Lemonsqueezy MCP Server

@yawlabs/lemonsqueezy-mcp

One click adds this to your local Yaw MCP config so it's available in every Yaw Terminal session. Or install manually below.

MCP server for the LemonSqueezy API. Manage your store, products, customers, subscriptions, discounts, license keys, and more from any MCP-compatible AI assistant.

Quick start

npx -y @yawlabs/lemonsqueezy-mcp@latest

Requires Node.js 22 or later (engines.node is >=22).

Or one-click install via Smithery:

npx -y @smithery/cli install @yawlabs/lemonsqueezy-mcp --client claude

Smithery prompts for your env vars (API key, optional guardrails) and writes the config into your client for you.

What it looks like

Once configured, you can ask your AI assistant store-management questions in plain English and it routes them through the MCP tools:

You:  How much did we make from the "Pro Annual" plan last month?
Claude: [calls ls_list_subscriptions, ls_get_variant, ls_list_subscription_invoices]
        Pro Annual brought in $14,280 across 84 active subscriptions in April.
        Three of those were upgrades from monthly; none churned.

You:  Refund order #LS-1234 in full.
Claude: [calls ls_get_order to fetch the total, then ls_refund_order with amount = total]
        Refunded $99.00 against order LS-1234. The customer's card will see the
        credit in 5-10 business days.

You:  Disable license key abc-123 for the customer who reported abuse.
Claude: [calls ls_list_license_keys to find the ID, then ls_update_license_key with disabled: true]
        License key disabled. Their existing activations will fail validation
        on the next check.

Guardrails (refund cap, rate limit, store allowlist) catch the obvious mistakes before they reach LemonSqueezy. See Configuration for the env vars that turn them on.

Setup

Set your LemonSqueezy API key as an environment variable:

export LEMONSQUEEZY_API_KEY="your-api-key"

Get your API key from your LemonSqueezy dashboard.

Docker

A multi-stage Dockerfile is included at the repo root. The runtime image is a single bundled file on node:22-alpine running as the non-root node user, with no port exposed (stdio transport).

docker build -t yawlabs/lemonsqueezy-mcp .
docker run --rm -i -e LEMONSQUEEZY_API_KEY="your-api-key" yawlabs/lemonsqueezy-mcp

A matching Containerfile is provided for Podman users. It is generated from Dockerfile via npm run gen:containerfile. release.sh runs npm run check:containerfile in step 1, so a release fails if the two have drifted. This repo has no CI, so nothing checks a pull request for drift: run it yourself after editing Dockerfile.

Claude Code

Add to your MCP config:

{
  "mcpServers": {
    "lemonsqueezy": {
      "command": "npx",
      "args": ["-y", "@yawlabs/lemonsqueezy-mcp@latest"],
      "env": {
        "LEMONSQUEEZY_API_KEY": "your-api-key"
      }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "lemonsqueezy": {
      "command": "npx",
      "args": ["-y", "@yawlabs/lemonsqueezy-mcp@latest"],
      "env": {
        "LEMONSQUEEZY_API_KEY": "your-api-key"
      }
    }
  }
}

Tools (64)

Users

• ls_get_user — Get the authenticated user

Stores

• ls_get_store — Get a store by ID
• ls_list_stores — List all stores (not gated by LEMONSQUEEZY_ALLOWED_STORE_IDS: returns every store the API key can see)

Customers

• ls_get_customer — Get a customer by ID
• ls_list_customers — List customers (filter by store, email)
• ls_create_customer — Create a customer
• ls_update_customer — Update a customer
• ls_archive_customer — Archive a customer

Products

• ls_get_product — Get a product by ID
• ls_list_products — List products (filter by store)

Variants

• ls_get_variant — Get a variant by ID
• ls_list_variants — List variants (filter by product)

Prices

• ls_get_price — Get a price by ID
• ls_list_prices — List prices (filter by variant)

Both annotate every price record with effective_unit_price, the cents actually charged per unit, and effective_unit_price_note, which says where that number came from; unit_price_is_not_charged or unit_price_is_per_package is added where it applies. Read effective_unit_price rather than unit_price, which is vestigial on tiered (volume / graduated) pricing, or a variant's price. The subscription-item reads apply the same annotation to prices embedded via include=price.

