# Tvarka Sign API

**Canonical:** https://apis.io/apis/tvarka/tvarka-sign-api/  
**Provider:** Tvarka ATK API — https://apis.io/providers/tvarka/  
**Base URL:** https://sign-api.tvarka.pro  
**Documentation:** https://sign-api.tvarka.pro/docs

Tvarka Sign API is one of 10 APIs that [Tvarka ATK API](https://apis.io/providers/tvarka/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Digital Signature, QES, eIDAS, Lithuania, and OpenAPI. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, authentication docs, and rate-limit docs.

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.

## Machine-readable artifacts (16)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/openapi/tvarka-sign-api-openapi.yml
- **OpenAPI** — https://sign-api.tvarka.pro/openapi.json
- **Documentation** — https://sign-api.tvarka.pro/docs
- **APIReference** — https://sign-api.tvarka.pro/docs
- **MCPServer** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/mcp/tvarka-sign-api-mcp.yml
- **ToolCrosswalk** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/mcp/tvarka-sign-api-tool-crosswalk.yml
- **LLMsTxt** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/llms/tvarka-sign-api-llms.txt
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/authentication/tvarka-sign-api-authentication.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/errors/tvarka-sign-api-problem-types.yml
- **Webhooks** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/asyncapi/tvarka-sign-api-webhooks.yml
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/sandbox/tvarka-sign-api-sandbox.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/conventions/tvarka-sign-api-conventions.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/overlays/tvarka-sign-api-openapi-overlay.yaml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/data-model/tvarka-sign-api-data-model.yml
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/rate-limits/tvarka-sign-api-rate-limits.yml
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/skills/tvarka-sign-api-request-signatures.md

## Other Tvarka ATK API APIs (9)

- [Tvarka ATK API Auth API](https://apis.io/apis/tvarka/tvarka-atk-api-auth-api/)
- [Tvarka ATK API Erasure API](https://apis.io/apis/tvarka/tvarka-atk-api-erasure-api/)
- [Tvarka ATK API LTV API](https://apis.io/apis/tvarka/tvarka-atk-api-ltv-api/)
- [Tvarka ATK API Pairing API](https://apis.io/apis/tvarka/tvarka-atk-api-pairing-api/)
- [Tvarka ATK API Sign API](https://apis.io/apis/tvarka/tvarka-atk-api-sign-api/)
- [Tvarka ATK API Tvarka ATK API API](https://apis.io/apis/tvarka/tvarka-atk-api-tvarka-atk-api-api/)
- [Tvarka ATK API Tvarka ATK QES Signing API (paid Tier Addendum) API](https://apis.io/apis/tvarka/tvarka-atk-api-tvarka-atk-qes-signing-api-paid-tier-addendum-api/)
- [Tvarka ATK API Validation API](https://apis.io/apis/tvarka/tvarka-atk-api-validation-api/)
- [Tvarka ATK API Well Known API](https://apis.io/apis/tvarka/tvarka-atk-api-well-known-api/)

## Tags

Digital Signature, QES, eIDAS, Lithuania, OpenAPI, MCP, Webhook, Identity

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/tvarka/tvarka-sign-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/tvarka/.