Payments and pricing math sellers do weekly, computed deterministically over MCP: processor_fees breaks down payment costs with editable presets, charge_to_net answers what to charge to net a target amount, invoice_total validates and totals line items, with discount_stack, proration, and installment_plan in the premium tier.
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charge_to_netCharge 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}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "net_target > 0 and pct_fee < 100 required"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| pct_fee | No | Processor percentage fee, below 100, e.g. 2.9 for 2.9%. Default 2.9. | |
| fixed_fee | No | Processor fixed fee per charge. Default 0.30. | |
| net_target | Yes | The amount you want to receive after fees; must be greater than 0. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
discount_stackDiscount 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, "sequential_total_discount_pct": 28.0, "additive_price": 140.0, "difference": 4.0, "note": "..."}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "price > 0 and at least one discount required"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| price | Yes | Original price before discounts; must be greater than 0. | |
| discounts_pct | Yes | Discount percentages in the order applied, at least one, e.g. [20, 10] for 20% then 10%. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
installment_planInstallment 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": [300.0, 300.0, 300.0], "check_sum": 1000.0}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "total > 0 and 1-36 installments"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| total | Yes | Full amount to split; must be greater than 0. | |
| deposit_pct | No | Optional upfront deposit as a percentage of total, e.g. 10 for 10%. Default 0. | |
| installments | Yes | Number of payments after the deposit; 1 to 36. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
invoice_totalInvoice 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}], "subtotal": 100.0, "discount": 10.0, "tax": 7.65, "total": 97.65}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "line_items must contain at least one item,"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| tax_pct | No | Tax percentage applied after the discount, e.g. 8.5. Default 0. | |
| line_items | Yes | At least one line item object {"desc": str, "qty": number, "unit_price": number}; the first 100 items are used. | |
| discount_pct | No | Discount percentage applied to the subtotal. Default 0. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
processor_feesProcessor 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": 1000, "fee": 32.0, "net": 968.0, "effective_rate_pct": 3.2, "note": "..."}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "amount must be > 0, transactions >= 1"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| amount | Yes | Total gross amount processed; must be greater than 0. | |
| processor | No | One of "stripe", "paypal", "square", "shopify", or "custom". Default "stripe". | stripe |
| custom_pct | No | Percentage fee used when processor is "custom", e.g. 2.5 for 2.5%. | |
| custom_fixed | No | Fixed per-transaction fee used when processor is "custom", e.g. 0.25. | |
| transactions | No | How many transactions the amount is spread across; at least 1. Default 1. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
prorationProrationCompute 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}. Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": ""} (for example {"error": "need amount > 0 and 0 <= days_used <= days_in_period"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
| Name | Required | Description | Default |
|---|---|---|---|
| days_used | Yes | Days of the period consumed; 0 to days_in_period. | |
| refund_mode | No | If true, "answer" is the refund amount instead of the charge. Default false. | |
| days_in_period | No | Length of the billing period in days; at least 1. Default 30. | |
| amount_per_period | Yes | Full-period price; must be greater than 0. |
| Name | Required | Description |
|---|---|---|
No output parameters | ||
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