Tvarka ATK API website screenshot

Tvarka ATK API

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.

Tvarka ATK API publishes 10 APIs on the APIs.io network, including Auth API, Erasure API, LTV API, and 7 more. Tagged areas include Authentication, Digital Signature, eIDAS, QES, and Lithuania.

The Tvarka ATK API catalog on APIs.io includes 2 event-driven AsyncAPI specifications.

Tvarka ATK API’s developer surface includes authentication, documentation, API reference, getting-started guide, support, signup flow, pricing, and 47 more developer resources.

🌐 Visit website 📡 Source on GitHub
66.3/100 strong ▬ flat Agent 51/100 agent native saas Full breakdown ↓
scored 2026-09-01 · rubric v0.17.2
4 APIs 1 MCP Servers
AuthenticationDigital SignatureeIDASQESLithuaniaOpenAPIeIDSmart-IDMobile-IDNFCTimestampingLTVWebhookIdentityTrust ServicesGDPR

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-01 · rubric v0.17.2
Composite quality — 66.3/100 · strong
Contract Quality 15.4 / 25
Developer Ergonomics 16.2 / 20
Access Clarity 16.8 / 20
Operational Transparency 7.5 / 13
Contract Governance 2.2 / 12
Discoverability 8.2 / 10
Agent readiness — 51/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Surface 0 / 5
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tvarka: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Tvarka ATK API Auth API

The eID authentication ceremony (`/v1/auth/*`).

Tvarka ATK API Erasure API

The Erasure API from Tvarka ATK API — 3 operation(s) for erasure.

Tvarka ATK API LTV API

Post-signature timestamp and long-term-validation upgrades.

Tvarka ATK API Pairing API

NFC remote pairing - complete a request by tapping a card on a different device.

Tvarka ATK API Sign API

The QES signing ceremony (`/v1/sign/*`).

Tvarka ATK API Tvarka ATK API API

The Tvarka ATK API API from Tvarka ATK API — 0 operation(s) for tvarka atk api.

Tvarka ATK API Tvarka ATK QES Signing API (paid Tier Addendum) API

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).

Tvarka ATK API Validation API

Standalone advisory validation of signed artifacts.

Tvarka ATK API Well Known API

Keys for verifying the optional `assertion` JWT.

Tvarka Sign API

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 Tvar...

Scroll for all 10

Open Collections 10

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Tvarka Atk Auth API

OPEN COLLECTION

Tvarka Atk Erasure API

OPEN COLLECTION

Tvarka Atk LTV API

OPEN COLLECTION

Tvarka Atk Pairing API

OPEN COLLECTION

Tvarka Atk Sign API

OPEN COLLECTION

Tvarka ATK Tvarka ATK API API

OPEN COLLECTION

Tvarka ATK - QES Signing API (paid-tier addendum) Tvarka ATK QES Signing API (paid Tier Addendum) Tvarka ATK QES Signing API (paid Tier Addendum) API

OPEN COLLECTION

Tvarka Atk Validation API

OPEN COLLECTION

Tvarka Atk Well Known API

OPEN COLLECTION

Scroll for all 10

Arazzo Workflows 3

Multi-step API workflows described with the Arazzo specification.

Authenticate a person with a Lithuanian eID card

The full ATK authentication ceremony - create an audience-bound request on the backend, submit the card certificate, return the card signature, and read the verified identity.

ARAZZO

Sign a PDF with a qualified electronic signature

The ATK signing ceremony for a PAdES container - create the request, submit the card signing certificate, return the signature, check both result axes, then download the signed ...

ARAZZO

Validate, timestamp and archive an existing signed document

The three stateless trust services in sequence - validate a container, add qualified timestamps to untimestamped XAdES, upgrade PAdES B-T to B-LT, then download the output.

ARAZZO

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Tvarka Sign

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Tvarka Atk Api Plans

3 plans

PLANS

Rate Limits 2

Documented rate limits and quota policies.

Tvarka Atk Api Rate Limits

0 limits

RATE LIMITS

Tvarka Sign Api Rate Limits

1 limits

RATE LIMITS

Event Specifications 2

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Tvarka Atk Api Webhooks

ASYNCAPI

Tvarka Sign Api Webhooks

ASYNCAPI

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Tvarka Atk Api Authentication

http/apiKey · 3 schemes

SECURITY

Tvarka Sign Api Authentication

http · 1 scheme

SECURITY

Tvarka Atk Api Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Tvarka Atk Api Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Tvarka Agentic Access

44 operations · 31 acting · 15 human-in-the-loop

44 operations · 31 acting

AGENTIC

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Sandbox
Sandbox
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 WellKnown
WellKnown
 LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 14

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Idempotency
Idempotency
 Webhooks
Webhooks
 DataModel
DataModel
 Arazzo
Arazzo
 Arazzo
Arazzo
 Arazzo
Arazzo
 Webhooks
Webhooks
 ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 DataModel
DataModel

Scroll for all 14

Build 6

SDKs, sample code, and the tooling you integrate with

Postman
Postman
 Postman
Postman
 Packages
Packages
 SDKs
SDKs
 Examples
Examples
 ToolCrosswalk
ToolCrosswalk

Access & Security 7

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 Compliance
Compliance
 Security
Security
 VulnerabilityDisclosure
VulnerabilityDisclosure
 SecurityTxt
SecurityTxt
 Authentication
Authentication

Scroll for all 7

Operate 7

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 Deprecation
Deprecation
 ChangeLog
ChangeLog
 RateLimits
RateLimits
 HelpCenter
HelpCenter
 RateLimits
RateLimits

Scroll for all 7

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Other 3

Properties that don't map to a standard resource type

Overlay
Overlay
 APIsJSON
APIsJSON
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
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
image: https://tvarka.pro/static/img/tvarka-logo-closer.53b2d1b2a9b0.svg
url: https://atk.tvarka.pro/apis.json
created: '2026-08-02'
modified: '2026-08-31'
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-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-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: 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-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
  tags_raw:
  - 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
- 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
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: 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

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/tvarka"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/tvarka/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/tvarka/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.