Start here
One screen to a first call.
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API quickstart
A key, one POST, and the response annotated. The three steps to a first inspection, with the one field to branch on.
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Get an API key
Self-serve signup. 50 free API documents a month, no card.
Core concepts
What a signal is, and what the report commits to.
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Fraud signals field guide
The signal families the engine runs, what each detects, its benign causes, and how severity is decided.
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The report, annotated
Every field of the response explained on a worked example: score, band, signals and the evidence under them.
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Your verdict policy
Send your thresholds with the request and the response says accept, review or reject, by your rule.
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Issuer baselines
Structural profiles of issuers you trust, trained from documents you hold. Only fingerprints are stored.
Reference
The full contract, in the form you prefer.
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API reference
The written reference: auth, both request forms, /compare and /metadata, the error table, limits and posture.
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OpenAPI explorer
The spec, browsable in Swagger UI. It opens outside the site chrome and is English only.
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openapi.json
The raw OpenAPI 3.0 document, for SDK generators and anyone who wants the spec as a file.
Guides and operations
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All guides
The field guide and the walkthroughs, one question each.
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Engine changelog
What changed in each engine release, and when.
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Status
Uptime and probe history, measured from outside the box.
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Security
What happens to a document: processed in memory, never stored, and the rest of the posture in full.