name: Tvarka ATK API description: >- A single REST API for Lithuanian eID authentication and qualified electronic signing (QES), plus validation, timestamping and long-term-validation (LTV)/archive trust services. The primary ceremonies read the Lithuanian identity card (ATK) through a physical smart-card reader or an NFC phone tap, with Smart-ID and Mobile-ID as optional server-side methods under the same request, polling, webhook and metering model. Signing produces PAdES, ASiC-E, ADOC or detached CAdES artifacts with a qualified timestamp and an advisory validation axis. eIDAS-aligned and EU-resident, operated from Lithuania by Advokato M. Kiskio kontora INVENT and Socialiniai algoritmai, UAB, and priced per successful operation with no subscription or minimum. image: https://tvarka.pro/static/img/tvarka-logo-closer.53b2d1b2a9b0.svg url: https://tvarka-atk-api.apievangelist.com/apis.yml created: '2026-08-02' modified: '2026-08-09' specificationVersion: '0.21' tags: - Authentication - Digital Signature - eIDAS - QES - Lithuania - OpenAPI - eID - Smart-ID - Mobile-ID - NFC - Timestamping - LTV - Webhooks - Identity - Trust Services - GDPR apis: - aid: tvarka-atk-api:tvarka-atk-api-auth-api name: Tvarka ATK API Auth API description: The eID authentication ceremony (`/v1/auth/*`). humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Auth properties: - type: OpenAPI url: openapi/tvarka-atk-api-auth-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-erasure-api name: Tvarka ATK API Erasure API description: The Erasure API from Tvarka ATK API — 3 operation(s) for erasure. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Erasure properties: - type: OpenAPI url: openapi/tvarka-atk-api-erasure-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-ltv-api name: Tvarka ATK API LTV API description: Post-signature timestamp and long-term-validation upgrades. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - LTV properties: - type: OpenAPI url: openapi/tvarka-atk-api-ltv-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-pairing-api name: Tvarka ATK API Pairing API description: NFC remote pairing - complete a request by tapping a card on a different device. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Pairing properties: - type: OpenAPI url: openapi/tvarka-atk-api-pairing-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-sign-api name: Tvarka ATK API Sign API description: The QES signing ceremony (`/v1/sign/*`). humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Sign properties: - type: OpenAPI url: openapi/tvarka-atk-api-sign-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-tvarka-atk-api-api name: Tvarka ATK API Tvarka ATK API API description: The Tvarka ATK API API from Tvarka ATK API — 0 operation(s) for tvarka atk api. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Tvarka ATK API properties: - type: OpenAPI url: openapi/tvarka-atk-api-tvarka-atk-api-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-tvarka-atk-qes-signing-api-paid-tier-addendum-api name: Tvarka ATK API Tvarka ATK QES Signing API (paid Tier Addendum) API description: >- The Tvarka ATK QES Signing API (paid Tier Addendum) API from Tvarka ATK API — 0 operation(s) for tvarka atk qes signing api (paid tier addendum). humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Tvarka ATK QES Signing API (paid Tier Addendum) properties: - type: OpenAPI url: openapi/tvarka-atk-api-tvarka-atk-qes-signing-api-paid-tier-addendum-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-validation-api name: Tvarka ATK API Validation API description: Standalone advisory validation of signed artifacts. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Validation properties: - type: OpenAPI url: openapi/tvarka-atk-api-validation-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json - aid: tvarka-atk-api:tvarka-atk-api-well-known-api name: Tvarka ATK API Well Known API description: Keys for verifying the optional `assertion` JWT. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Well-known properties: - type: OpenAPI url: openapi/tvarka-atk-api-well-known-api-openapi.yml - type: PostmanCollection url: https://atk.tvarka.pro/postman/auth.json - type: PostmanCollection url: https://atk.tvarka.pro/postman/sign.json - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIsJSON url: https://atk.tvarka.pro/apis.json maintainers: - FN: Tvarka API team email: info@tvarka.pro organizationName: Tvarka url: https://tvarka.pro generated: by: apis.io/add model: claude-opus-4-8 confidence: 95 at: '2026-08-02T22:54:13.353Z' x-enrichment: date: '2026-08-09' status: enriched artifacts_added: 36 pass: local-v1 common: - type: AgenticAccess url: agentic-access/tvarka-atk-api-agentic-access.yml - type: DomainSecurity url: security/tvarka-atk-api-domain-security.yml - type: Authentication url: authentication/tvarka-atk-api-authentication.yml - type: DeveloperPortal url: https://atk.tvarka.pro/docs/ - type: Documentation url: https://atk.tvarka.pro/docs/ - type: APIReference url: https://atk.tvarka.pro/docs/api/ - type: GettingStarted url: https://atk.tvarka.pro/docs/quickstart/ - type: Support url: https://tvarka.pro/kontaktai/ - type: SignUp url: https://atk.tvarka.pro/docs/access/ - type: Pricing url: https://atk.tvarka.pro/docs/pricing/ - type: TermsOfService url: https://tvarka.pro/salygos/ - type: PrivacyPolicy url: https://tvarka.pro/privatumas/ - type: Postman name: Authentication collection url: https://atk.tvarka.pro/postman/auth.json - type: Postman name: Signing and services collection url: https://atk.tvarka.pro/postman/sign.json - type: Packages url: packages/tvarka-atk-api-packages.yml - type: SDKs url: packages/tvarka-atk-api-packages.yml - type: WellKnown url: well-known/tvarka-atk-api-well-known.yml - type: LLMsTxt url: llms/tvarka-atk-api-llms.txt - type: MCPServer url: mcp/tvarka-atk-api-mcp.yml - type: Overlay url: overlays/tvarka-atk-api-openapi-overlay.yaml - type: Conformance url: conformance/tvarka-atk-api-conformance.yml - type: Compliance url: https://tvarka.pro/saugumas/ - type: ErrorCatalog url: errors/tvarka-atk-api-problem-types.yml - type: Lifecycle url: lifecycle/tvarka-atk-api-lifecycle.yml - type: StatusPage url: https://atk.tvarka.pro/status/ - type: Deprecation url: https://atk.tvarka.pro/docs/lifecycle/ - type: ChangeLog url: changelog/tvarka-atk-api-changelog.yml - type: Security url: https://tvarka.pro/saugumas/ - type: VulnerabilityDisclosure url: security/tvarka-atk-api-vulnerability-disclosure.yml - type: Sandbox url: sandbox/tvarka-atk-api-sandbox.yml - type: Conventions url: conventions/tvarka-atk-api-conventions.yml - type: Idempotency url: conventions/tvarka-atk-api-conventions.yml - type: Webhooks url: asyncapi/tvarka-atk-api-webhooks.yml - type: DataModel url: data-model/tvarka-atk-api-data-model.yml - type: Examples url: examples/tvarka-atk-api-examples.yml - type: RateLimits url: rate-limits/tvarka-atk-api-rate-limits.yml - type: Plans url: plans/tvarka-atk-api-plans.yml - type: AgentSkill url: skills/_index.yml - type: Arazzo name: Authenticate a person with a Lithuanian eID card url: arazzo/tvarka-atk-api-authenticate-eid-card.yml - type: Arazzo name: Sign a PDF with a qualified electronic signature url: arazzo/tvarka-atk-api-sign-pades-document.yml - type: Arazzo name: Validate, timestamp and archive an existing signed document url: arazzo/tvarka-atk-api-timestamp-and-archive.yml