GSTIN API

GSTIN API provides developer-friendly GST services for India, enabling real-time verification of GSTIN numbers, retrieval of taxpayer details, filing history, and e-invoicing status. The platform offers 20 free credits without requiring a credit card, making it accessible for developers and businesses to integrate GST compliance checks into their applications. It aims to simplify tax verification processes with a robust API, comprehensive documentation, and reliable performance.

GSTIN API publishes 2 API contracts indexed on the APIs.io network: Bulk API and Verification API. Tagged areas include Company, GST, India, and Taxation.

The GSTIN API catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

GSTIN API’s developer surface includes authentication, support, pricing, engineering blog, getting-started guide, API reference, and 22 more developer resources.

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42.4/100 developing ▼ -10.0 Agent 32/100 agent ready Heartbeat 97/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract 1 Agent Skills

Company GST India Taxation

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 42.4/100 · developing

Contract Quality 12.4 / 19

Developer Ergonomics 5.8 / 15

Access Clarity 6.5 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.8 / 9

Discoverability 4.2 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 38.7 — up to +12.3 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points
Access Clarity scores 43.4 — up to +11.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/gstinapi/apis.yml: open an issue on github.com/api-evangelist/gstinapi to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

GSTIN API Bulk API

Verify a list of GSTINs as an asynchronous job.

GSTIN API Verification API

Verify a single GSTIN.

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

gstinapi-bulk-job-fetch

AGENT SKILL

GSTIN API pricing

Prices published by GSTIN API, read 2026-10-18 from gstinapi.com/pricing.

Plan	Price
Standard	₹0.50/verification
Bulk	₹0.40/verification

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Gstinapi Plans Pricing

2 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

GSTIN API

SLA

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Gstinapi Context

9 classes · 47 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

GSTIN API API Rules

18 rules · 17 errors 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

BulkJobEnvelope

3 properties

JSON SCHEMA

BulkJobRequest

3 properties

JSON SCHEMA

BulkJob

11 properties

JSON SCHEMA

BulkResultRow

6 properties

JSON SCHEMA

Pagination

5 properties

JSON SCHEMA

TaxpayerEnvelope

4 properties

JSON SCHEMA

Security Posture 2

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

Gstinapi Authentication

1 scheme

SECURITY

Gstinapi Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Gstinapi Agentic Access

6 operations · 2 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: gstinapi
name: GSTIN API
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://gstinapi.com/images/og-image.png
description: GSTIN API provides developer-friendly GST services for India, enabling real-time verification of GSTIN numbers,
  retrieval of taxpayer details, filing history, and e-invoicing status. The platform offers 20 free credits without requiring
  a credit card, making it accessible for developers and businesses to integrate GST compliance checks into their applications.
  It aims to simplify tax verification processes with a robust API, comprehensive documentation, and reliable performance.
url: https://raw.githubusercontent.com/api-evangelist/gstinapi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-18 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-17'
modified: '2026-10-17'
tags:
- Company
- GST
- India
- Taxation
tags_raw:
- Company
- GST
- India
- Taxation
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/gstinapi-agentic-access.yml
- type: Plans
  url: plans/gstinapi-plans-pricing.yml
- type: Spectral
  url: rules/gstinapi-rules.yml
- type: JSONLD
  url: json-ld/gstinapi-context.jsonld
- type: Vocabulary
  url: vocabulary/gstinapi-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/gstinapi-data-model.yml
- type: Authentication
  url: authentication/gstinapi-authentication.yml
- type: ErrorCatalog
  url: errors/gstinapi-problem-types.yml
- type: Conformance
  url: conformance/gstinapi-conformance.yml
- type: LLMsTxt
  url: llms/gstinapi-llms.txt
- type: Hosts
  url: hosts/gstinapi-hosts.yml
- type: Vendors
  url: vendors/gstinapi-vendors.yml
- type: SDKs
  url: packages/gstinapi-packages.yml
- type: Packages
  url: packages/gstinapi-packages.yml
- type: TermsOfService
  url: https://gstinapi.com/terms
- type: Support
  url: https://gstinapi.com/google-sheets-gst-add-on/support
- type: StatusPage
  url: https://gstinapi.com/status
- type: PrivacyPolicy
  url: https://gstinapi.com/privacy
- type: Pricing
  url: https://gstinapi.com/pricing
- type: Login
  url: https://gstinapi.com/login
- type: GitHubOrganization
  url: https://github.com/dlminds
- type: DeveloperPortal
  url: https://gstinapi.com/developers
- type: Blog
  url: https://gstinapi.com/blog
- type: GettingStarted
  url: https://gstinapi.com/blog/gst-verification-vendor-onboarding
- type: APIReference
  url: https://gstinapi.com/docs
- type: DomainSecurity
  url: security/gstinapi-domain-security.yml
- type: Website
  url: https://gstinapi.com/
apis:
- aid: gstinapi:gstinapi-bulk-api
  name: GSTIN API Bulk API
  description: Verify a list of GSTINs as an asynchronous job.
  humanURL: https://gstinapi.com/docs
  tags:
  - Bulk
  properties:
  - type: OpenAPI
    url: openapi/gstinapi-bulk-api-openapi.yml
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-taxpayer-envelope-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-result-row-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-request-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-envelope-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-pagination-schema.json
- aid: gstinapi:gstinapi-verification-api
  name: GSTIN API Verification API
  description: Verify a single GSTIN.
  humanURL: https://gstinapi.com/docs
  tags:
  - Verification
  properties:
  - type: OpenAPI
    url: openapi/gstinapi-verification-api-openapi.yml
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-taxpayer-envelope-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-result-row-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-request-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-bulk-job-envelope-schema.json
  - type: JSONSchema
    url: json-schema/gstinapi-pagination-schema.json
x-enrichment:
  date: '2026-10-18'
  status: enriched
  artifacts_added: 29
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

GSTIN API — frequently asked questions

Does GSTIN API have an API?

Yes. APIs.io lists 2 APIs from GSTIN API, including GSTIN API Bulk API and GSTIN API Verification API.

Is there an OpenAPI specification for the GSTIN API?

Yes. APIs.io indexes 2 OpenAPI specifications for GSTIN API, each linked for download from this page.

How do I authenticate with the GSTIN API?

GSTIN API uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Gstinapi Authentication.

How much does the GSTIN API cost?

GSTIN API publishes its prices; its Standard plan is ₹0.50/verification as of 2026-10-18. APIs.io lists 2 pricing plans for GSTIN API, with each plan's price, limits and inclusions under Pricing on this page.

Is the GSTIN API ready for AI agents?

GSTIN API has a Kin Score of 42.4 out of 100 (developing) and an Agent Readiness score of 32.1 (agent-ready), scored by API Evangelist on 2026-11-06.

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