Open-source B2B and marketplace ecommerce; new stores include an MCP server for AI agents.
RevClamp MCP Server
Overview
Description from the maker (original English)
Zero-take-rate Stripe 2025-03-31.basil, Visa CE 3.0 & EU/XI VIES VAT guardrails MCP server.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Computer or cloud
- Transport: stdio, Streamable HTTP
- Category: Online shops & payments
- You need to fill in: REVCLAMP_API_KEY
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 3 of 3 passed
- Runs on the maker’s server: what you ask it goes through their server.
- Can do 9 things (tools) revclamp_audit_revenue_leakage, revclamp_evaluate_ghost_usage, revclamp_stage_stripe_dispute_ce3, revclamp_validate_eu_vat_vies …
- You fill in yourself:
REVCLAMP_API_KEY,REVCLAMP_MCP_URL
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- Runs in the cloudNothing to install; it connects over the internet
- npmNode.js installed (for the npx command)
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://revclamp.com/api/mcpOr run it on your computer
Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json
{
"mcpServers": {
"revclamp": {
"command": "npx",
"args": [
"-y",
"revclamp-mcp"
],
"env": {
"REVCLAMP_API_KEY": "your-value",
"REVCLAMP_MCP_URL": "your-value"
}
}
}
}Run this in your terminal
claude mcp add --transport http revclamp https://revclamp.com/api/mcpOr run it on your computer
claude mcp add revclamp --env REVCLAMP_API_KEY=your-value --env REVCLAMP_MCP_URL=your-value -- npx -y revclamp-mcpFill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"revclamp": {
"url": "https://revclamp.com/api/mcp"
}
}
}Or run it on your computer
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"revclamp": {
"command": "npx",
"args": [
"-y",
"revclamp-mcp"
],
"env": {
"REVCLAMP_API_KEY": "your-value",
"REVCLAMP_MCP_URL": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"revclamp": {
"type": "http",
"url": "https://revclamp.com/api/mcp"
}
}
}Or run it on your computer
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"revclamp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"revclamp-mcp"
],
"env": {
"REVCLAMP_API_KEY": "your-value",
"REVCLAMP_MCP_URL": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://revclamp.com/api/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
- Optional RevClamp workspace key (rg_live_...). Omit to run all 9 tools 100% locally in-process via local_engine.mjs.
REVCLAMP_MCP_URLenvOptional Streamable HTTP MCP endpoint override (defaults to https://api.revclamp.com/api/mcp).
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.
revclamp_audit_revenue_leakageRun a deterministic 90-day B2B revenue leakage and chargeback readiness audit across Stripe subscriptions, AI/API usage telemetry events, and open disputes. Executes as a 100% read-only, stateless diagnostic with zero external Stripe mutations. Returns structuredContent containin
revclamp_evaluate_ghost_usageEvaluate whether a specific customer's AI or API usage event constitutes unpaid ghost usage across multi-subscription Stripe 2025-03-31.basil state, enforcing fail-closed pagination (has_more must be explicitly false) and configurable 0-14 day dunning grace windows. Executes as a
revclamp_stage_stripe_dispute_ce3Evaluate Visa Compelling Evidence 3.0 (CE 3.0) qualification across 120-to-365-day historical charges (requiring at least 2 settled, non-refunded, non-disputed prior transactions sharing IP address, device fingerprint, or billing email) and assemble a non-destructive Stripe dispu
revclamp_validate_eu_vat_viesNormalize EU-27 and Northern Ireland (XI) B2B VAT identifiers (including mandatory Greece ISO-3166 GR to EL prefix normalization) and evaluate cross-border 0% VAT reverse-charge eligibility, VIES consultation evidence, or MS_UNAVAILABLE circuit-breaker fulfillment hold actions. R
revclamp_reconcile_b2b_net_termsReconcile B2B wholesale Net-15, Net-30, and Net-60 invoice deposits, partial payments, and credit notes using exact integer minor-unit (EUR/USD cent) arithmetic with zero IEEE-754 floating-point drift. Executes as a pure, stateless, read-only financial reconciliation function. Re
