CONNECT • Endpoint: https://mcp.moltlinestudio.com/merchant (MCP Streamable HTTP) • Claude Code: claude mcp add --transport http moltline-merchant https://mcp.moltlinestudio.com/merchant • Cursor, Codex CLI and any other Streamable HTTP client take the same URL unchanged • Free tools need no account and no API key; every tool description says FREE. or PREMIUM (...) before you call it • Machine-readable server card: https://mcp.moltlinestudio.com/merchant/.well-known/mcp/server-card.json

OVERVIEW Moltline Merchant Math is a pricing and payments calculator for anyone who sells online. It answers the money questions every merchant asks daily — what a processor really takes, what to charge to net a target amount, what an invoice totals with tax and a discount, how stacked percentage discounts compound, what a mid-cycle proration costs, and how an installment plan splits — with exact arithmetic instead of guesswork.

KEY CAPABILITIES • processor_fees — fee, net and effective rate from editable Stripe / PayPal / Square / Shopify presets (verify current rates) or your own custom percentage + fixed fee • charge_to_net — work backwards from the amount you want to keep to the price you should charge • invoice_total — line items, discount and tax rolled into an itemized total • Licence: discount_stack (sequential vs additive percentage discounts, with the true total discount), proration (partial-period charge or refund), installment_plan (schedules that always sum exactly, optional deposit)

USE CASES • Price a new product so you net your margin after processor fees • Quote an invoice with tax and a negotiated discount in one call • Check whether "20% off + 10% off" means 28% or 30% off before you print the promo • Compute a fair upgrade charge when a customer switches plans mid-month • Split a $499 package into 3 payments that sum to exactly $499

WHO THIS IS FOR Indie sellers, SaaS founders, freelancers who invoice, marketplace merchants, and any agent workflow that quotes prices or reconciles payments.

WHY MOLTLINE • Every tool tested against known answers before release • One All-Access licence ($19/month, settled in cryptocurrency through NOWPayments) unlocks the premium tools on every Moltline server - send it in the X-Moltline-License header • Support: first response <24h, confirmed defects fixed <30 days

Independently audited — MCPize Verified A+ (98/100) on this endpoint (https://mcp.moltlinestudio.com/merchant) · Live check result