# Strale Invoice Validate

> Strale Invoice Validate is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-09-13).

Validates invoice JSON for VAT number format, line item math, tax calculations, and EU compliance requirements, returning an auditable result with cryptographic chain hashing.

## Facts

- Endpoint: POST https://api.strale.io/x402/v2/invoice-validate
- Price: $0.0216/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strale-invoice-validate-08d87cd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_91ffD5CnpOeTjukB4UDyi

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 strale-invoice-validate-08d87cd1 -d '<json body>'
```

Example prompt: Can you validate this invoice for EU compliance — I need you to check the vendor VAT DE123456789, buyer VAT FR98765432100, the line items, and make sure all the tax calculations and totals add up correctly?

## When to prefer this

Choose this endpoint when you need invoice validation with cryptographic audit trails and EU VAT compliance checks across multiple countries. Prefer it over generic validation libraries when you need independently tested, auditable results with tamper-evident records — especially for cross-border EU transactions where VAT number validity and tax calculation accuracy are legally significant.

## Known failure modes

- Malformed invoice JSON returns a parsing error
- Invalid or missing required fields (vendor_vat, buyer_vat, line_items) return a field validation error
- Unsupported country VAT format returns an unrecognized format error
- Network timeout returns a 504 error
- Insufficient USDC balance or failed x402 payment returns a 402 Payment Required error

## How this service works

The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.

## Output

Returns a structured validation result indicating whether the invoice passes or fails compliance checks, with specific errors for VAT number format issues, line item math discrepancies, incorrect tax calculations, or EU compliance violations. Each call also returns a cryptographic audit record with chain hashing for traceability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "invoice"
     ],
     "properties": {
      "invoice": {
       "type": "object",
       "description": "Invoice JSON with vendor_vat, buyer_vat, amounts, line_items"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strale-invoice-validate-08d87cd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)