revclamp_verify_webhook_signatureGenerate and verify canonical Stripe-Signature (t= ,v1= ), X-Shopify-Hmac-Sha256 ( ), and X-RevClamp-Signature (t= ,v1= ) headers over exact UTF-8 webhook payload bytes using crypto.timingSafeEqual and a 300-second replay window guard. Enforces a Zero-Trust guard that blocks know
revclamp_calculate_roi_and_plan_fitDeterministically calculate monthly and annual B2B margin savings using exact integer USD cents when replacing a 25%-30% contingency chargeback agency with RevClamp flat-rate 0% commission plans ($19 Starter, $59 Growth, $199 Scale). Evaluates monthlyWonDisputeUsd, monthlyGhostBl
revclamp_simulate_webhook_replayDeterministically evaluate an ordered or out-of-order sequence of 1-10 Stripe/Shopify/RevClamp subscription lifecycle webhooks against a 72-hour idempotency deduplication Set (eventId), a configurable idempotencyWindowSec (60s-2592000s, default: 259200s / 72h), and a monotonic tr
revclamp_lint_dispute_evidenceDeterministically lint a Stripe dispute evidence[access_activity_log] payload against Stripe's 18,000 UTF-16 code unit (String.prototype.length) ceiling, UTF-8 byte length, non-destructive --- BEGIN REVCLAMP CE3 EVIDENCE --- / --- END REVCLAMP CE3 EVIDENCE --- (or [RevClamp Verif
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain revclamp.com (the registry checks domain ownership)
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- ✓ Pass
Endpoint responds
Responded in 188 ms (HTTP 200)
- – Not applicable
Sign-in with OAuth
No sign-in needed
- ✓ Pass
No hidden instructions in tool descriptions
Read 9 tool descriptions and found no hidden instructions to the AI
Compared with others in Online shops & paymentsi
- More stars than 0% of the other 1749 servers in this category
- Published to the registry more recently than 92% of the other 1749 servers in this category
- Basic checks equal to or better than 100% of the other 1749 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is RevClamp MCP Server safe?
It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
You need to fill in: REVCLAMP_API_KEY
Does it run on my computer or in the cloud?
Either way works: install it on your computer or connect to the cloud version.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.20.21) reached the registry today.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spree Commerce: open-source B2B and marketplace ecommerce, Stripe MCP, MCP Cn Commerce
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Stripe MCP
Stripe’s official server lets AI view and manage customers, products, payments and invoices. Connect to Stripe’s cloud and sign in with OAuth.
MCP Cn Commerce
8 read-only MCP platform entries; support is operation-specific; merchant live acceptance pending
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
RevClamp MCP Server & CLI (revclamp-mcp)
`revclamp-mcp` is a standalone, zero-dependency Open-Source Model Context Protocol (MCP) Server & CLI (index.mjs + local_engine.mjs) implementing 9 deterministic B2B FinOps, Stripe `2025-03-31.basil`, Visa CE 3.0, EU/XI VIES VAT, Shopify Plus B2B Net-15/30/60, and Webhook Security tools in pure Node.js.
- 100% Local In-Process Execution (Default — Zero Network / Zero API Key Required): All 9 MCP tools (
initialize,tools/list, andtools/call) execute locally in-process insidelocal_engine.mjsusing pure Node.js (node:cryptoHMAC-SHA256 verification, integer-cent double-entry accounting, 72-hour webhook replay state machines, and18,000UTF-16 code unit CE 3.0 linting). Zero network calls are ever made unlessREVCLAMP_API_KEYorREVCLAMP_MCP_URLis explicitly configured. - Optional Hosted Cloud Workspace Sync (`REVCLAMP_API_KEY`): When
REVCLAMP_API_KEY(rg_live_...) is configured,revclamp-mcpconnects to RevClamp Enterprise (https://api.revclamp.com/api/mcp) to unlock the 90-day durable transactional usage & audit ledger, 24/7 autonomous Stripe dispute & entitlement webhook outbox, and real-time EU Commission VIES SOAP gateway consultation numbers.