Files

• ls_get_file — Get a file by ID
• ls_list_files — List files (filter by variant)

Orders

• ls_get_order — Get an order by ID
• ls_list_orders — List orders (filter by store, email)
• ls_generate_order_invoice — Generate a PDF invoice
• ls_refund_order — Issue a refund

Order Items

• ls_get_order_item — Get an order item by ID
• ls_list_order_items — List order items (filter by order, product, variant)

Subscriptions

• ls_get_subscription — Get a subscription by ID
• ls_list_subscriptions — List subscriptions (filter by store, status, product, etc.)
• ls_update_subscription — Update (plan switch, pause, billing anchor, trial)
• ls_cancel_subscription — Cancel a subscription

Subscription Invoices

• ls_get_subscription_invoice — Get a subscription invoice by ID
• ls_list_subscription_invoices — List subscription invoices (filter by store, subscription, status)
• ls_generate_subscription_invoice — Generate a PDF invoice
• ls_refund_subscription_invoice — Issue a refund

Subscription Items

• ls_get_subscription_item — Get a subscription item by ID
• ls_list_subscription_items — List subscription items (filter by subscription, price)
• ls_update_subscription_item — Update quantity
• ls_get_subscription_item_usage — Get current billing period usage

Usage Records

• ls_get_usage_record — Get a usage record by ID
• ls_list_usage_records — List usage records (filter by subscription item)
• ls_create_usage_record — Report metered usage (increment or set)

Discounts

• ls_get_discount — Get a discount by ID
• ls_list_discounts — List discounts (filter by store)
• ls_create_discount — Create a discount code
• ls_delete_discount — Delete a discount

Discount Redemptions

• ls_get_discount_redemption — Get a discount redemption by ID
• ls_list_discount_redemptions — List redemptions (filter by discount, order)

License Keys

• ls_get_license_key — Get a license key by ID
• ls_list_license_keys — List license keys (filter by store, order, product)
• ls_update_license_key — Update activation limit, expiry, or disabled status

License Key Instances

• ls_get_license_key_instance — Get a license key activation by ID
• ls_list_license_key_instances — List activations (filter by license key)

Checkouts

• ls_get_checkout — Get a checkout by ID
• ls_list_checkouts — List checkouts (filter by store, variant)
• ls_create_checkout — Create a checkout URL (custom pricing, prefill, discounts)

Webhooks

• ls_get_webhook — Get a webhook by ID
• ls_list_webhooks — List webhooks (filter by store)
• ls_create_webhook — Create a webhook
• ls_update_webhook — Update a webhook
• ls_delete_webhook — Delete a webhook

License API

• ls_activate_license — Activate a license key (no API key required)
• ls_validate_license — Validate a license key (no API key required)
• ls_deactivate_license — Deactivate a license key instance (no API key required). Destructive on every call: rate-limited and audited, with the license key masked in the audit entry

Affiliates

• ls_get_affiliate — Get an affiliate by ID (commission rate, status, earnings)
• ls_list_affiliates — List affiliates (filter by user email). Not gated by LEMONSQUEEZY_ALLOWED_STORE_IDS: returns affiliates from every store the API key can see

Webhook sink (optional)

Bridge to a separate @yawlabs/lemonsqueezy-webhook-sink process so the agent can reconcile against webhooks that actually fired. Tools are always registered; if LEMONSQUEEZY_SINK_URL / LEMONSQUEEZY_SINK_ADMIN_TOKEN are unset, calls return a clear "not configured" error.

• ls_sink_events_list — List webhook events the sink has received (filter by since / type / limit)
• ls_sink_event_mark_processed — Mark a sink event as processed by your consumer (idempotent)
• ls_sink_stats — Get total events, unprocessed count, and last-received timestamp

Features

• API coverage — 58 tools across 20 LemonSqueezy API resources, 3 License API tools, and 3 bridge tools to an optional @yawlabs/lemonsqueezy-webhook-sink for webhook reconciliation (64 in total)
• JSON:API support — Pagination on every ls_list_* tool, filters on every one but ls_list_stores, and relationship inclusion (include) on every ls_get_* / ls_list_* tool except ls_get_user and ls_get_subscription_item_usage
• Zero runtime dependencies — Single bundled file for instant npx startup
• License API — Activate, validate, and deactivate license keys without an API key
• MCP annotations — Every tool declares read-only, destructive, and idempotent hints
• Retry with backoff — for LemonSqueezy API calls (the ls_sink_* tools make a single attempt): a 429 is retried for every method, including POSTs such as refunds and License API calls, after waiting for the server's Retry-After (1s if it is missing or unparseable). This relies on a 429 meaning the request was rejected before LemonSqueezy acted on it. If Retry-After is over 30s, or the wait would pass the overall deadline, the 429 is returned instead. 5xx responses, timeouts and network errors are retried only for idempotent methods (GET, DELETE), with exponential backoff and jitter; a POST or PATCH that hits one is not retried. Up to 4 attempts, 30s per attempt, and no new attempt or wait is started after 90s
• Guardrails — opt-in store allowlist, refund cap, destructive-call rate limit, authority-class disable (LEMONSQUEEZY_DISABLE_CLASSES), and per-authority-class rate limits (LEMONSQUEEZY_RATE_LIMIT_PER_CLASS)
• Audit log MCP Resource — lemonsqueezy://audit-log exposes the last 1000 destructive-call entries as application/x-ndjson for clients without stderr access
• Structured logging — opt-in JSON logs to stderr with selectable levels (error, audit, all)

