Moltline Merchant Maths
Calculate processor fees, invoice totals, discounts, prorations and payment plans for your business.
Helps merchants and small business owners compute payment processor fees (Stripe, PayPal, Square, Shopify), invoice totals with tax and discounts, stacked discounts, prorated charges for partial billing periods, and installment payment schedules. Three tools are free; three require a license.
Try asking Muse: "How much will I net after Stripe fees if I charge $1000 across 10 transactions?"
Source: Found in the official MCP Registry (com.moltlinestudio/merchant) · First listed September 24, 2026
Last 24 hours
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Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://mcp.moltlinestudio.com/merchantNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1176ms. Worked in 97.6% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 6
processor_feesBreak down payment-processor fees: fee, net, and effective rate. FREE. Uses editable presets for stripe/paypal/square/shopify (verify current rates) or your own custom_pct + custom_fixed. Typical input {"amount": 1000, "processor": "stripe", "transactions": 10} returns {"gross": charge_to_netCompute the gross price to charge so you net a target after fees. FREE. 'Charge X to receive Y' after percentage + fixed processor fees. Typical input {"net_target": 100, "pct_fee": 2.9, "fixed_fee": 0.30} returns {"charge": 103.4, "fee": 3.4, "net": 100.0}. The inverse of procesinvoice_totalTotal an invoice: per-line totals, subtotal, discount, tax, grand total. FREE. Typical input {"line_items": [{"desc": "Design", "qty": 2, "unit_price": 50}], "tax_pct": 8.5, "discount_pct": 10} returns {"lines": [{"desc": "Design", "qty": 2, "unit_price": 50, "line_total": 100.0}discount_stackStack discounts correctly: sequential vs additive comparison. PREMIUM (license). The two methods differ — this shows both, the final price, and the true total discount. Typical input {"price": 200, "discounts_pct": [20, 10]} returns {"original": 200, "sequential_price": 144.0, "sprorationCompute a prorated charge or refund for a partial billing period. PREMIUM (license). Typical input {"amount_per_period": 90, "days_used": 10, "days_in_period": 30} returns {"days_used": 10, "days_in_period": 30, "prorated_charge": 30.0, "prorated_refund": 60.0, "answer": 30.0}. Uinstallment_planSplit a total into an installment schedule with optional deposit. PREMIUM (license). Rounding remainders land on the final payment so the schedule always sums exactly. Typical input {"total": 1000, "installments": 3, "deposit_pct": 10} returns {"deposit": 100.0, "payments": [300.Recent checks
Link
https://mcp.moltlinestudio.com/merchantQuestions about Moltline Merchant Maths in Muse
How do I connect Moltline Merchant Maths to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Moltline Merchant Maths to help me. It is a free service with an MCP server at https://mcp.moltlinestudio.com/merchant. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Moltline Merchant Maths working right now?
At the last check (September 28, 2026, 07:46 UTC) the endpoint was working, answering in 1176ms. Over the last 7 days it answered 97.6% of health checks. It is checked every 15 minutes.
Is Moltline Merchant Maths safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Moltline Merchant Maths do in Muse?
It exposes 6 tools, including processor_fees, charge_to_net, invoice_total, discount_stack. For example, you could ask Muse: "How much will I net after Stripe fees if I charge $1000 across 10 transactions?"
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