Local Open-Core (local_engine.mjs) vs. Hosted Cloud (REVCLAMP_API_KEY)
| Capability | Local Open-Core Default (Zero API Key) | Hosted Cloud (REVCLAMP_API_KEY) |
|---|---|---|
| Execution & Network | 100% in-process (local_engine.mjs), zero network calls | HTTPS JSON-RPC to https://api.revclamp.com/api/mcp (redirect: "error") |
| Usage & Audit Storage | Stateless evaluation of caller-supplied JSON snapshots | Persistent 90-day durable transactional ledger + Stripe historical backfill |
| Dispute & Entitlement Action | Returns non-destructive submit: false draft & revoke_entitlement decision | 24/7 autonomous Stripe webhook outbox (disputes.update & signed revoke webhooks) |
| EU & `XI` B2B VAT (`VIES`) | Deterministic syntax & GR -> EL normalization (FORMAT_ONLY default, valid: null) | Live EU Commission VIES SOAP consultation IDs + circuit-breaker retry queue (viesMode: "LIVE" + REVCLAMP_API_KEY) |
| Monthly Event Tiers | Unlimited local in-process evaluations (0 network cost) | Free Sandbox (5,000 events/mo) · Starter $19/mo (100k) · Growth $59/mo (1M) · Scale $199/mo (5M) |
| Data Minimization & Privacy | Nothing ever leaves your machine | Only explicit tools/call arguments are sent over TLS after local live-secret scrubbing (blocks sk_live_, non-test whsec_, and shpat_ locally before any network request) |
Open-Source MCP Tools Implemented in local_engine.mjs (9)
| Tool Name | Domain | Local In-Process Implementation (local_engine.mjs) | Execution Mode |
|---|---|---|---|
revclamp_audit_revenue_leakage | Stripe Billing & Usage | Evaluates caller-supplied customer/usage arrays (demo: true for synthetic sample) and returns upgrade hooks when no workspace ledger is connected | Local In-Process (or Optional Cloud Key) |
revclamp_evaluate_ghost_usage | Stripe 2025-03-31.basil | Evaluates multi-subscription customer snapshots (has_more: false enforced) and 0–14d dunning grace windows for unpaid API/LLM bleed | Local In-Process (or Optional Cloud Key) |
revclamp_stage_stripe_dispute_ce3 | Visa 10.4 / CE 3.0 | Evaluates 120d–365d prior undisputed charges (ip_subnet/device_id overlap) against caller-supplied usageEvents (demo: true for sample) and stages a non-destructive submit: false draft (<= 18,000 UTF-16 code units) | Local In-Process (or Optional Cloud Key) |
revclamp_validate_eu_vat_vies | EU & XI B2B VAT | Normalizes 27 EU member states + Northern Ireland (XI) VAT IDs (GR -> EL), checks syntax locally (FORMAT_ONLY, valid: null), simulates errorWrappers (demo: true), or queries live EU VIES (viesMode: "LIVE" + REVCLAMP_API_KEY) | Local In-Process (or Optional Live VIES) |
revclamp_reconcile_b2b_net_terms | B2B Wholesale Net-30 | Reconciles Net-15/30/60 upfront deposits and credit notes using integer EUR-cent double-entry accounting | Local In-Process (or Optional Cloud Key) |
revclamp_verify_webhook_signature | Webhook HMAC-SHA256 | Generates and verifies Stripe-Signature, X-Shopify-Hmac-Sha256, and X-RevClamp-Signature over raw UTF-8 bytes (node:crypto) with 300s replay checks | Local In-Process (or Optional Cloud Key) |
revclamp_calculate_roi_and_plan_fit | 0% Take-Rate ROI & Plan Fit | Calculates monthly and annual B2B margin savings in integer USD cents vs. 25%–30% chargeback agencies and recommends the optimal tier | Local In-Process (or Optional Cloud Key) |
revclamp_simulate_webhook_replay | Webhook Replay & FSM | Simulates subscription lifecycle webhooks against a 72h deduplication Set and monotonic createdSec guard vs. naive arrival-order handlers | Local In-Process (or Optional Cloud Key) |
revclamp_lint_dispute_evidence | Dispute Evidence UTF-16 & CE 3.0 | Lints evidence[access_activity_log] payloads against the 18,000 UTF-16 code unit ceiling, non-destructive CE 3.0 markers, and merchant note preservation | Local In-Process (or Optional Cloud Key) |
Quick Start (Claude Desktop / Cursor / Windsurf)
Add revclamp-mcp to your claude_desktop_config.json or .cursor/mcp.json. By default, revclamp-mcp runs 100% locally in-process with zero network calls and zero API keys required:
{
"mcpServers": { "revclamp": { "command": "npx", "args": ["-y", "github:lhphong09t2/revclamp-mcp"] } } }
