API & payload

A real-shaped Device ID payload

Verify a session and get back a stable Arkose ID, a confidence score, spoofing and network signals, and device details. Here's exactly what the response looks like.

Where it fits

One call, anywhere risk matters

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Arkose Device IDpersistent ID + risk context

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Allow trusted device

Step up if risky

Block / deny

POST https://verify-api.arkoselabs.com/api/v4/verify/

Recommended action:

Response shape matches the Arkose Verify API device_id object. Values are illustrative. See full field reference →

Reading the response

The fields that drive your decisions

arkose_id

The persistent device identifier. Stays stable across sessions even when cookies are cleared, so you can recognize returning devices and link accounts.

confidence_score

How certain the match is, 0–100. Set your own threshold to trade off precision against recall.

device_first_seen / device_last_seen

Device age and recency. A brand-new device acting like a veteran is a classic fraud signal.

device_spoofing_detected

Flags devices tampering with their fingerprint, the tell behind payment fraud and fake-account rings.

stateless_device_id / stateful_device_id

Stateless matching works same-day with your API key; stronger stateful matching switches on once your vanity URL is provisioned.

is_vpn / is_proxy / is_tor

Network-evasion signals from IP intelligence, surfaced alongside the device signal.

device_id.risk_score / risk_band

A 0–100 risk score and Low / Medium / High band scoped to the device itself — not just the session. Map it directly to allow, monitor, or block decisions.

device_id.risk_insights

The exact signals we spotted on this device — Headless_Browser_Confirmed, Virtual_GPU_Confirmed, Hardware_Signals_Suppressed, Timezone_Mismatch_Detected, and more. Tells you precisely why a device is flagged, not just that it is.

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