Build on AskBooks
REST API. OAuth 2.0. Webhooks. Full OpenAPI spec. Build internal tools or list on the AskBooks marketplace.
curl https://api.askbooks.in/v1/invoices \
-H "Authorization: Bearer ${ASKBOOKS_API_TOKEN}" \
-H "Content-Type: application/json" \
-d '{
"party_id": "01H...",
"invoice_date": "2026-04-15",
"items": [
{ "description": "Consulting hours", "qty": 10, "rate": 2500 }
]
}'150+ endpoints
Every entity in AskBooks is API-accessible. Invoices, parties, items, payments, banking, GST returns, and more.
Outbound webhooks
Subscribe to invoice.created, payment.received, and 40+ events. HMAC-signed. Auto-retry with exponential backoff.
OAuth 2.0
PKCE-flow OAuth for third-party apps. Scope-based access control. Revocable per-tenant.
Rate limits
10 req/sec for sandbox, 100 req/sec for production. Burst-friendly. Per-token quotas.
OpenAPI 3.1
Machine-readable spec. Generate SDKs. Postman collection auto-published.
Versioned
V1 stable. We never break v1 — additive-only changes. Deprecation policy: 12-month notice minimum.
Need a hand?
Email developers@askbooks.in or join our developer Discord. We respond within hours.