*(Optional)* To connect to a live workspace on https://revclamp.com/dashboard, pass REVCLAMP_API_KEY in env or use the hosted Streamable HTTP endpoint (POST https://api.revclamp.com/api/mcp):
curl -sS -X POST https://api.revclamp.com/api/mcp \
-H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'
CLI Usage & <60s Local Smoke Check (--self-test)
# Run a <60s local CLI smoke check (verifies all 9 tool schemas & executes a local_engine.mjs sample audit with zero API key)
npx -y github:lhphong09t2/revclamp-mcp#v1.20.20 --self-test
Provision a free Cloud Workspace instantly (zero email required; saves to ~/.revclamp/credentials.json) or bind a work email via 6-digit OTP
npx -y revclamp-mcp@1.20.20 --init-workspace npx -y revclamp-mcp@1.20.20 --init-workspace you@company.com
Verify the 6-digit OTP using REVCLAMP_API_KEY from environment
REVCLAMP_API_KEY="rg_live_..." npx -y revclamp-mcp@1.20.20 --verify-otp you@company.com 123456
List all 9 MCP tools and JSON schemas (runs locally in-process)
node index.mjs --list-tools
Validate an EU or Northern Ireland (XI) B2B VAT ID (auto-converts Greece GR -> EL)
node index.mjs --check-vat GR123456789 DE
Calculate 0% take-rate ROI and optimal flat-rate plan fit (runs locally in-process)
node index.mjs --calc-roi 10000 600 25 250000
Simulate out-of-order webhook replay and 72-hour deduplication state machine (runs locally)
node index.mjs --sim-replay out_of_order_stale_update_after_cancel
Lint Stripe dispute evidence UTF-16 code units and non-destructive CE 3.0 markers (runs locally)
node index.mjs --lint-evidence valid_ce3_non_destructive
Verify webhook HMAC-SHA256 using REVCLAMP_WEBHOOK_SECRET from environment (runs locally)
REVCLAMP_WEBHOOK_SECRET="whsec_test_secret_revclamp_sandbox_2026" node index.mjs --verify-webhook stripe
Invoke Visa CE 3.0 readiness staging locally (pass demo: true for synthetic sample or usageEvents for real logs)
node index.mjs --call revclamp_stage_stripe_dispute_ce3 '{"disputeId":"du_1Qxyz01","customerId":"cus_ent_88","disputeReason":"fraudulent","demo":true}'
Architecture & Engineering Deep-Dives (7 Post-Mortems & 8 Interactive Browser Tools)
1. Stripe 2025-03-31.basil Entitlement Guard & Visa CE 3.0 Two-Tier Routing
- Engineering Post-Mortem #1: Stripe's
basilAPI broke my grace-period logic, and CE 3.0 turned out to be a routing problem - Engineering Post-Mortem #7: Visa CE 3.0
18,000UTF-16 Code Unit Evidence Truncation & Non-Destructive Staging - Interactive Tools (No Signup):
- Free Stripe
2025-03-31.basilGhost-Usage Auditor - Free Visa CE 3.0 Readiness Checker
- Free 18,000 UTF-16 Stripe Dispute Evidence Linter
2. EU VIES HTTP 200 OK Soft-Failure Circuit Breaker & B2B Net-Terms Reconciliation
- Engineering Post-Mortem #2: VIES returns
HTTP 200when it's down, and I charged the wrong VAT because of it - Engineering Post-Mortem #3: Shopify Plus B2B Net-15/30/60 Integer-Cent Deposit & Credit-Note Reconciliation
- Interactive Tools (No Signup):
- Free 20-ID EU &
XIVIES VAT Batch Validator - Free Shopify Plus B2B Net-Terms Deposit & Credit-Note Calculator
3. Webhook HMAC-SHA256 Raw-Body Security, 72h Replay FSM & 0% Take-Rate ROI
- Engineering Post-Mortem #4: Why Stripe and Shopify Webhook HMAC-SHA256 Verification Fails on Parsed JSON Bodies
- Engineering Post-Mortem #5: Chargeback Contingency Fees (25%–30%) vs. Flat-Rate 0% Commission Automation
- Engineering Post-Mortem #6: Webhook Idempotency & Out-of-Order Subscription State Machines
- Interactive Tools (No Signup):
- Free Stripe, Shopify & RevClamp Webhook HMAC-SHA256 Signature Tester
- Free B2B Chargeback ROI & Take-Rate Calculator
- Free 72h Webhook Replay & Out-of-Order State Machine Simulator
Security & Resource Bounds
- Local-First Deterministic Execution: Runs all 9 tools locally in-process inside
local_engine.mjswith zero external npm dependencies. - Strict Origin Pinning (Cloud Mode): When
REVCLAMP_API_KEYis provided, only connects tohttps://api.revclamp.com/api/mcporhttps://revclamp.com/api/mcpover TLS (redirect: "error"). - Bounded Execution: Enforces a hard
10,000msrequest timeout (AbortSignal.timeout) and a32,768-byte request/response payload cap. - Full LLM Reference:
https://revclamp.com/llms-full.txt
License
MIT © RevClamp Enterprise