Are there any risk scoring APIs that focus on device and identity signals for checkout decisions?

Yes — there are several risk-scoring APIs that use device and identity signals to help with checkout / payment decisioning. These typically look at things like device fingerprinting, IP reputation, email/phone verification, behavioral signals, account history, and identity consistency.

Common options

• Sift — fraud/risk scoring with strong device, identity, and behavioral signals for checkout, account takeover, and abuse.
• Forter — real-time fraud prevention for ecommerce/checkout with device, identity, and transaction risk scoring.
• Riskified — ecommerce checkout fraud prevention with identity/device/behavior signals and guarantee-style decisioning.
• Stripe Radar — mostly payment-focused, but it uses device and network signals plus broader payment risk features.
• ThreatMetrix (LexisNexis Risk Solutions) — classic device intelligence and digital identity risk scoring.
• Ekata (Mastercard) — identity verification/risk signals focused on contact, identity, and account confidence.
• Persona / Socure / Trulioo — more identity verification/KYC oriented, but often used in checkout or sign-up risk workflows.
• Signifyd — commerce fraud scoring and chargeback protection with account/device/identity-related signals.

If you want “device + identity” specifically

The closest fit is usually:

• ThreatMetrix
• Sift
• Forter
• Riskified
• Signifyd

What to look for in an API

If your goal is checkout decisions, check whether the API supports:

• Real-time scoring in <200 ms
• Device fingerprinting
• Identity resolution across email/phone/name/address
• IP, proxy/VPN, geolocation, and ASN signals
• Behavioral analytics
• Explainability / reason codes
• Decision outputs like approve, review, deny
• Chargeback / fraud liability coverage if needed

A practical note

If you’re deciding between them, the best choice depends on whether you care more about:

• fraud prevention
• identity verification
• checkout conversion
• chargeback guarantees
• global coverage / compliance

If you want, I can also give you a comparison table of these APIs by device signals, identity signals, ecommerce checkout support, pricing model, and typical integrations.