name: Tvarka ATK API description: A single REST API estate for Lithuanian eID authentication and qualified electronic signing (QES). The ATK API reads the Lithuanian identity card itself - physical smart-card reader or NFC phone tap - through one request, polling, webhook and metering model, and adds standalone validation, timestamping and long-term-validation (LTV)/archive trust services; contract 1.4.0 withdrew the short-lived Smart-ID and Mobile-ID passthrough, so the ATK surface is deliberately card-only. Hosted remote-method ceremonies moved to the separate Tvarka Sign API (sign-api.tvarka.pro), an orchestration contract with RFC 9457 problem details and a live, anonymously introspectable MCP server at /mcp. 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. deliveryModel: model: saas open_source: false commercial: true callable_host: true label: Hosted service · you call their endpoint confidence: high source: - openapi - pricing generated: '2026-08-28' method: derived accessModel: pricing: freemium onboarding: self-serve trial: false try_now: true public: false label: Freemium · Self-serve signup confidence: high source: - plans - authentication - rate-limits - security - sandbox generated: '2026-09-02' method: derived image: https://tvarka.pro/static/img/tvarka-logo-closer.53b2d1b2a9b0.svg url: https://atk.tvarka.pro/apis.json created: '2026-08-02' modified: '2026-09-16' specificationVersion: '0.23' tags: - Authentication - Digital Signature - eIDAS - QES - Lithuania - OpenAPI - eID - Smart-ID - Mobile-ID - NFC - Timestamping - LTV - Webhook - Identity - Trust Services - GDPR tags_raw: - 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-tvarka-atk-api-api name: Tvarka ATK API Tvarka ATK 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: 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: [] tags_raw: - Tvarka ATK QES Signing API (paid Tier Addendum) properties: - 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-sign-api name: Tvarka Sign API description: >- Machine channel for Tvarka Sign: post a document and a list of signers and Tvarka runs its ordinary qualified signing ceremony for each of them on the hosted page or in the Tvarka Sign mobile app (LT ATK over NFC, Smart-ID, Mobile-ID). Nothing in the API signs anything - a signature is always a human act with the signer's own eID - so every operation is about getting a document in front of the right person and learning what they did. Orchestration sibling of the card-level ATK API; RFC 9457 problem details, HMAC-signed webhooks, and a hosted MCP server. version: 1.2.1 created: '2026-08-31' modified: '2026-08-31' baseURL: https://sign-api.tvarka.pro humanURL: https://sign-api.tvarka.pro/docs tags: - Digital Signature - QES - eIDAS - Lithuania - OpenAPI - MCP - Webhook - Identity tags_raw: - Digital Signature - QES - eIDAS - Lithuania - OpenAPI - MCP - Webhooks - Identity properties: - type: OpenAPI url: openapi/tvarka-sign-api-openapi.yml - type: OpenAPI name: Provider-hosted contract url: https://sign-api.tvarka.pro/openapi.json mediaType: application/vnd.oai.openapi+json;version=3.1 - type: Documentation url: https://sign-api.tvarka.pro/docs - type: APIReference url: https://sign-api.tvarka.pro/docs - type: MCPServer url: mcp/tvarka-sign-api-mcp.yml - type: ToolCrosswalk url: mcp/tvarka-sign-api-tool-crosswalk.yml - type: LLMsTxt url: llms/tvarka-sign-api-llms.txt - type: Authentication url: authentication/tvarka-sign-api-authentication.yml - type: ErrorCatalog url: errors/tvarka-sign-api-problem-types.yml - type: Webhooks url: asyncapi/tvarka-sign-api-webhooks.yml - type: Sandbox url: sandbox/tvarka-sign-api-sandbox.yml - type: Conventions url: conventions/tvarka-sign-api-conventions.yml - type: Overlay url: overlays/tvarka-sign-api-openapi-overlay.yaml - type: DataModel url: data-model/tvarka-sign-api-data-model.yml - type: RateLimits url: rate-limits/tvarka-sign-api-rate-limits.yml - type: AgentSkill url: skills/tvarka-sign-api-request-signatures.md - aid: tvarka:tvarka-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: - Authentication tags_raw: - Auth properties: - type: OpenAPI url: openapi/tvarka-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:tvarka-batches-api name: Tvarka ATK API Batches API description: The Batches API from Tvarka ATK API — 2 operation(s) for batches. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Batches properties: - type: OpenAPI url: openapi/tvarka-batches-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:tvarka-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-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:tvarka-files-api name: Tvarka ATK API Files API description: The Files API from Tvarka ATK API — 2 operation(s) for files. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - File tags_raw: - Files properties: - type: OpenAPI url: openapi/tvarka-files-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:tvarka-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-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:tvarka-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-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:tvarka-signings-api name: Tvarka ATK API Signings API description: Create and follow a signing. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Signings properties: - type: OpenAPI url: openapi/tvarka-signings-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:tvarka-tvarka-atk-api-api name: Tvarka ATK API Tvarka ATK 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-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:tvarka-tvarka-sign-api-api name: Tvarka ATK API Tvarka Sign API description: The Tvarka Sign API API from Tvarka ATK API — 0 operation(s) for tvarka sign api. humanURL: https://atk.tvarka.pro/docs/ baseURL: https://atk.tvarka.pro/v1 tags: - Tvarka Sign API properties: - type: OpenAPI url: openapi/tvarka-tvarka-sign-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:tvarka-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-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:tvarka-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 tags_raw: - Well-known properties: - type: OpenAPI url: openapi/tvarka-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://atk.tvarka.pro/docs/ generated: by: apis.io/add model: claude-opus-4-8 confidence: 95 at: '2026-08-02T22:54:13.353Z' x-enrichment: date: '2026-08-31' status: enriched artifacts_added: 17 pass: local-v1 common: - type: CapabilityMap url: capabilities/tvarka-capability-edges.yml name: Tvarka ATK API Business Capability Map - type: Website url: https://www.tvarka.pro/ - type: AgenticAccess url: agentic-access/tvarka-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-sign-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 - type: ToolCrosswalk url: mcp/tvarka-sign-api-tool-crosswalk.yml - type: SecurityTxt url: well-known/tvarka-security.txt - type: APIsJSON url: https://atk.tvarka.pro/apis.json - type: LLMsTxt name: Tvarka Sign API (provider-published) url: llms/tvarka-sign-api-llms.txt - type: Webhooks name: Tvarka Sign API signing events url: asyncapi/tvarka-sign-api-webhooks.yml - type: ErrorCatalog name: Tvarka Sign API RFC 9457 problem types url: errors/tvarka-sign-api-problem-types.yml - type: Sandbox name: Tvarka Sign API sandbox url: sandbox/tvarka-sign-api-sandbox.yml - type: Conventions name: Tvarka Sign API conventions url: conventions/tvarka-sign-api-conventions.yml - type: Authentication name: Tvarka Sign API authentication url: authentication/tvarka-sign-api-authentication.yml - type: HelpCenter url: https://tvarka.pro/pagalba/ - type: Overlay name: Tvarka Sign API overlay url: overlays/tvarka-sign-api-openapi-overlay.yaml - type: DataModel name: Tvarka Sign API data model url: data-model/tvarka-sign-api-data-model.yml - type: RateLimits name: Tvarka Sign API rate limits url: rate-limits/tvarka-sign-api-rate-limits.yml type: Index position: Producing access: 3rd-Party