Abacus
Abacus (now part of Emburse Spend) is an expense management platform that allows businesses to streamline expense reporting, receipts, and reimbursements. The Abacus API is available to partners and enterprise customers, providing programmatic access to member management and expense operations using OAuth 2.0 authentication.
Abacus publishes 3 APIs on the APIs.io network: Authentication API, Expenses API, and Members API. Tagged areas include Accounting, Expense Management, Finance, and Reimbursement.
The Abacus catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Abacus’ developer surface includes authentication, documentation, support, and 10 more developer resources.
Kin Score
Kin Score
How this is scored →scored 2026-07-28 · rubric v0.6
APIs 3
Individual APIs this provider publishes, each with its own machine-readable definition.
Abacus Authentication API
OAuth 2.0 authentication operations
Abacus Expenses API
Expense report management and operations
Abacus Members API
Member management operations for inviting and managing expense users
Pricing Plans 1
Published pricing tiers and plan structures.
Abacus Plans Pricing
PLANSRate Limits 1
Documented rate limits and quota policies.
Abacus Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Abacus Finops
FINOPSFeatures 6
Notable capabilities this provider offers.
Member Management
Invite, update, and suspend organization members programmatically
Expense Tracking
Retrieve and filter expense reports by status, member, and date range
OAuth 2.0 Authentication
Secure API access using client credentials grant flow
Receipt Management
Link receipts to expense reports via URL references
Multi-category Expenses
Categorize expenses across meals, travel, lodging, office supplies, and software
Paginated Results
Paginated API responses with configurable page sizes
Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Abacus Api Context
JSON-LDSpectral Rules 2
Spectral governance rulesets for linting and validating these APIs.
Abacus API Rules
SPECTRALAbacus API Rules
SPECTRALJSON Schema 8
Standalone JSON Schema definitions for this provider's data models.
ExpenseListResponse
JSON SCHEMAExpense
JSON SCHEMAInviteMemberRequest
JSON SCHEMAMemberListResponse
JSON SCHEMAMember
JSON SCHEMAOAuthTokenRequest
JSON SCHEMAOAuthTokenResponse
JSON SCHEMAUpdateMemberRequest
JSON SCHEMAScroll for all 8
JSON Structure 8
JSON Structure definitions describing this provider's data shapes.
Abacus Expense List Response Structure
JSON STRUCTUREAbacus Expense Structure
JSON STRUCTUREAbacus Invite Member Request Structure
JSON STRUCTUREAbacus Member List Response Structure
JSON STRUCTUREAbacus Member Structure
JSON STRUCTUREAbacus Oauth Token Request Structure
JSON STRUCTUREAbacus Oauth Token Response Structure
JSON STRUCTUREAbacus Update Member Request Structure
JSON STRUCTUREScroll for all 8
Examples 8
Example request and response payloads for these APIs.
Abacus Expense Example
EXAMPLEAbacus Member Example
EXAMPLEScroll for all 8
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers build with this provider.
Employee Onboarding
Automatically invite new employees to the expense platform via API
Employee Offboarding
Programmatically suspend departed employees from expense access
Expense Reconciliation
Retrieve and reconcile expense reports for accounting integration
Spend Analytics
Pull expense data by category, member, or date range for reporting
Third-party Integration
Connect Abacus expense data with ERP and accounting systems
Integrations 4
Pre-built integrations with other platforms and tools.
QuickBooks
Sync expense data with QuickBooks for accounting reconciliation
Xero
Integrate with Xero for automated expense accounting
NetSuite
Connect expense reports with NetSuite ERP
Sage Intacct
Sync expenses with Sage Intacct for financial management
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Access & Security 5
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API