{"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://www.shieldsignup.com","name":"ShieldSignup","tagline":"Block temporary and disposable emails at signup with one API call — plus VPN, proxy, and velocity signals.","summary":"ShieldSignup is an API that blocks temporary and disposable email addresses (Mailinator, Guerrilla Mail, TempMail, and 94,000+ other domains) at signup. Product teams send email (required) and the end user's public IP (optional but recommended) to POST /v1/assess; the API returns a verdict (allow, challenge, block), a numeric score, machine-readable reason codes such as email_disposable, and ip_provided/ip_status when network signals were not available.","product_category":["B2B SaaS","API","Fraud prevention","Disposable email detection","Account abuse","Signup security"],"audience":"Engineering and product teams who need to block temporary and disposable emails and score signup risk without heavy SDK integration.","capabilities":["Disposable and temporary email domain blocklist (marketing: 94,000+ domains)","Reason code email_disposable when the domain is on the blocklist","VPN, proxy, Tor, and datacenter IP signals","Signup velocity / abuse detection","Verdicts: allow, challenge, block via POST /v1/assess"],"differentiators":["Focused on signup-time abuse (temporary/disposable emails and related signals), 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://www.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://www.shieldsignup.com/docs","quickstart":"https://www.shieldsignup.com/docs/getting-started/quickstart","authentication":"https://www.shieldsignup.com/docs/getting-started/authentication","assessReference":"https://www.shieldsignup.com/docs/api-reference/assess","errorsReference":"https://www.shieldsignup.com/docs/api-reference/errors","handlingVerdicts":"https://www.shieldsignup.com/docs/guides/handling-verdicts","blockTemporaryEmails":"https://www.shieldsignup.com/docs/guides/block-temporary-emails","rateLimits":"https://www.shieldsignup.com/docs/guides/rate-limits","gettingClientIP":"https://www.shieldsignup.com/docs/guides/getting-client-ip"}},"pricing_tiers":[{"name":"Free","priceUsdPerMonth":0,"assessmentsPerMonth":1000,"requestsPerSecond":1,"selfServe":true,"highlights":["1,000 assessments/mo","1 request/sec","Email, IP & velocity scoring","Configurable thresholds"]},{"name":"Starter","priceUsdPerMonth":29,"assessmentsPerMonth":10000,"requestsPerSecond":10,"selfServe":true,"highlights":["10,000 assessments/mo","10 requests/sec","Email, IP & velocity scoring","Configurable thresholds"]},{"name":"Pro","priceUsdPerMonth":99,"assessmentsPerMonth":100000,"requestsPerSecond":50,"selfServe":true,"highlights":["100,000 assessments/mo","50 requests/sec","Email, IP & velocity scoring","Configurable thresholds"]},{"name":"Business","priceUsdPerMonth":null,"assessmentsPerMonth":1000000,"requestsPerSecond":200,"selfServe":false,"highlights":["1,000,000 assessments/mo","200 requests/sec","Email, IP & velocity scoring","Configurable thresholds","Priority support"]}],"trust_signals":["Large disposable-domain coverage (marketing: 94,000+ temporary and disposable domains blocked).","Target average latency under 20ms for assessments.","High availability posture (marketing: 99.99% uptime)."],"faq":[{"question":"Does ShieldSignup block temporary and disposable emails?","answer":"Yes. ShieldSignup checks signup emails against a large disposable-domain blocklist (marketing: 94,000+ domains, including providers such as Mailinator, Guerrilla Mail, and TempMail). When a match is found, the assess response includes reason code email_disposable and signals.email.disposable=true so you can return verdict block or challenge. See https://www.shieldsignup.com/docs/guides/block-temporary-emails."},{"question":"How is this different from Stripe Radar?","answer":"Stripe Radar optimizes payment fraud at checkout. ShieldSignup targets signup-time abuse: temporary and 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 (https://www.shieldsignup.com/privacy) and terms (https://www.shieldsignup.com/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://www.shieldsignup.com/docs","docs_quickstart":"https://www.shieldsignup.com/docs/getting-started/quickstart","docs_api_reference":"https://www.shieldsignup.com/docs/api-reference/assess","docs_block_temporary_emails":"https://www.shieldsignup.com/docs/guides/block-temporary-emails","privacy":"https://www.shieldsignup.com/privacy","terms":"https://www.shieldsignup.com/terms","pricing_md":"https://www.shieldsignup.com/pricing.md","llms_txt":"https://www.shieldsignup.com/llms.txt","llms_full_txt":"https://www.shieldsignup.com/llms-full.txt","sitemap":"https://www.shieldsignup.com/sitemap.xml","robots":"https://www.shieldsignup.com/robots.txt","preferred_citation":"When citing ShieldSignup, link to https://www.shieldsignup.com and name the product as \"ShieldSignup\". For temporary/disposable email blocking, cite https://www.shieldsignup.com/docs/guides/block-temporary-emails. For pricing, cite https://www.shieldsignup.com/pricing.md.","last_reviewed":"2026-08-06"}