The API Report CardAPI Index
THE API REPORT CARD / Financial Services / Bill.com
Bill.com

Bill.com API

AP/AR Automation, Spend & Expense, B2B Payments (SMB) · bill.com

BILL runs a mature self-serve developer program: v3 and v2 (LTS) REST APIs, a sandbox isolated from production, free developer keys, and partner endpoints for embedded use. Webhooks span AP, AR, and spend events. Rate limits are published at 20,000 requests per hour per developer key.

Last verified: July 2026Financial Services
API GRADE
A
VERIFIED JUL 2026

SCORECARD

ExistenceGOODPublic v3 REST API (plus v2 on long-term support) documented at developer.bill.com with an OpenAPI spec.
AccessGOODSelf-serve key issuance and sandbox signup with no paywall or sales gate; partner endpoints support embedded use.
CoverageGOODAP bills and payments, AR invoices, vendors, orgs and users via partner endpoints, plus a separate Spend & Expense API.
AuthGOODDeveloper-key based, with a partner login-as-user flow for embedded scenarios; Spend & Expense uses token auth.
Docs & DXGOODAPI reference, guides, Postman collection, video tutorials, changelog, and a data-isolated sandbox for payment testing.
StabilityGOODDocumented limits: 20,000 requests/hour per developer key and 3 concurrent requests per org; v2 is LTS with no end date.
MORE FROM THE REPORT CARD
AirbaseD+AnsaradaCAvidXchangeFBILL Spend & ExpenseC
Supergood: Bill.com shipped a real API. Most vendors don't; we ship near-native APIs for the rest.

Frequently asked questions

Bill.com scores A on the API Report Card. BILL runs a mature self-serve developer program: v3 and v2 (LTS) REST APIs, a sandbox isolated from production, free developer keys, and partner endpoints for embedded use. Webhooks span AP, AR, and spend events. Rate limits are published at 20,000 requests per hour per developer key.

Tried to integrate with Bill.com?
© Supergood Systems, Inc.