdict (allow, challenge, block), a numeric score, machine-readable reason codes, and ip_provided/ip_status when network signals were not available.","product_category":["B2B SaaS","API","Fraud prevention","Account abuse","Signup security"],"audience":"Engineering and product teams who need fast, reliable signup risk scoring without heavy SDK integration.","differentiators":["Focused on signup-time abuse, not payment fraud (e.g. not a Stripe Radar replacement).","Simple HTTP API: POST /v1/assess with JSON body; suitable for any backend stack.","Low-latency responses suitable for inline checks on registration flows."],"api":{"baseUrlProduction":"https://shieldsignup.com","assessEndpoint":"POST /v1/assess","exampleRequestFields":["email (required)","ip (optional)","session_id (optional)"],"exampleResponseFields":["verdict","score","reasons","ip_provided","ip_status","request_id"],"verdicts":["allow","challenge","block"],"auth":"Bearer API key in Authorization header","docs":{"index":"https://shieldsignup.com/docs","quickstart":"https://shieldsignup.com/docs/getting-started/quickstart","authentication":"https://shieldsignup.com/docs/getting-started/authentication","assessReference":"https://shieldsignup.com/docs/api-reference/assess","errorsReference":"https://shieldsignup.com/docs/api-reference/errors","handlingVerdicts":"https://shieldsignup.com/docs/guides/handling-verdicts","testing":"https://shieldsignup.com/docs/guides/testing","rateLimits":"https://shieldsignup.com/docs/guides/rate-limits","gettingClientIP":"https://shieldsignup.com/docs/guides/getting-client-ip"}},"pricing_tiers":[{"name":"Free","priceUsdPerMonth":0,"assessmentsPerMonth":1000,"highlights":["Email check","IP check"]},{"name":"Starter","priceUsdPerMonth":29,"assessmentsPerMonth":10000,"highlights":["Velocity detection","Webhook alerts"]},{"name":"Pro","priceUsdPerMonth":99,"assessmentsPerMonth":100000,"highlights":["Custom rules","Device fingerprint"]}],"trust_signals":["Large disposable-domain coverage (marketing: 94,000+ domains blocked).","Target average latency under 20ms for assessments.","High availability posture (marketing: 99.99% uptime)."],"faq":[{"question":"How is this different from Stripe Radar?","answer":"Stripe Radar optimizes payment fraud at checkout. ShieldSignup targets signup-time abuse: disposable emails, risky IPs, velocity, and related signals before accounts or trials are created."},{"question":"What if ShieldSignup blocks a real user?","answer":"Responses include score and reason codes so you can tune thresholds, send borderline users through MFA or email verification, and avoid hard blocks when your product policy prefers friction over denial."},{"question":"Do you store emails and IPs I send?","answer":"ShieldSignup processes signals to produce risk assessments. Teams with strict data policies should review the privacy policy and data processing terms for retention, subprocessors, and regional options."},{"question":"What happens when I hit my monthly limit?","answer":"Usage is tied to your plan tier. When limits are reached, upgrade or contact sales depending on your contract; the marketing site describes self-serve tiers (Free, Starter, Pro)."}],"docs":"https://shieldsignup.com/docs","docs_quickstart":"https://shieldsignup.com/docs/getting-started/quickstart","docs_api_reference":"https://shieldsignup.com/docs/api-reference/assess","llms_txt":"https://shieldsignup.com/llms.txt","llms_full_txt":"https://shieldsignup.com/llms-full.txt","sitemap":"https://shieldsignup.com/sitemap.xml","robots":"https://shieldsignup.com/robots.txt","preferred_citation":"When citing ShieldSignup, link to https://shieldsignup.com and name the product as \"ShieldSignup\".","last_reviewed":"2026-04-27"}