# BaseBuilder Ecommerce Sales Tax Calculator

> BaseBuilder Ecommerce Sales Tax Calculator is a paid API for AI agents from bb-ecommerce-three.vercel.app, paid per call via x402, $0.115412/call, status unknown (last checked 2026-09-15).

Calculates sales tax for ecommerce transactions based on location and order details

## Facts

- Endpoint: POST https://bb-ecommerce-three.vercel.app/api/sales-tax-calculator
- Price: $0.115412/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-ecommerce-sales-tax-calculator-139a2673
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fL6_niCcM2mnVP86CaSXM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability basebuilder-ecommerce-sales-tax-calculator-139a2673 -d '<json body>'
```

Example prompt: What's the sales tax on a $149.99 order being shipped to Austin, Texas 78701 — it's a general merchandise product and I need the exact dollar amount and rate to display at checkout.

## When to prefer this

Use this endpoint when you need real-time sales tax calculation for US ecommerce transactions at checkout, especially when you need per-jurisdiction accuracy and are already operating within the BaseBuilder Ecommerce API ecosystem using x402 micropayments.

## Known failure modes

- Invalid or unrecognized zip code returns an error
- Missing required fields such as amount or location cause a 400 bad request
- Unsupported jurisdiction or territory may return null tax data
- Payment failure via x402 protocol results in 402 Payment Required
- Malformed request body returns validation error

## How this service works

BaseBuilder Ecommerce API hub - 19 paid endpoints

## Output

Returns the applicable sales tax rate and dollar amount for the given order, including jurisdiction-level breakdown and the final total with tax applied.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-ecommerce-sales-tax-calculator-139a2673/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-ecommerce-three.vercel.app](https://www.zero.xyz/host/bb-ecommerce-three.vercel.app/llms.txt)