# SignalDesk AI VAT Calculator

> SignalDesk AI VAT Calculator is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Computes VAT tax amount and gross price from a net amount and a caller-supplied VAT rate percentage

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/finance/vat-add?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-vat-calculator-dce58eeb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ofLVh9ISPOH8ODfSuYIFz

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 signaldesk-ai-vat-calculator-dce58eeb -d '<json body>'
```

Example prompt: I need to add 20% VAT to a net price of 250 — can you calculate the tax amount and total gross price for me?

## When to prefer this

Use this endpoint when you need a quick, stateless VAT/tax addition computation and already know the applicable rate — it does not look up jurisdiction-specific rates or provide tax advice. Prefer it for invoice generation, pricing display, or quoting workflows where the rate is externally determined and you just need the arithmetic performed as a paid micro-service call.

## Known failure modes

- net or rate_percent missing or null — likely returns a 4xx validation error
- rate_percent exceeds 1000 or is negative — rejected by schema validation
- net exceeds 1,000,000,000,000 — rejected by schema maximum
- Floating-point precision issues for very large or very small values — result may have minor rounding artifacts
- Payment not included or rejected — returns HTTP 402 requiring x402 micropayment of $0.001 USDC

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

A JSON object containing the original net amount, the computed tax amount (net × rate/100), and the gross amount (net + tax), along with a disclaimer notice that the result is a mathematical calculation from supplied inputs only and does not constitute tax, investment, or lending advice.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "net": {
   "type": "number",
   "maximum": 1000000000000,
   "minimum": 0,
   "description": "Amount in one consistent currency; floating-point calculation, not an accounting ledger."
  },
  "rate_percent": {
   "type": "number",
   "maximum": 1000,
   "minimum": 0,
   "description": "Supplied percentage rate, not a fetched or recommended rate."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "net": 100,
  "tax": 23,
  "gross": 123,
  "notice": "Calculation from supplied inputs only; no tax, investment or lending advice."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-vat-calculator-dce58eeb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)