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NEUS bills metered usage (API, verification, related calls) to the profile linked to your app. Credits spend first. If a call is not covered, use x402 (x402).

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What appId does

appId identifies your app on each request. It is public (not a secret). Create the app in Platform setup. Pass the same value from the SDK or widgets.

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When credits run out

Billable calls return 402 with a quote. Complete x402. Retry with PAYMENT-SIGNATURE. Steps: x402.

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Payment gates

Optional visitor charges. Payment gates.

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Next

Link your app

x402

Payment gates

SDK