Configuration

All configuration is via environment variables. The management-API tools need one of LEMONSQUEEZY_API_KEY_COMMAND, LEMONSQUEEZY_TEST_API_KEY or LEMONSQUEEZY_API_KEY (checked in that order); the three License API tools and the ls_sink_* tools need none of them. Everything else is opt-in.

Logging format

Each line: {ts, event, tool?, method?, path?, status, latency_ms, request_id?, error?, audit?, inputs?}. Stdout is reserved for the MCP protocol — never log there.

Error decoration

HTTP errors include the upstream X-Request-Id when present, so support tickets to LemonSqueezy can reference the exact call. When an error body is JSON with no message the server recognizes, it is surfaced whole, in both the error text and the log line, after the same redaction as audited inputs (see Resources). A non-JSON error body is passed through as-is.

Authority classes

The strongest access control LemonSqueezy itself exposes is the API key boundary. A LemonSqueezy API key authorizes its full account — every store, and every tool except the three License API tools (see below) and the three ls_sink_* bridge tools, which do not use it — and the only way to deny a class of authority through LemonSqueezy is to not give the API key to the agent in the first place. LemonSqueezy's team-membership UI scopes which humans can do which actions in the dashboard, but the public API key inherits the full authority of the account it was issued under; there's no "this key can read but not refund" toggle. So the authoritative boundary, as far as the upstream API is concerned, is which API key the agent has.

That means the env vars below are the primary in-process control surface for anything LemonSqueezy can't gate by itself — per-class rate ceilings (RATE_LIMIT_PER_CLASS), deploy-time class disables (DISABLE_CLASSES), refund caps (MAX_REFUND_AMOUNT_CENTS), and the audit log. They are belt-and-braces in the sense that an operator who can change the server's env can remove them; they are load-bearing in the sense that LemonSqueezy has no equivalent. If you need an agent that genuinely cannot reach a store or a class of action, the durable answer is a separate LemonSqueezy account whose key is never handed to that agent. That answer does not cover the License API tools (see below).

Every tool is tagged with an authority class — a label for the kind of business authority a caller needs to invoke it. The class is separate from the binary destructive/read-only annotation: a customer-record read and a product list are both reads, but only one returns PII; a checkout creation and a refund are both writes, but only one moves money.

That is every tool's class. src/tools/tools.test.ts pins the same map, and moving a tool to another class is a MAJOR change under SEMVER.md.

Note: pii gates only the five customer tools above. It does not keep customer data out of an agent's reach: read-class tools still return customer names and emails incidentally (orders, subscriptions and license keys carry them), ls_list_orders and ls_list_subscriptions accept a userEmail filter, and the order, subscription and license-key get/list tools accept include=customer, which side-loads the customer record. The class is reserved for tools whose primary purpose is the customer record, so LEMONSQUEEZY_DISABLE_CLASSES=pii blocks those tools, not customer data. To keep customer data away from an agent, issue its API key from a separate LemonSqueezy account that doesn't host customer records you care about.

The License API tools are outside the API-key boundary. ls_activate_license, ls_validate_license and ls_deactivate_license authenticate with the license key the caller passes, not the API key, so they work on any LemonSqueezy account's license keys, whichever API key the server holds. A separate LemonSqueezy account does not fence them off, and LEMONSQUEEZY_ALLOWED_STORE_IDS does not gate them. The controls that do reach them, per tool:

• ls_deactivate_license (class key): LEMONSQUEEZY_DISABLE_CLASSES=key, LEMONSQUEEZY_RATE_LIMIT_PER_CLASS=key:N, and LEMONSQUEEZY_DESTRUCTIVE_RATE_LIMIT, which treats every call as destructive. Every call is also audited, with the license key masked (see Resources).
• ls_activate_license (class key): the same two class controls. Activation is additive, so it is not destructive, and the destructive rate limit and the audit log do not see it.
• ls_validate_license (class read): only LEMONSQUEEZY_DISABLE_CLASSES=read or LEMONSQUEEZY_RATE_LIMIT_PER_CLASS=read:N, and both of those also hit every other read. The read-only lock-down below leaves it reachable.

