GST Enhanced
kybEnhanced GSTIN intelligence: taxpayer details, contacts, business nature PLUS the full GST return filing history (GSTR1 / GSTR3B / GSTR9 / GSTR9C) with filing dates, status, delayed flag and return-filing frequency. Use this to fetch a business’s GST returns.
POST /gw/v1/gst-enhanced-v1/SLA p95: 3000 ms
Authentication
Pass your key in the X-API-Key header. Use a test_ key against the sandbox and a live_ key in production. Send an optional Idempotency-Key header to safely retry — the same key returns the same response for 24h.
X-API-Key: live_xxxxxxxxxxxx
Request
Endpoint: POST https://apisathi.in/gw/v1/gst-enhanced-v1/
The trailing slash is required. /v1/gst-enhanced-v1/ works; /v1/gst-enhanced-v1 returns 404 Not Found. This applies to every product.
| Field | Type | Required | Constraints |
|---|---|---|---|
| gstin | string | required | pattern: ^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[0-9A-Z]{3}$ · 15-character GSTIN |
Code snippets
curl -X POST https://apisathi.in/gw/v1/gst-enhanced-v1/ \
-H "X-API-Key: $API_SATHI_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{"gstin":"27AAACR5055K1Z7"}'Response
| Field | Type | Required | Constraints |
|---|---|---|---|
| verified | boolean | optional | — |
| legal_name | string | optional | — |
| string | optional | — | |
| mobile_number | string | optional | — |
| nature_of_core_business | string | optional | — |
| aadhaar_verification_flag | string | optional | — |
| return_filing_frequency | object[] | optional | Filing frequency (Monthly/Quarterly) per quarter. |
| filing_status | object[] | optional | Recent GST return filings (GSTR1/3B/9/9C). |
| turnover_summary | object | optional | — |
| business_places | object[] | optional | — |
Sample response
{
"verified": true,
"legal_name": "RELIANCE INDUSTRIES LIMITED",
"email": "accounts@example.com",
"mobile_number": "98XXXXXXXX",
"nature_of_core_business": "Factory / Manufacturing, Retail Business",
"aadhaar_verification_flag": "Yes",
"return_filing_frequency": [
{
"fy": "2026-27",
"qtr": "Apr-Jun",
"frqncy": "Monthly"
}
],
"filing_status": [
{
"financial_year": "2026-2027",
"tax_return_period": "June",
"return_type": "GSTR1",
"mode_of_filing": "ONLINE",
"date_of_filing": "10/07/2026",
"filing_status": "Filed",
"is_delayed": false
},
{
"financial_year": "2026-2027",
"tax_return_period": "June",
"return_type": "GSTR3B",
"mode_of_filing": "ONLINE",
"date_of_filing": "20/07/2026",
"filing_status": "Filed",
"is_delayed": false
}
],
"turnover_summary": {
"slab": "Rs. 500 Cr. and above"
},
"business_places": [
{
"nature": "Principal Place of Business",
"address": "..."
}
]
}Reading a 400
A schema rejection returns INVALID_REQUEST with a details array naming the exact field. Read it before guessing — it gives you the JSON path and what was wrong with it.
{
"error": {
"code": "INVALID_REQUEST",
"message": "Request body failed schema validation",
"details": [
{ "path": "/callback_url",
"message": "unexpected property 'callback_url' — this endpoint does not accept unknown fields" }
]
}
}Most endpoints reject unknown top-level fields outright, so an extra key you added for your own bookkeeping will fail the call. Enum errors list the accepted values, and a missing required field is named with its full path.
Error codes
| Code | HTTP | When |
|---|---|---|
| INVALID_INPUT | 422 | The request was rejected as invalid — either it failed OUR schema validation (malformed input; not charged), or the upstream source rejected the value you sent. NOTE: an identifier that is well-formed but simply has NO RECORD is no longer an error — it returns 200 with `verified: false` and is charged (see the result-code table below). FIX the input before retrying; retrying the same value will fail again. |
| INVALID_API_KEY | 401 | Missing, malformed, or revoked X-API-Key. |
| OUT_OF_SCOPE | 403 | API key is not scoped for this product. |
| INSUFFICIENT_BALANCE | 402 | Wallet balance is below the per-call sale price. Recharge and retry. |
| RATE_LIMITED | 429 | Per-key RPS or RPM limit exceeded. Back off and retry after the Retry-After header. |
| PRODUCT_DEPRECATED | 410 | This API has been retired and is no longer available. Stop calling it — it will not return. Check the catalog for the current equivalent. |
| ROUTER_NO_VENDOR | 503 | No healthy vendor is currently available for this product. Transient — safe to retry after a short backoff. Not charged. |
| VENDOR_AUTH_FAILED | 502 | Upstream vendor rejected our credentials (our config issue). Not charged. |
| VENDOR_ERROR | 502 | A genuine transient upstream error (the source was briefly unavailable). Safe to RETRY after a short backoff. Not charged. NOTE: this is NOT for bad input — invalid values return 422 INVALID_INPUT, not 502. |
| TIMEOUT | 504 | Upstream vendor did not respond within the SLA window. Safe to retry after a short backoff. Not charged. |
| result_code 101 — match found | 200 | The record was found. `verified: true`. Charged. |
| result_code 102 — invalid input | 200 | The source rejected the identifier as invalid. `verified: false`. Charged — the source billed us for the lookup. Do not retry the same value. |
| result_code 103 — no record found | 200 | The lookup ran and matched nothing. `verified: false`. Charged. This is a definitive answer, NOT an outage — do not retry. |
| result_code 106 — multiple records | 200 | More than one record matched. `verified: false`. Charged. Narrow the input to disambiguate. |
| result_code 104 / 105 — source failure | 502 | The upstream source failed or returned something unreadable. Returned as VENDOR_ERROR and NOT charged. This is the only case worth retrying, with backoff. |
OpenAPI 3.1
Generated from this product's request/response JSON Schemas.
