Billit API

Name: Billit API API
Brand: Billit API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentFinanceAccountingapiKey4 EndpointsREST

For Agents

List and create invoices and pull customer and expense records from the Billit invoicing and accounting platform.

Quickstart

Get started with Billit API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"create an invoice in Billit"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Billit API API.

Create new invoices in Billit with customer, line item, and amount data

List existing invoices to drive dashboards or downstream reconciliation

Retrieve the customer list to populate dropdowns or sync with external CRMs

Pull expense records for categorisation, reporting, or accounting tool sync

Use Cases

GET STARTED

Start building with Billit API API

Explore with Jentic

View OpenAPI Document

Use for: I want to create a new invoice in Billit, List all invoices I have issued, Retrieve the customer list from Billit, Get the latest expenses recorded in Billit

Not supported: Does not handle card payment processing, payroll, or general ledger entries — use for creating Billit invoices and reading customer and expense records only.

Jentic publishes the only available OpenAPI document for Billit API, keeping it validated and agent-ready.

Jentic publishes the only available OpenAPI specification for Billit API, keeping it validated and agent-ready. The Billit API is the programmatic interface to the Billit invoicing and accounting automation platform, exposing a small set of endpoints for listing invoices, creating new invoices, and retrieving customers and expenses. Authentication is by API key in the Authorization header. The current spec covers four core read and create operations.

★ Programmatic Invoice Creation

Service businesses and SaaS companies want to issue invoices automatically when a job completes or a billing cycle closes. The Billit API exposes POST /invoices for creation and GET /invoices for retrieval, so a billing job can issue a new invoice and confirm it was recorded in a single round trip. Integration is typically a half day for a basic create-and-confirm flow.

Create an invoice for customer Acme Ltd with one line item of 500 EUR via POST /invoices, then list invoices and confirm the new one is present.

Customer Sync to a CRM

Operations teams want their CRM and invoicing tool to share the same customer list so sales activity matches billing records. The Billit API provides GET /customers to pull all customers, which a nightly job can compare against a CRM and reconcile differences. Setup is usually one day for a one-way sync.

Pull the full customer list from GET /customers and upsert each record into a HubSpot company list.

Expense Reporting Pipeline

Finance teams run weekly expense reports that combine multiple sources. The Billit API exposes GET /expenses, allowing a scheduled job to pull recent expenses and feed them into a BI tool or accounting software. Setup is half a day for a single feed, and the small endpoint surface keeps maintenance light.

Pull all expenses from GET /expenses and write each record as a row in a Google Sheet for the weekly finance review.

AI Agent Invoicing Assistant via Jentic

An AI assistant for self-employed users can create invoices and pull expense or customer records via natural-language requests routed through Jentic. The API key is stored in the Jentic vault, so the assistant never sees the raw secret, and Jentic returns the right Billit operation when the user asks something like "create an invoice for Acme for 500 euros". Setup through Jentic takes under an hour.

Search Jentic for 'create an invoice in Billit', load the POST /invoices schema, and execute it with a one-line invoice for 500 EUR to a named customer.

Key Endpoints

4 endpoints — jentic publishes the only available openapi specification for billit api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

POST

/invoices

Create a new invoice

GET

/invoices

List all invoices

GET

/customers

List all customers

GET

/expenses

List all expenses

POST

/invoices

Create a new invoice

GET

/invoices

List all invoices

GET

/customers

List all customers

GET

/expenses

List all expenses

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Billit API keys are stored encrypted in the Jentic vault (MAXsystem). Agents receive scoped access tokens — the raw Authorization key never enters the agent's context or logs.

Intent-based discovery

Agents search by intent (e.g., 'create an invoice in Billit') and Jentic returns the matching Billit operation with its input schema, so the agent can call POST /invoices without browsing third-party docs.

Time to first call

Direct Billit integration: 1-2 days for invoice creation, customer sync, and expense pulls. Through Jentic: under 1 hour — search, load schema, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Billit Belgium

The Belgian Billit platform with full invoicing, Peppol e-invoicing, and cashbook scope

Choose billit.be for the full Belgian invoicing API surface; choose billit.io when working with the global product's smaller endpoint set.

Alternative

Billingo

Hungarian invoicing platform with Online Számla reporting

Choose Billingo when issuing Hungarian invoices that must be reported to NAV; choose Billit for general invoicing automation.

Complementary

Stripe

Card and bank-payment processor that pairs with Billit for invoice collection

Use Stripe to collect payment, then call Billit to create the corresponding invoice record.

Alternative

Xero Accounting

International cloud accounting platform with broad invoicing and ledger support

Choose Xero for full accounting and ledger integration; choose Billit for a lightweight invoicing-and-expenses surface.

FAQs

Specific to using Billit API API through Jentic.

Why is there no official OpenAPI spec for Billit API?

Billit does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Billit API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Billit API use?

The Billit API uses an API key in the Authorization header. You generate the key from the Billit dashboard. When called via Jentic, the key is held in the MAXsystem vault so the raw Authorization value never reaches the agent's context.

Can I create invoices with the Billit API?

Yes. POST /invoices creates a new invoice from a JSON body. GET /invoices lists existing invoices, which is the recommended way to confirm a freshly created record was persisted.

What are the rate limits for the Billit API?

The current spec does not declare explicit numeric rate limits. Treat 429 responses as the signal to back off, and call the Jentic SDK, which retries on 429 with exponential back-off so high-volume jobs do not have to handle this by hand.

How do I create an invoice through Jentic?

Search Jentic for 'create an invoice in Billit', which surfaces POST /invoices. Load the schema, supply customer and line-item data, and execute. The Python flow is: pip install jentic, then await client.search, await client.load, await client.execute.

Can I list customers and expenses through the Billit API?

Yes. GET /customers returns all customers and GET /expenses returns all expenses. These two endpoints are read-only in the current spec, suitable for sync jobs and reporting pipelines but not for editing customer or expense records.