Speedy customer onboarding for billing, tax & bank details (fast, validated)

Many SMBs, marketplaces and payment platforms still lose days to weeks onboarding customers because billing, tax and bank details are collected manually or validated piecemeal, causing high drop-off, payout failures and compliance exposure. This problem is particularly acute across 25 million SMBs where incorrect VAT numbers, mismatched bank account details and poor document capture translate directly into chargebacks, delayed revenue and operational cost. You could build a modular, API-first onboarding service that combines open-finance bank account verification and routing checks with AI-driven OCR/LLM extraction and automated VAT/tax number validation, returning standardized, confidence-scored payloads in sub-second to minute latencies. Package it as SaaS with a target $720 ACV per SMB (aligned to the $18.0B TAM), supplemented by per-verification fees and enterprise connectors for marketplaces, PSPs and accounting platforms. The market is attractive now because API banking and open finance make reliable, account-level verification feasible, LLM/OCR improvements materially raise extraction accuracy on messy documents, and accelerating cross-border e-commerce raises demand for validated, multi-jurisdiction tax and payout tooling. To stand out, prioritize end-to-end accuracy (aiming for >98% validated capture), low-latency enriched outputs, pre-built integrations with major PSPs and compliance coverage for priority jurisdictions, but be realistic about the work: local tax complexity, KYC/PII legal constraints and broad integration surface are real execution risks that demand engineering discipline, legal investment and partnership distribution to compete effectively in a medium-competition space.