{
"openapi": "3.1.0",
"info": {
"title": "API Sathi — GST Enhanced",
"version": "1.0.0",
"description": "Enhanced GSTIN intelligence: taxpayer details, contacts, business nature PLUS the full GST return filing history (GSTR1 / GSTR3B / GSTR9 / GSTR9C) with filing dates, status, delayed flag and return-filing frequency. Use this to fetch a business’s GST returns."
},
"servers": [
{
"url": "https://apisathi.in/gw/v1"
}
],
"components": {
"securitySchemes": {
"ApiKeyAuth": {
"type": "apiKey",
"in": "header",
"name": "X-API-Key",
"description": "Your live or test key, e.g. `live_xxxxxxxxxxxx`."
}
}
},
"paths": {
"/gst-enhanced-v1": {
"post": {
"operationId": "gstEnhancedV1",
"tags": [
"kyb"
],
"summary": "GST Enhanced",
"description": "Enhanced GSTIN intelligence: taxpayer details, contacts, business nature PLUS the full GST return filing history (GSTR1 / GSTR3B / GSTR9 / GSTR9C) with filing dates, status, delayed flag and return-filing frequency. Use this to fetch a business’s GST returns.",
"security": [
{
"ApiKeyAuth": []
}
],
"parameters": [
{
"name": "Idempotency-Key",
"in": "header",
"required": false,
"schema": {
"type": "string"
},
"description": "Optional. Same key returns the same response for 24h."
}
],
"requestBody": {
"required": true,
"content": {
"application/json": {
"schema": {
"type": "object",
"required": [
"gstin"
],
"properties": {
"gstin": {
"type": "string",
"description": "15-character GSTIN",
"pattern": "^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[0-9A-Z]{3}$"
}
}
},
"example": {
"gstin": "27AAACR5055K1Z7"
}
}
}
},
"responses": {
"200": {
"description": "Successful, normalized response.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"verified": {
"type": "boolean"
},
"legal_name": {
"type": "string"
},
"email": {
"type": "string"
},
"mobile_number": {
"type": "string"
},
"nature_of_core_business": {
"type": "string"
},
"aadhaar_verification_flag": {
"type": "string"
},
"return_filing_frequency": {
"type": "array",
"description": "Filing frequency (Monthly/Quarterly) per quarter.",
"items": {
"type": "object",
"additionalProperties": true
}
},
"filing_status": {
"type": "array",
"description": "Recent GST return filings (GSTR1/3B/9/9C).",
"items": {
"type": "object",
"properties": {
"financial_year": {
"type": "string"
},
"tax_return_period": {
"type": "string"
},
"return_type": {
"type": "string"
},
"mode_of_filing": {
"type": "string"
},
"date_of_filing": {
"type": "string"
},
"filing_status": {
"type": "string"
},
"is_delayed": {
"type": "boolean"
}
},
"additionalProperties": true
}
},
"turnover_summary": {
"type": "object",
"additionalProperties": true
},
"business_places": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true
}
}
}
},
"example": {
"verified": true,
"legal_name": "RELIANCE INDUSTRIES LIMITED",
"email": "accounts@example.com",
"mobile_number": "98XXXXXXXX",
"nature_of_core_business": "Factory / Manufacturing, Retail Business",
"aadhaar_verification_flag": "Yes",
"return_filing_frequency": [
{
"fy": "2026-27",
"qtr": "Apr-Jun",
"frqncy": "Monthly"
}
],
"filing_status": [
{
"financial_year": "2026-2027",
"tax_return_period": "June",
"return_type": "GSTR1",
"mode_of_filing": "ONLINE",
"date_of_filing": "10/07/2026",
"filing_status": "Filed",
"is_delayed": false
},
{
"financial_year": "2026-2027",
"tax_return_period": "June",
"return_type": "GSTR3B",
"mode_of_filing": "ONLINE",
"date_of_filing": "20/07/2026",
"filing_status": "Filed",
"is_delayed": false
}
],
"turnover_summary": {
"slab": "Rs. 500 Cr. and above"
},
"business_places": [
{
"nature": "Principal Place of Business",
"address": "..."
}
]
}
}
}
},
"401": {
"description": "Missing, malformed, or revoked X-API-Key.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"402": {
"description": "Wallet balance is below the per-call sale price. Recharge and retry.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"403": {
"description": "API key is not scoped for this product.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"410": {
"description": "This API has been retired and is no longer available. Stop calling it — it will not return. Check the catalog for the current equivalent.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"422": {
"description": "The request was rejected as invalid — either it failed OUR schema validation (malformed input; not charged), or the upstream source rejected the value you sent. NOTE: an identifier that is well-formed but simply has NO RECORD is no longer an error — it returns 200 with `verified: false` and is charged (see the result-code table below). FIX the input before retrying; retrying the same value will fail again.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"429": {
"description": "Per-key RPS or RPM limit exceeded. Back off and retry after the Retry-After header.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"502": {
"description": "Upstream vendor rejected our credentials (our config issue). Not charged.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"503": {
"description": "No healthy vendor is currently available for this product. Transient — safe to retry after a short backoff. Not charged.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
},
"504": {
"description": "Upstream vendor did not respond within the SLA window. Safe to retry after a short backoff. Not charged.",
"content": {
"application/json": {
"schema": {
"type": "object",
"properties": {
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"call_id": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}
}
}