Both key controls also cover ls_update_license_key, the management-API tool in the same class.

The two opt-in env vars that consume this taxonomy:

• LEMONSQUEEZY_RATE_LIMIT_PER_CLASS — caps the call rate per class. LemonSqueezy permissions cannot express "max 2 refunds per hour"; this is the only place that policy can live. This is the load-bearing one for runaway-agent prevention.
• LEMONSQUEEZY_DISABLE_CLASSES — blocks a class outright. Useful when fast deploy-time toggles matter — flipping DISABLE_CLASSES=pii,mutate,money,recurring,key,webhook to lock an analytics deployment into pure reads is a one-line config change (every read tool stays reachable, ls_validate_license included). An operator who can change the server's env can also remove this gate, so for an authoritative deny use a separate LemonSqueezy account whose API key the agent never sees; that does not bound the License API tools.

Both are opt-in; with neither set, every class is allowed and unlimited.

Resources

The server exposes one MCP Resource for clients that prefer structural retrieval over parsing stderr:

Operating the server unattended

For unattended/agentic use against a live store, we recommend:

1. Issue an API key under a LemonSqueezy account that hosts only the store(s) the agent is allowed to touch — LemonSqueezy doesn't expose per-store API-key scoping, so account separation is the durable store boundary. Set LEMONSQUEEZY_ALLOWED_STORE_IDS to the same set as a belt-and-braces in-process gate on the tools that take a storeId. Account separation does not bound the three License API tools, which authenticate with a license key rather than the API key (see Authority classes).
2. Set LEMONSQUEEZY_MAX_REFUND_AMOUNT_CENTS to a per-call cap well below any single-refund expectation.
3. Set LEMONSQUEEZY_DESTRUCTIVE_RATE_LIMIT to a small number (e.g. 5/min) as a runaway-agent circuit breaker. For finer control, add LEMONSQUEEZY_RATE_LIMIT_PER_CLASS=money:2/h,recurring:5/h,key:10/m so each authority class has its own ceiling. If the agent also reports metered usage, size the recurring figure for that too: usage reports count against it.
4. If a class shouldn't be reachable at all (e.g. an analytics agent that needs only read), set LEMONSQUEEZY_DISABLE_CLASSES to the classes you want refused. The server rejects them before the API call is built. For an irrevocable deny, also issue the agent's API key from a separate LemonSqueezy account (the License API tools excepted).
5. Set LEMONSQUEEZY_LOG=audit and ship stderr to your log aggregator. The audit level keeps every destructive-call entry plus errors but drops successful reads so log volume stays bounded over weeks of operation. Alert on status: "guardrail_block" or elevated error rates per tool. Use LEMONSQUEEZY_LOG=all while debugging.
6. Run LEMONSQUEEZY_API_KEY_COMMAND against a vault-backed secret so credentials can rotate without restarting the server process. The API client invalidates its in-process key cache automatically on a 401/403, so a rotated upstream key picks up on the next request rather than waiting on the 1h TTL.

What the server does not do and you must own at the caller level:

• Idempotency / dedupe store — MCP servers are stateless subprocesses; cross-invocation dedupe belongs in your agent or orchestrator.
• Webhook reconciliation — subscribe to LemonSqueezy webhooks in a separate long-running process to reconcile state when API writes succeed but the response is lost. See @yawlabs/lemonsqueezy-webhook-sink for a ready-made sink.
• Metrics / dashboards — the server emits structured logs; derive metrics in your log pipeline.

See SEMVER.md for the versioning policy.

Development

npm install
npm run lint
npm test                  # full unit + handler suite (builds first)
npm run test:integration  # live suite; exits 1 unless LEMONSQUEEZY_TEST_API_KEY + LEMONSQUEEZY_TEST_STORE_ID are set

This repo has no CI: nothing re-runs lint, types or tests on a pull request, so run them locally. npm run test:integration writes throwaway ci-test- resources to a real store.

