VerticalBooks
A headless double-entry accounting service for construction-software teams that models jobs, contracts, change orders, commitments, costs, progress billing, retainage, and payment applications as reviewable ledger primitives; exposes bounded developer and agent interfaces; and keeps accounting policy, form authorization, approval, posting, payment, audit, and correction under qualified human authority.
Construction-software builders can connect a generic ledger and still spend months defining job-cost dimensions, progress measures, change-order effects, retainage, payment applications, and reversals. VerticalBooks supplies a construction-oriented event and accounting model with balanced posting candidates, source provenance, policy versions, approval gates, idempotency, and readback. It does not promise universal percentage-of-completion treatment, legally sufficient lien-waiver handling, or authorized industry forms. Operational event, source document, accounting-policy interpretation, calculation candidate, accountant approval, journal posting, ledger readback, payment application, architect or owner certification, invoice, payment, audit conclusion, legal right, and correction remain distinct.
A developer or product team building construction operations, project controls, billing, or financial software that needs an embeddable ledger while retaining qualified construction-accounting ownership.
The current headless-ledger market creates a platform window, not a new accounting rule.
Construction-software product and developer teams are actionable, while segment, build-versus-buy threshold, and budget remain unvalidated.
Two cross-references with no inbound or direct connections provide limited corroboration.
Two cross-references, a concrete developer buyer, multiple verified generic headless ledgers, an unoccupied construction-specific product angle in the supplied scan, and reusable accounting primitives support the direction.
There are no inbound or direct connections, the referenced integration capability remains unverified, construction accounting varies by contract and policy, industry forms and lien rights carry external authority, implementation and support add marginal cost, incumbents can extend, and pricing is unvalidated.
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