Posted by the APIs.io catalog. APIs.io does not own or sell this API; you get access from the provider.
Tvarka ATK API Auth API covers the eID authentication ceremony, served under /v1/auth/*. It is part of the Tvarka ATK API, a single REST API estate for Lithuanian eID authentication and qualified electronic signing. The API reads the Lithuanian identity card itself, using either a physical smart-card reader or an NFC phone tap, through one request, polling, webhook and metering model. Developers building login or identity verification for Lithuanian users, and teams working under eIDAS, would be the natural audience. The provider describes the service as EU-resident and operated from Lithuania.
Published artifacts: OpenAPI, Postman collection, documentation and APIs.json.
Catalog ratings for the provider: Kin Score 74.1 (exemplar band) and Agent Readiness 48.1 (agent-native band, scored 2026-11-06).
Access: freemium with self-serve signup. The provider says it prices per successful operation, with no subscription or minimum.
Pricing: set by the provider
Condition: live hosted API listed in the APIs.io catalog. You call the provider's endpoint at https://atk.tvarka.pro/v1, and documentation is at https://atk.tvarka.pro/docs/.
Catalog listing: https://apis.io/apis/tvarka/tvarka-auth-api/ Provider: https://www.tvarka.pro/