Containerfile is generated from Dockerfile. After editing Dockerfile:

npm run gen:containerfile    # regenerate Containerfile
npm run check:containerfile  # release.sh step 1 runs this too; non-zero exit means the two have drifted

Running on oam.js (optional)

oam.js runs this server unmodified, and the launcher only runs the server on an oam that is 0.15.2 or newer. Verified against oam 0.9.0: full MCP handshake, all 64 tools, the lemonsqueezy://audit-log resource, working fetch, and guardrail rejections with error text identical to Node. On oam 0.15.2 the MCP handshake and all 64 tools have been re-verified through the launcher, with and without the sandbox below.

oam 0.15.2 is the minimum. The launcher picks the newest oam it can find at or above it, never serves on an older one, and falls back to Node when there is none (LEMONSQUEEZY_MCP_RUNTIME=oam turns that into a hard error). A floor matters here: releases before 0.9.0 ran child_process.execFile arguments through a shell, which was reachable whenever LEMONSQUEEZY_API_KEY_COMMAND is configured -- that feature runs the key command with execFile, deliberately without a shell, and on those releases its arguments were re-split by one anyway.

The published lemonsqueezy-mcp command (bin/lemonsqueezy-mcp.mjs, which is what npx runs) chooses its runtime from these variables:

Sandboxing (opt-in)

Set LEMONSQUEEZY_MCP_SANDBOX=1 to run under oam's --permission model: network restricted to api.lemonsqueezy.com (plus the host of LEMONSQUEEZY_SINK_URL when set), filesystem denied outright, and child-process denied unless LEMONSQUEEZY_API_KEY_COMMAND is configured.

--permission is a process-level flag, so the launcher always starts a fresh oam for it -- even when a client already launches the command under oam 0.15.2+. That is a preference, not a guarantee: if no usable oam can be started, LEMONSQUEEZY_MCP_RUNTIME=auto still serves the server without --permission, and LEMONSQUEEZY_MCP_RUNTIME=oam exits with an error instead.

It is opt-in rather than default because a wrong grant does not fail loudly. oam denies a non-granted environment variable by making it absent from process.env rather than throwing, so an under-granted LEMONSQUEEZY_API_KEY reads as "unauthenticated" rather than "denied". The env allow-list in the launcher is derived from what the shipped bundle actually reads -- if you add a new process.env lookup, extend that list with it.

{
  "mcpServers": {
    "lemonsqueezy": {
      "command": "oam",
      "args": ["run", "/path/to/lemonsqueezy-mcp/dist/index.js"],
      "env": { "LEMONSQUEEZY_API_KEY": "..." }
    }
  }
}

Note the -- separator if you pass arguments to the server rather than to oam: oam run dist/index.js -- version.

The published command prefers oam; it does not require it. oam is not distributed on npm, so npx @yawlabs/lemonsqueezy-mcp has to keep working without it, and it does: discovery is file-existence checks only, never a subprocess, and the fallback runs the server inside the Node process npm already started. With oam installed, though, the command boots Node, runs --version on every oam binary it found to pick the newest, and only then boots oam, so it is always slower than pointing your client at oam directly with the config above. LEMONSQUEEZY_MCP_RUNTIME=node skips oam entirely. An MCP client cold-starts this server once per session, so startup is the cost that actually gets paid -- and it has not been measured for this repo on a current oam. Measure on your own hardware before concluding anything.

Two places oam does win for this repo, both opt-in and neither touching the npm package:

• npm run check:oam — type-checks via oam check (tsgo, TypeScript 7 native). Measured 2878ms against 4406ms for tsc --noEmit, same clean result. npx tsc --noEmit remains the portable default and is what the pre-commit checklist calls for.
• npm run build:binary:oam — builds the standalone binary via oam compile instead of the Node SEA path. Measured 57.14 MB. Writes to the same bin/<platform>-<arch>/ path as the Node SEA build (node scripts/build-binary.mjs), so scripts/stage-release-asset.mjs consumes either unchanged — run one or the other, not both. If you redistribute that binary it embeds oam's runtime, so ship oam's LICENSE, NOTICE and THIRD_PARTY_LICENSES.md with it.

The source stays runtime-agnostic on purpose: no oam: imports anywhere, and tests stay on node:test. That is what keeps the Node fallback real rather than nominal — an oam:test or oam:-prefixed import would make "falls back to Node" false the moment it landed. Any oam invocation writes a bytecode cache to oam/ in the working directory; that path is gitignored.

Releasing

Releases run locally, from a clean checkout of main, with release.sh. This repo has no GitHub Actions workflows (.github/ holds only CODEOWNERS), so pushing a tag by itself publishes nothing. release.sh keeps a CI mode for a tag-triggered release workflow, the intended end state, but nothing invokes it today.

Documentation truncated — see the full README on GitHub.