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402utils Factur-X / ZUGFeRD Invoice Validator
x402
402utils Factur-X / ZUGFeRD Invoice Validator is a paid API for AI agents from 402utils.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Validates a Factur-X or ZUGFeRD invoice (PDF, CII XML, or URL) against PDF/A-3 structure, EN 16931 CII rules, arithmetic checks, and French Flux 2 requirements, returning a detailed rule-based compliance report.
Price / call$0.005
Success—
StatusUnknown
How this service works
Validate a Factur-X / ZUGFeRD invoice: send PDF bytes, JSON { url } or { pdfBase64 }, or raw CII { xml }. Returns a rule-based report — PDF/A-3 structure, EN 16931 CII anchors, arithmetic rules (BR-CO) and French PA « Flux 2 » checks (BR-FR) — with the detected profile. Structural + heuristic, not a certified conformance service. ?attest=1 → Ed25519-signed audit trail.
Output
A rule-based compliance report covering PDF/A-3 structural checks, EN 16931 CII anchor conformance, arithmetic (BR-CO) rules, and French public administration Flux 2 (BR-FR) checks, along with the detected Factur-X/ZUGFeRD profile. If attest=1 is passed, includes an Ed25519-signed audit trail of the validation result.
Example use cases
Batch validate French supplier invoices
“I've got a folder of ZUGFeRD invoices from our French suppliers. Can you check each one against Flux 2 rules and give me a summary of which ones have arithmetic errors or structural problems?”
Pre-submission compliance check for PA
“Before I submit these invoices to the French public administration portal, I need to make sure they're all properly formatted and compliant with EN 16931. Can you validate the batch and flag any that won't pass?”
Automated invoice intake validation
“We're setting up an automated invoice processing pipeline and need to validate incoming Factur-X PDFs from customers. Can you check them for PDF/A-3 structure, CII compliance, and give us signed audit trails we can store in our compliance system?”
Technical details
Endpoint
POSThttps://402utils.com/v1/facturx-validateWhen to prefer
Use this endpoint when you need a quick, paid, automated check of a Factur-X or ZUGFeRD e-invoice against EN 16931 CII rules, PDF/A-3 structure, arithmetic constraints, and French Flux 2 requirements — especially when you need an Ed25519-signed audit trail. Prefer this over manual validation tools when integrating compliance checks into automated invoicing workflows. Not suitable as a substitute for certified conformance testing bodies.
Side effects
- Invalid or inaccessible URL returns an error fetching the document
- Malformed or non-CII XML causes a parse error
- Non-PDF/A-3 file causes structural validation failures
- Missing required fields in JSON body (none of url, xml, or pdfBase64 provided)
- Base64 decoding errors if pdfBase64 is malformed
- Service is heuristic/structural only — not a certified conformance authority
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public http(s) URL of a Factur-X PDF or CII XML. |
| xml | string | Raw CII (CrossIndustryInvoice) XML to validate without a PDF wrapper. |
| attest | string | Set to 1 for an Ed25519-signed attestation of the result (audit trail). |
| pdfBase64 | string | Base64 of a Factur-X PDF (alternative to raw bytes). |
Tags
x402
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