Seller Fees Calculator
NPM · SELLER-FEES-MCP
Gumroad, Stripe, PayPal and Etsy seller fees, payouts and break-even prices. Local, no API key.
Available components
Last scanned (23 hours ago)
Scores higher than 31% of npm servers
Category Finance and Payments
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security81
- No malware found by supply-chain analysis.Pass
- CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available. View diagnostics → Fail
- No install/post-install scripts declared.Pass
- 30 of 93 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 6 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability58
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 910 tokens (~182/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage98
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 93% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Unverified: 1 category
A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 28 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 27 Oct 26 47
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Analysed npm/seller-fees-mcp@1.0.1
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Vulnerabilities 1 finding
| ID | CVE | Severity | Vector | Fix available |
|---|---|---|---|---|
| GHSA-mrhx-c7xc-m3w5 | CVE-2023-54404 | high | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | yes |
Background: What a vulnerability scan can and cannot prove →
Dependencies 93 packages
| Packages resolved | 93 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
compare Compare platforms ~51
Fee and net for one price across Gumroad direct, Gumroad Discover, Stripe, PayPal (checkout, card, goods) and Etsy, best net first.
| Name | Type | Req | Description |
|---|---|---|---|
| amount | number | yes | Sale price in USD |
No output schema declared.
No examples provided.
fee Seller fee for one sale ~284
Fee and net amount for one sale on Gumroad, Stripe, PayPal or Etsy (US sellers, USD). Gumroad direct sales include the 2.9% + $0.30 card processing by default.
| Name | Type | Req | Description |
|---|---|---|---|
| amount | number | yes | Sale price in USD (Etsy: item price) |
| discover | boolean | – | Gumroad: sale came through Gumroad Discover (flat 30%, processing included) |
| extra_pct | number | – | Stripe: extra % for international cards or currency conversion |
| gift_wrap | number | – | Etsy: gift wrap charged |
| high_volume | boolean | – | Gumroad: 5% + $0.50 tier (paid sales this calendar month reached $20,000) |
| international | boolean | – | PayPal: international buyer (+1.50%) |
| offsite_ads | string | – | Etsy: Offsite Ads fee (std 15%, low 12%) |
| platform | string | yes | – |
| processing | string | – | Gumroad direct: add card processing 2.9% + $0.30 (default card) |
| qty | integer | – | Etsy: items in the order |
| sales_tax_pct | number | – | Etsy: sales tax % on the order |
| shipping | number | – | Etsy: shipping charged to the buyer |
| type | string | – | PayPal payment type (default checkout) |
No output schema declared.
No examples provided.
payout Payout after fees ~268
What you keep per sale and in total for a number of units, after platform and processing fees.
| Name | Type | Req | Description |
|---|---|---|---|
| amount | number | yes | Sale price in USD |
| discover | boolean | – | Gumroad: sale came through Gumroad Discover (flat 30%, processing included) |
| extra_pct | number | – | Stripe: extra % for international cards or currency conversion |
| gift_wrap | number | – | Etsy: gift wrap charged |
| high_volume | boolean | – | Gumroad: 5% + $0.50 tier (paid sales this calendar month reached $20,000) |
| international | boolean | – | PayPal: international buyer (+1.50%) |
| offsite_ads | string | – | Etsy: Offsite Ads fee (std 15%, low 12%) |
| platform | string | yes | – |
| processing | string | – | Gumroad direct: add card processing 2.9% + $0.30 (default card) |
| qty | integer | – | Etsy: items in the order |
| sales_tax_pct | number | – | Etsy: sales tax % on the order |
| shipping | number | – | Etsy: shipping charged to the buyer |
| type | string | – | PayPal payment type (default checkout) |
| units | integer | – | Number of sales (default 1) |
No output schema declared.
No examples provided.
platforms Rates and sources ~19
Default rates, options and official source pages for each platform.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
price_for_target Price for a target payout ~288
Lowest price (rounded up to the cent) that leaves at least the target amount after fees.
| Name | Type | Req | Description |
|---|---|---|---|
| cost_per_item | number | – | Etsy: your cost per item |
| discover | boolean | – | Gumroad: sale came through Gumroad Discover (flat 30%, processing included) |
| extra_pct | number | – | Stripe: extra % for international cards or currency conversion |
| gift_wrap | number | – | Etsy: gift wrap charged |
| high_volume | boolean | – | Gumroad: 5% + $0.50 tier (paid sales this calendar month reached $20,000) |
| international | boolean | – | PayPal: international buyer (+1.50%) |
| label_cost | number | – | Etsy: shipping label cost |
| offsite_ads | string | – | Etsy: Offsite Ads fee (std 15%, low 12%) |
| platform | string | yes | – |
| processing | string | – | Gumroad direct: add card processing 2.9% + $0.30 (default card) |
| qty | integer | – | Etsy: items in the order |
| sales_tax_pct | number | – | Etsy: sales tax % on the order |
| shipping | number | – | Etsy: shipping charged to the buyer |
| target | number | yes | Amount you want to keep per sale, USD |
| type | string | – | PayPal payment type (default checkout) |
No output schema declared.
No examples provided.
How do I install the Seller Fees Calculator MCP server?
Seller Fees Calculator runs locally as an npm package, launched with npx -y seller-fees-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · seller-fees-mcp
claude mcp add narwhalthepong-seller-fees-mcp -- npx -y seller-fees-mcp
What is the Seller Fees Calculator MCP server?
Seller Fees Calculator is an MCP server listed in the public MCP registry as io.github.NarwhalThePong/seller-fees-mcp. Gumroad, Stripe, PayPal and Etsy seller fees, payouts and break-even prices. Local, no API key. This page covers its npm package (seller-fees-mcp).
Is the Seller Fees Calculator MCP server safe to use?
Seller Fees Calculator scores 62 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 4 November 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Seller Fees Calculator MCP server expose?
Seller Fees Calculator exposes 5 tools: fee, payout, price_for_target, compare, platforms. Their descriptions and schemas cost roughly 910 tokens of context every time the server is loaded.
Is the Seller Fees Calculator MCP server still maintained?
Seller Fees Calculator is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the Seller Fees Calculator MCP server under?
Seller Fees Calculator declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.