Bill.com API
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.
Frequently asked questions
Bill.com scores A on Supergood's 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.
Bill.com has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
BILL (NYSE: BILL, legal name BILL Holdings, Inc., formerly Bill.com Holdings) is a San Jose, CA-headquartered financial-operations platform for small and mid-sized businesses and the accounting firms that serve them.
Vertical: Financial Services (AP automation, AR automation, spend management, B2B payments). Bill ingestion via email, scan, fax, supplier portal upload, or API push. AI-assisted bill data extraction (header + line items + GL coding). Multi-step approval routing with audit trail.
Very high within SMB AP/AR and accounting-firm tech. 500K+ businesses, 8.3M+ network members, ~$345B/yr payment volume, ~1% of U.S. GDP flows through BILL.
Bills (AP): vendor, bill #, invoice date, due date, amount, line items, GL/department/location/class/job coding, attached document image, approval state, audit log.
Founded 2006; ~20 years old as of 2026. Older than the modern fintech wave (Ramp/Brex/Mercury) but younger than AvidXchange (2000).
Supergood's grades measure one thing: can a customer's engineering team get their own data out programmatically? Supergood checks six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and rolls them into a letter grade. Supergood re-verifies grades, and they only move on evidence.
Bill.com has partial MCP support. A third-party MCP server for the BILL Accounts Payable and Receivable API is maintained on GitHub by Civic, with commits as recent as March 2026. BILL itself has not published an official MCP server.
Partially. MCP support for Bill.com exists but is incomplete, so what MCP clients like Claude, Cursor, and Codex can reach depends on what the available server covers.