Business · Live
E-Way Bill Validity Extension API
Extend validity on a consignment still in transit.
What the Extend Validity API does
Extend an e-way bill that will expire before the consignment arrives — a breakdown, a detour or a delay at a checkpoint. The portal only allows extension inside a window around the expiry time, so this is normally triggered automatically by a tracking system rather than by hand. Calls carry your own GST portal API credentials (GSTIN, username and password), so filings are made as you, on your own registration. We never file on our own account.
Popular use cases
- →Fleet systems extending bills automatically when a delivery slips
- →Long-haul transporters covering multi-day journeys
- →Exception handling for breakdowns and route diversions
curl -X POST https://apisathi.in/gw/v1/ewb-extend-validity-v1/ \
-H "X-API-Key: live_xxx" \
-H "Content-Type: application/json" \
-d '{ "gstin": "23BEFPJ5660F2ZP", "username": "your_portal_user", "password": "•••", "payload": { "ewbNo": 391000123456, "remainingDistance": 120, "extnRsnCode": 1 } }'{
"success": true,
"data": { "ewayBillNo": 391000123456, "validUpto": "07/09/2026" }
}Response fields returned by the Extend Validity API
| Field | Example |
|---|---|
| success | true |
| data.ewayBillNo | 391000123456 |
| data.validUpto | 07/09/2026 |
Every field, error code and the full schema are in the Extend Validity API reference.
Call the Extend Validity API from Node.js or Python
const res = await fetch('https://apisathi.in/gw/v1/ewb-extend-validity-v1/', {
method: 'POST',
headers: { 'X-API-Key': process.env.APISATHI_KEY, 'Content-Type': 'application/json' },
body: JSON.stringify({"gstin":"23BEFPJ5660F2ZP","username":"your_portal_user","password":"•••","payload":{"ewbNo":391000123456,"remainingDistance":120,"extnRsnCode":1}}),
});
const data = await res.json();import os, requests
res = requests.post(
"https://apisathi.in/gw/v1/ewb-extend-validity-v1/",
headers={"X-API-Key": os.environ["APISATHI_KEY"]},
json={"gstin":"23BEFPJ5660F2ZP","username":"your_portal_user","password":"•••","payload":{"ewbNo":391000123456,"remainingDistance":120,"extnRsnCode":1}},
timeout=30,
)
data = res.json()Extend Validity API pricing
- → From ₹3 per successful call + 18% GST
- → Prepaid wallet from ₹200; no monthly fee, no minimum volume
- → Failed or timed-out calls are not charged
- → Bonus credit on recharges of ₹1,000 and above; GST invoice on every recharge
Start in four steps
- Create a free account — about a minute.
- Call the Extend Validity API with your TEST key in the sandbox, free.
- Recharge the wallet (UPI, card or netbanking) from ₹200.
- Switch to your LIVE key — the same key works for every API.
Frequently asked questions
When can I extend?
Only within the window the portal allows around expiry — you cannot extend a bill long before it lapses, nor one that expired well in the past.
What if the extension is refused?
The portal’s reason is returned to you and the call is not charged.
How much does the Extend Validity API cost?
The Extend Validity API on API Sathi starts at ₹3 per successful call plus 18% GST, paid from a prepaid wallet. There is no monthly fee or minimum volume, and recharges of ₹1,000 or more earn bonus credit. Live prices for every API are on the pricing page.
Can I test the Extend Validity API for free?
Yes. Every account gets a TEST key that calls the Extend Validity API in the sandbox at no cost and returns realistic sample responses, so you can finish your integration before adding money to the wallet.
Am I charged if a Extend Validity API call fails?
No. You pay only for successful calls. If the source is unavailable, times out or rejects the request, the amount held for that call is released straight back to your wallet.
How do I get a Extend Validity API key?
Sign up at apisathi.in — it takes about a minute — and create a key under API Keys. Use the TEST key in the sandbox, then recharge from ₹200 and switch to a LIVE key. The same key works for every API on API Sathi.
Related APIs
Udyam Verification API
Confirm MSME status and pull the full Udyam record.
From ₹15/call
GST Verification API
Validate any GSTIN and fetch taxpayer details in one API call.
From ₹1.20/call
Company / CIN Verification API
Resolve companies, CINs, PANs and directors from the MCA graph.
From ₹3.60/call
E-Way Bill API
Generate an e-way bill for any consignment in a single API call.
From ₹3/call
E-Invoice API (IRN Generation)
Register an invoice and get its IRN, signed QR and acknowledgement.
From ₹3/call
E-Invoice Cancellation API
Cancel a registered IRN within the window the portal allows.
From ₹3/call
Start using the Extend Validity API today
Sign up, recharge a prepaid wallet and generate a key in minutes. Lowest price guaranteed, no volume commitment.