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Arcadia Age API (A3)
Arcadia Age API (A3) provides compliant, frictionless age assurance built for the US market — without verification walls, identity friction, or storing a single byte of PII. Keep your users flowing. Stay compliant. Currently available in the United States only; EU/EEA/UK country codes are rejected (403 Forbidden).
- Authority
- 45 reach 0 · trust 5 · quality 25 · freshness 15
- Tier
- listed
- llms.txt
- https://www.a3api.io/llms.txt
- llms-full.txt
- https://www.a3api.io/llms-full.txt
- Sections
- 7
- Links
- 18
- Size
- 8417 bytes
- Country
- — Publisher location unknown; CDN address excluded
- Country evidence
- No published address evidence collected yet
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-26T16:44:15.801Z
- Last checked
- 2026-10-27T15:44:32.578Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-26T16:44:15.816Z. Cached copy · Source on a3api.io
# Arcadia Age API (A3)
> Arcadia Age API (A3) provides compliant, frictionless age assurance built for the US market — without verification walls, identity friction, or storing a single byte of PII. Keep your users flowing. Stay compliant. Currently available in the United States only; EU/EEA/UK country codes are rejected (403 Forbidden).
> For comprehensive documentation including full API reference, request/response schemas, evidence tags, and code examples, see [llms-full.txt](https://www.a3api.io/llms-full.txt).
A3 (Arcadia Age API) is the unified age compliance layer for web, iOS, and Android. California AB 1043 mandates age assurance, but browsers have no Apple or Google age signal — A3 fills that gap. On native apps, A3 normalizes Apple's Declared Age Range API and Google's Play Age Signals into a single response. On the web, A3 provides full age assurance through passive signal fusion. One API call, one response format, one audit trail — regardless of platform. Zero data retention. No verification walls. No stored PII.
## Key Links
- [Documentation](https://www.a3api.io/docs)
- [API Playground](https://www.a3api.io/playground)
- [Pricing](https://www.a3api.io/pricing)
- [Developer Portal (Get API Key)](https://portal.a3api.io)
- [OpenAPI Spec](https://www.a3api.io/openapi.json)
- [AB 1043 Compliance Guide](https://www.a3api.io/docs/compliance/ab-1043)
- [Trust & Reliability](https://www.a3api.io/trust)
- [Privacy Policy](https://www.a3api.io/privacy)
- [Terms of Service](https://www.a3api.io/terms)
- [Browser SDK (`@a3api/signals`)](https://www.a3api.io/docs/integration/sdks#browser-sdk-a3apisignals)
- [Changelog](https://www.a3api.io/changelog)
- [Contact](https://www.a3api.io/contact)
## What A3 Does
A3 provides a REST API endpoint for **age assurance** across web, iOS, and Android. On native apps, it normalizes Apple and Google OS age signals into a single, consistent response. On the web — where no OS signal exists — it provides full age assurance through behavioral biometrics, input complexity, device context, and other passively collected signals. The core use case is California AB 1043 compliance across every platform.
### Core Capabilities
- **Unified Cross-Platform Age Assurance**: One API call (`POST /v1/assurance/assess-age`) works across web, iOS, and Android. On native apps, it normalizes Apple's Declared Age Range API and Google's Play Age Signals into a single response format. On the web, supplementary signals become the primary assessment mechanism — filling the gap where no OS signal exists.
- **Two-Phase Signal Fusion Engine**: Phase 1 treats the OS-provided age bracket as the primary indicator per §1798.501(b)(3)(A). Phase 2 scores five categories of supplementary evidence independently. The OS signal is overridden only when evidence meets the "clear and convincing" legal standard per §1798.501(b)(3)(B). Returns one of four verdicts: `CONSISTENT`, `OVERRIDE`, `REVIEW`, or `PROVISIONAL`. Supports touch-mode (mob
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| Domain | Title | Category | Country | Authority | llms.txt | llms-full.txt | Save |
|---|---|---|---|---|---|---|---|
| agekey.org | Store in session | interface Authentication and identity APIs and SDKs | — | 53 | ✓ | ||
| agego.com | AgeGO Docs | documentation Authentication and identity Documentation and reference | — | 62 | ✓ | ✓ | |
| kycaid.com | KYCAID | interface Finance and payments Cybersecurity +1 | — | 55 | ✓ | ||
| yoti.com | llms.txt for https://www.yoti.com/ | documentation | — | 47 | ✓ | ||
| idswyft.app | Idswyft | interface Cybersecurity Authentication and identity +1 | US | 46 | ✓ | ✓ | |
| agechecker.net | AgeChecker.Net | transactional Ecommerce Cybersecurity | US | 56 | ✓ | ||
| datingapi.io | Dating API | documentation APIs and SDKs | US | 45 | ✓ | ✓ | |
| authologic.com | Authologic | interface Cybersecurity Authentication and identity | PL | 50 | ✓ | ✓ |
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