Built for your AI assistant

Ask about your time, invoices and pay over MCP, or build on the REST API. Every plan includes both, even Free.

POSThttps://ebillstack.app/api/v1/example-studio/billing/invoices

Authorization: Bearer <token>
Idempotency-Key: 6f1c2a90-invoice-oct

{
  "invoice": {
    "client_id": "cli_01k8z3q0d4m7",
    "currency": "USD",
    "customer_name": "Ridgeline Climbing",
    "issue_date": "2026-10-18"
  },
  "expected_version": 0,
  "hours": { "project_id": "prj_01k8z3q2r6t9", "until": "2026-10-18" }
}

→ 201 Created
{
  "invoice": {
    "id": "inv_01k8z3q9f2c4",
    "status": "draft",
    "amounts": { "total_minor": "937500" }
  }
}

Know the moment it’s paid

Webhooks tell your tools as work moves along. Every event is signed, and failed deliveries are retried for up to three days.

time_entry.approvedA reviewer approved time
invoice.issuedAn invoice was issued
invoice.sentThe invoice email was accepted for delivery
payment.recordedA client payment was recorded
invoice.paidPayments covered the invoice
invoice.voidedAn invoice was voided
credit_note.issuedA credit note was issued
estimate.acceptedA client accepted an estimate
estimate.declinedA client declined an estimate
pay_run.approvedA pay run was approved
notification.bouncedA workspace email bounced

Tokens that follow your role

Create tokens in Settings. The REST API and MCP use the same ones.

One workspaceEach token belongs to one workspace and one person
Scopes you pickRead time, write invoices, approve pay and so on
Never more than your roleA token can’t do what its owner can’t
ExpiresWithin 90 days

API on every plan

Every plan, Free included, comes with the REST API, MCP and webhooks. There’s no separate developer plan.

Compare plans

The API on each plan
Plan	Price	REST, MCP and webhooks
Free1 person, 10 active clients	$0	Included
PaidUp to 3 people, then $3 each	$9 a month	Included

Prices before tax.

Works with AI assistants

Connect Claude Code or another MCP client that takes a bearer token. It sees only what you can see, and each change it makes goes through the same checks as the app.

Try it with your own data

Make a free account and a token. Free covers 1 person and 10 active clients.

Start free See pricing