# QuantaFlow Rapid Sales Tax Calculator

> QuantaFlow Rapid Sales Tax Calculator is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Calculates sales tax rates and amounts for given transactions via a pay-per-call x402 gateway, proxying requests to an upstream rapid sales tax API.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/rapid-sales-tax-calculator?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-rapid-sales-tax-calculator-68d5a6fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xp2CRc_X0EV6BlbgyS7Y4

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 quantaflow-rapid-sales-tax-calculator-68d5a6fd -d '<json body>'
```

Example prompt: Can you calculate the sales tax on a $200 purchase being shipped to Austin, Texas? The item is a general merchandise product.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call sales tax calculation without a subscription commitment, particularly in web3-native or agent-driven workflows that already support x402 micropayments. Ideal for low-volume or sporadic tax lookups where per-call $0.01 USDC pricing is more economical than a monthly SaaS plan.

## Known failure modes

- Payment failure: insufficient USDC balance or invalid x402 payment header results in 402 Payment Required
- Missing or malformed body/query parameters cause upstream validation errors
- Unsupported location or ZIP code returns empty or error response from upstream
- Network timeout proxying to upstream rapid sales tax API
- Invalid JSON body format leads to parse errors
- Upstream API outage results in gateway-level 502 or 503 response

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

Returns the upstream sales tax calculator's response, including the applicable tax rate, computed tax amount, and jurisdiction details for the queried transaction, passed through after a successful $0.01 USDC x402 micropayment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-rapid-sales-tax-calculator-68d5a6fd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)