Vellium & Co

Directory › Legal information › Stack Billing

Stack Billing

Generate a finished, professional invoice PDF from JSON — recipient and line items in, a ready-to-send application/pdf out. Layouts: standard, legal, creative. Totals and tax are computed server-side so the numbers always add up. First paym

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Our latest check (2026-10-11)

Answering
Yes — valid x402 payment terms
Time to answer
178 ms
Price
$0.100 per call
Paying buyers, last 30 days
1 (directory's own records)
Paid calls, last 30 days
2
Category
Legal information
Address
https://stackbill.app/routes/x402/invoice-from-data

Accuracy: paid answers checked against an independent record

Not yet in our paid checks. A seller we have not checked has neither passed nor failed.

For agents

This page as JSON: /sellers/2871a1240ef0.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).

Sellers can see the evidence behind their checks and ask for a re-check at [email protected].