API Reference
DayZero REST API
A predictable, resource-oriented API for advisory firms and scaling businesses. Manage transactions, invoices, bills, journal entries, reconciliations, and financial reports — with cursor pagination, consistent errors, and ready-to-run code samples on every endpoint.
Quick start
All requests require a Bearer token in the Authorization header and a x-business-id header naming the target business. See the authentication guide for token issuance.
curl 'https://api.ondayzero.com/api/v1/businesses' \
-H 'Authorization: Bearer dz_your_token' \
-H 'x-business-id: YOUR_BUSINESS_ID'Endpoints by resource
accounting-dimensions
6 endpoints.
accounting-periods
Manage fiscal periods (month/quarter/year) and period locks.
advisory-firm-reports
Cross-client reporting for advisory firms.
advisory-firm-teams
Team management within advisory firms — assign staff to teams and manage client access.
advisory-firm-templates
7 endpoints.
advisory-firms
Advisory firm management for multi-tenant accounting.
ai-reporting
11 endpoints.
anomalies
AI-powered anomaly detection for unusual transactions and patterns.
ap-approval
Accounts payable approval workflows for bill review and authorization.
api-tokens
Create, list, and revoke Bearer API tokens.
attention
6 endpoints.
bank-deposits
5 endpoints.
billing
Subscription billing, plan management, and usage tracking.
bills
Accounts payable — create and manage vendor bills.
budgets
Financial budgets and forecasts with variance tracking.
businesses
Business entities — the core tenant in DayZero.
catalog-items
5 endpoints.
categorization-profile
2 endpoints.
cfo-portal
55 endpoints.
cfo-projection
10 endpoints.
client-messages
Messaging between advisory firms and their clients.
consolidated-reports
2 endpoints.
contractors
3 endpoints.
counterparty-defaults
4 endpoints.
credit-memos
Customer credits that can be applied to invoices.
customer-statements
2 endpoints.
customers
Customer records for invoicing and AR.
daily-brief
2 endpoints.
delayed-charges
6 endpoints.
document-requests
9 endpoints.
estimates
9 endpoints.
expense-reports
8 endpoints.
fixed-assets
Asset tracking, depreciation schedules, and disposal.
fx-rates
4 endpoints.
intents
1 endpoints.
inventory:accounts_payable
2 endpoints.
inventory:activity
1 endpoints.
inventory:adjustments
Inventory quantity and value adjustments.
inventory:cost_history
1 endpoints.
inventory:counts
7 endpoints.
inventory:forecast
3 endpoints.
inventory:import
Bulk import inventory data from CSV or external systems.
inventory:locations
Warehouse and storage location management.
inventory:lots
1 endpoints.
inventory:payments
Payments linked to inventory orders.
inventory:po_import
4 endpoints.
inventory:production
Production orders and bill-of-materials management.
inventory:products
Product catalog with SKUs, costs, and variants.
inventory:reorder
3 endpoints.
inventory:reports
4 endpoints.
inventory:shipments
Inbound and outbound shipment tracking.
inventory:supply_chain
1 endpoints.
inventory:transfer_suggestions
1 endpoints.
inventory:transfers
Inter-location inventory transfers.
invitations
2 endpoints.
invoices
Accounts receivable — create, finalize, and track invoice payments.
journal-entries
Double-entry bookkeeping with balanced debit/credit lines.
ledgers
Chart of accounts — asset, liability, equity, revenue, and expense accounts.
month-end-packages
4 endpoints.
notes
Internal notes attached to businesses and entities.
notification-preferences
Manage email and in-app notification settings.
notifications
14 endpoints.
oauth
OAuth 2.0 authorization code flow for third-party integrations.
onboarding
User and business onboarding workflows.
payment-advisory
AI-powered payment recommendations and cash flow optimization.
payment-terms
Net payment terms (Net 30, Due on Receipt, etc.).
projects
7 endpoints.
purchase-orders
16 endpoints.
purchase-requisitions
9 endpoints.
quickbooks
7 endpoints.
reconciliations
Bank statement reconciliation with AI-assisted matching.
recurring
Recurring invoice and bill templates with auto-generation.
reports
Financial report generation (P&L, Balance Sheet, Trial Balance, etc.).
sales-receipts
4 endpoints.
search
Full-text search across transactions, contacts, and entities.
subscriptions
Manage recurring subscription billing for customers.
tags
Custom tag groups and tags for categorizing entities.
tax
Tax rate configuration and tax calculations.
time-entries
7 endpoints.
transaction-clarifications
7 endpoints.
transactions
Bank transactions — sync, categorize, review, and reconcile.
user
User profile and preferences.
vendor-contracts
Vendor contract tracking with renewal alerts and spend analysis.
vendor-credits
9 endpoints.
vendors
Vendor management — accounts payable counterparties.
For AI agents
- /llms.txt — short index for LLM ingestion
- /llms-full.txt — full plain-text reference
- OpenAPI 3.1 spec — machine-readable schema
- Every endpoint page exposes a markdown variant at
{path}.mdand a per-endpoint OpenAPI slice at{path}/openapi.json.