Start free, then choose the monthly API capacity that fits your product. Every paid plan includes XRechnung and ZUGFeRD generation, validation, and automatic compliance updates.
500 free trial invoices (30-day expiry) — no credit card required.
Maintaining e-invoicing compliance in-house means tracking KoSIT validator updates, EN 16931 rule changes, and multiple format specifications. InvoiceSpec handles that maintenance for you.
Get an API key instantly and generate your first compliant invoice in under a minute.
For small applications and initial production use.
Billed monthly · cancel anytime
€0.030 per invoice · 1 operation = 1 invoice
What's included
For growing teams that need more invoice volume and advanced integrations.
Billed monthly · cancel anytime
€0.016 per invoice · 1 operation = 1 invoice
What's included
For growing products and higher-volume integrations.
Billed monthly · cancel anytime
€0.007 per invoice · 1 operation = 1 invoice
What's included
For high-volume integrations and contractual requirements.
Custom pricing
Tailored capacity and commercial terms for high-volume workloads.
Enterprise includes
Every API call is one operation — whether you generate or validate an XRechnung or ZUGFeRD invoice. Your plan's monthly price buys a bundle of operations at a volume discount; the per-invoice effective rate decreases as you move up tiers, as shown on each plan card above.
1 operation per call
1 operation per call
1 operation per call
1 operation per call
The effective per-operation cost depends on your plan: Starter €0.030, Plus €0.016, Pro €0.007. See the per-invoice price on each plan card above.
30-day expiry — no credit card required. Generate and validate XRechnung and ZUGFeRD invoices against the real API. Pick a plan when you're ready.
API key in seconds — first compliant invoice in under a minute.