Business · Live
E-Way Bill Part-B Update API
Attach or change the vehicle and transport details on an existing bill.
What the Update Part-B API does
Update Part-B on an e-way bill — the vehicle number, transport mode and transporter document — after the bill has been generated. Required whenever a vehicle changes mid-journey, which is the most common reason an otherwise valid bill is challenged. 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
- →Transport management systems recording vehicle changes in transit
- →Fleet operators reassigning consignments between vehicles
- →Logistics platforms completing Part-B after a dispatch is loaded
curl -X POST https://apisathi.in/gw/v1/ewb-update-partb-v1/ \
-H "X-API-Key: live_xxx" \
-H "Content-Type: application/json" \
-d '{ "gstin": "23BEFPJ5660F2ZP", "username": "your_portal_user", "password": "•••", "payload": { "ewbNo": 391000123456, "vehicleNo": "MH12AB1234", "reasonCode": "1" } }'{
"success": true,
"data": { "ewayBillNo": 391000123456, "vehUpdDate": "31/08/2026" }
}Response fields returned by the Update Part-B API
| Field | Example |
|---|---|
| success | true |
| data.ewayBillNo | 391000123456 |
| data.vehUpdDate | 31/08/2026 |
Every field, error code and the full schema are in the Update Part-B API reference.
Call the Update Part-B API from Node.js or Python
const res = await fetch('https://apisathi.in/gw/v1/ewb-update-partb-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,"vehicleNo":"MH12AB1234","reasonCode":"1"}}),
});
const data = await res.json();import os, requests
res = requests.post(
"https://apisathi.in/gw/v1/ewb-update-partb-v1/",
headers={"X-API-Key": os.environ["APISATHI_KEY"]},
json={"gstin":"23BEFPJ5660F2ZP","username":"your_portal_user","password":"•••","payload":{"ewbNo":391000123456,"vehicleNo":"MH12AB1234","reasonCode":"1"}},
timeout=30,
)
data = res.json()Update Part-B 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 Update Part-B 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
Why does Part-B matter?
A bill without valid Part-B details is treated as incomplete in transit. Updating it whenever the vehicle changes is what keeps the consignment compliant.
How many times can I update it?
As often as the journey requires — each update is a separate call at ₹3.
How much does the Update Part-B API cost?
The Update Part-B 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 Update Part-B API for free?
Yes. Every account gets a TEST key that calls the Update Part-B 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 Update Part-B 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 Update Part-B 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 Update Part-B API today
Sign up, recharge a prepaid wallet and generate a key in minutes. Lowest price guaranteed, no volume commitment.