BSB Lookup API

Free REST API for looking up Australian BSB numbers. All endpoints return JSON and require no authentication.

1,000 requests per day per IP address. Rate limit headers are included in all responses: X-RateLimit-Limit, X-RateLimit-Remaining.

Base URL

https://bsbfinder.com/api/v1

All endpoints return JSON with a consistent structure:

{
  "success": true,
  "data": { ... },
  "meta": {
    "source": "Official BSB Directory",
    "last_updated": "2026-02-01"
  }
}

GET /api/v1/bsb/{bsb}

Look up a single BSB number. Returns branch details, institution info, and payment capabilities.

Example:

curl https://bsbfinder.com/api/v1/bsb/062-000

GET /api/v1/bsb/{bsb}/history

Get the change history for a BSB number. Tracks additions, deletions, and field modifications.

GET /api/v1/search?q={query}

Search BSBs by number, bank name, suburb, or postcode.

Parameters:

GET /api/v1/validate/{bsb}

Validate a BSB number. Returns whether the format is correct and whether the BSB exists in the current directory.

POST /api/v1/bulk

Look up multiple BSBs in a single request. Maximum 50 BSBs per request.

Request body:

{"bsbs": ["062-000", "033-000", "082-001"]}

GET /api/v1/institutions

List all financial institutions with their BSB count.

GET /api/v1/stats

Get aggregate statistics: total BSBs, institutions, states, and last update date.

All BSB data is sourced from official sources and checked daily for updates. Historical changes are tracked and available via the history endpoint.