UPI, cards or net banking.
Prepaid INR credits through Cashfree. GST is shown before you pay and a tax invoice with our GSTIN follows every payment. No USD card, no forex markup.
All systems operationalAI InfrastructureOne Platform.
One Platform.
Every AI capability.
Paid in rupees.
OpenAI- and Anthropic-compatible APIs for chat, messages and embeddings. Pay by UPI, cards or net banking, get a GST invoice on every top-up, and keep the SDKs already in your code.
Base URL
https://api.topbilling.in/v1import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["TB_API_KEY"],
base_url="https://api.topbilling.in/v1",
)
response = client.chat.completions.create(
model="tb-gpt-6-astra",
messages=[{"role": "user", "content": "Summarise this ticket in one line."}],
)
print(response.choices[0].message.content)
Every response carries
x-request-id: tb_req_…, the same ID as its charge.Global AI models.
Local billing.
Change two lines.
The official OpenAI and Anthropic SDKs, plain HTTP and Claude Code. Set the base URL and use a Top Billing key and model ID.
One reservation, one settlement.
Failover hands a request to the next healthy route before anything billable happens, so a retry behind the scenes never charges you again.
One request. One route that works.
One charge.
01 · Request illustrative
Models and live pricesPriced per token,
Priced per token,
in rupees.
Each price is the model’s active pricing version: the row your requests are charged at. INR per 1M tokens, before GST.
ModelCapabilitiesContextInput / 1MOutput / 1M
tb-gpt-6-astraGPT-6 Astrachat · streaming · tools · vision1M₹345.60₹1,728tb-claude-fable-5Claude Fable 5chat · streaming · tools · vision1M₹345.60₹1,728tb-claude-fable-5-1Claude Fable 5.1chat · streaming · tools · vision1M₹345.60₹1,728tb-claude-opus-5Claude Opus 5chat · streaming · tools1M₹172.80₹864tb-claude-opus-5-5Claude Opus 5.5chat · streaming · tools1M₹138.24₹691.20tb-claude-sonnet-5Claude Sonnet 5chat · streaming · tools · vision1M₹69.12₹345.60Every request,
traced to its charge.
Usage lists each request with its model, tokens and charge, per key. The request ID in the response header is the same ID on the ledger row.
How usage worksRequestModelTokens in / outCharge
tb_req_7Kq2…tb-gpt-6-astra1,240 / 380₹1.0852
tb_req_9Fm4…tb-claude-fable-55,210 / 940₹3.4249
tb_req_2Hx8…tb-claude-fable-5-1860 / 210₹0.6601
tb_req_5Pa1…tb-claude-opus-53,020 / 1,160₹1.5241
Total₹6.6943
Built for developersChange two lines.
Change two lines.
Keep your code.
Chat Completions, Responses, Messages, Embeddings and Models at https://api.topbilling.in/v1. A parameter a model cannot honour is rejected with a clear 400, never silently ignored.
import os
from openai import OpenAI
-client = OpenAI(api_key=os.environ["OPENAI_API_KEY"])
+client = OpenAI(
+ api_key=os.environ["TB_API_KEY"],
+ base_url="https://api.topbilling.in/v1",
+)
response = client.chat.completions.create(
- model="<your-current-model>",
+ model="<top-billing-model-id>",
messages=messages,
)
When a route fails,
your bill does not.
Native-lane requests are never failed over behind your back. Everything else follows the model’s route order.
- ReserveAn upper bound is held from your credits before the request runs.
- Route A failsTimeout, overload or a 5xx, before anything billable was produced.
- Route B servesThe next healthy route answers the same request.
- Settle onceCharged on the tokens the model reported. The rest is released.
Straight answers.
More in the documentation and the legal documents.
What is Top Billing?
An AI API gateway operated by VD Enterprises, a GST-registered business in India. You call AI models through OpenAI- and Anthropic-compatible APIs and pay from prepaid credits in Indian rupees.
Do I need to change my code?
Usually two lines. Point the official OpenAI SDK at https://api.topbilling.in/v1, or the Anthropic SDK at https://api.topbilling.in, and use a Top Billing API key and model ID. A parameter a model cannot honour is rejected with a clear 400, never silently ignored.
Does Claude Code work?
Yes. Set ANTHROPIC_BASE_URL to https://api.topbilling.in, ANTHROPIC_AUTH_TOKEN to your Top Billing key and ANTHROPIC_MODEL to a model ID from the Models page. The Claude Code guide has the details.
How do I pay?
Add credits on the Billing page with UPI, cards or net banking through Cashfree, our payment gateway. Card, UPI and bank details are entered with the gateway and never reach our servers.
Do I get a GST invoice?
Yes. GST is shown before you pay, and a tax invoice carrying our GSTIN is on the Billing page after every successful payment.
Is there a subscription or platform fee?
No. Credits are prepaid in INR and charged per token at the model’s listed price on the pricing page. No subscription, no platform fee, no minimum monthly spend.
What happens when a route fails?
On models with failover enabled, a route that times out, is overloaded or returns a 5xx before producing anything billable hands the request to the next healthy route. The request is reserved once and settled once, so a failover never bills twice.
Can credits be refunded?
Credits are prepaid, non-transferable and usable only on Top Billing. Refunds follow the refunds and credits policy.
Start building
in minutes.
Create an account, add credits by UPI, create a key, and send your first request with the SDK already in your codebase.