Read SaaS subscription metrics and manage API-sourced customers, plans, subscriptions and charges in Baremetrics.
Baremetrics ships in the w6w first-party pack. It declares 30 actions, 2 health checks, and the host runs its code in a sandbox that never sees the credential.
io.w6w.baremetricsBaremetrics turns subscription billing data into the metrics a SaaS business steers by: MRR, ARR, churn, LTV, trials and more. This app reads those metrics over any date range, broken out by plan or down to the customers behind a number, and lists the customers, plans, subscriptions, charges and refunds in each connected source.
For teams that bill outside Stripe, Recurly or Braintree, it can also write to the Baremetrics API source: create, update and delete customers, plans, subscriptions and charges. Data that comes from a payment-provider source is read-only, as Baremetrics itself enforces.
Health checks verify the API key and track the hourly request allowance from Baremetrics’ own rate-limit headers.
Three routes to the same 30 actions. The Workflow tab is generated from Baremetrics's own manifest and carries its real ids, so it is copy-pasteable; the Code and CLI examples are the same call for any action on any app, so every app-specific value in them is a blank you fill in.
charge-list List charges in a source, optionally by time range, customer or subscription.
customer-create Create a customer in the Baremetrics API source. Only oid is required.
customer-update Update a customer's name, email, notes or created time. Only customers added through the API can be modified.
metric-get Daily values of one metric over a date range, optionally compared with an earlier period.
metrics-summary Daily summary of every core metric (MRR, ARR, customers, churn, LTV and more) over a date range.
sources-list List the sources (payment providers and the Baremetrics API source) on the account. Every source-scoped action needs one of these ids.
subscription-update Change a subscription's plan, quantity, discount or add-ons.
A workflow step names the app and the action, and the editor fills in the
connection when you pick one. This is the Step shape from the
workflow spec, carrying Baremetrics's real ids.
{
"manifestVersion": "2",
"name": "baremetrics-example",
"steps": [
{
"id": "charge-create",
"uses": {
"app": "io.w6w.baremetrics",
"action": "charge-create",
"connection": "conn_YOUR_CONNECTION_ID"
},
"with": {
"source_id": "<source_id>",
"oid": "<oid>",
"amount": "<amount>"
}
}
]
}charge-create account-get annotations-list charge-get charge-list +25 more actions available
Every app-specific value here is a blank you have to fill in. An
app action is reached through the connection that authenticates it, so the
address is a connection id, not the app id — and connections belong to your account,
so a public page cannot know yours. Create one for Baremetrics, then fill in
the three blanks: conn_YOUR_CONNECTION_ID, the action key, and the
parameters that action declares. The call itself is real — the shape is transcribed
from the studio's own snippet builder, which prints the same kind of blanks — but
nothing in it is specific to Baremetrics. The Workflow tab is where this app's
real ids are.
npm install @w6w/sdkyarn add @w6w/sdkpnpm add @w6w/sdkdeno add npm:@w6w/sdkimport { W6wClient, isActionRun } from "@w6w/sdk";
// Reads W6W_BASE_URL and W6W_TOKEN from the environment when omitted.
const client = new W6wClient();
const envelope = await client.run({
urn: "conn_YOUR_CONNECTION_ID",
action: "charge-create",
payload: {
source_id: "<value>",
oid: "<value>",
amount: "<value>",
currency: "<value>",
customer_oid: "<value>",
// created: "<value>",
// status: "<value>",
// fee: "<value>",
// subscription_oid: "<value>",
},
});
if (isActionRun(envelope)) console.log(envelope.value); npm install -g @w6w/cli w6w run conn_YOUR_CONNECTION_ID --action charge-create --payload '{"source_id":"<value>","oid":"<value>","amount":"<value>","currency":"<value>","customer_oid":"<value>"}' Give an AI agent Baremetrics — without giving it Baremetrics's credentials. One MCP endpoint exposes every app, function and workflow the caller is entitled to, as tools it can discover and run. Access is granted per team while we onboard.
One tool call{
"name": "w6w_invoke",
"arguments": {
"ref": "app:io.w6w.baremetrics#charge-create",
"input": {
"source_id": "<source_id>",
"oid": "<oid>",
"amount": "<amount>"
}
}
}
Every tool names its target with a single ref. The
app: form above doesn't name a connection at all — the
host resolves which of the caller's Baremetrics connections to sign
with, and refuses rather than guesses when the answer is ambiguous.
The token is attached host-side, at the moment of the call. It is never a tool argument, never in the model's context, and never in a transcript — so a prompt injection has nothing to exfiltrate.
Tools are derived per end user from what that person has actually connected and is entitled to — not one shared bot identity carrying the union of everyone's access.
Multi-step work runs on the workflow engine and returns a run handle the agent can poll — retries, branching and state survive the conversation that started them.
Baremetrics's declared health checks are on the surface too, so an agent can tell "the vendor is down" from "your credential expired" before it burns a retry on either.
The MCP surface is part of the hosted platform. Baremetrics itself is MIT, and the runtime that executes it is source-available (FSL).
Baremetrics declares its own checks, so its health is a property of the app rather than something the host guesses at.
Remaining share of the 3,600 requests/hour allowance, from X-RateLimit headers.