Light

Light is an agentic accounting and financial-operations platform positioned as an alternative to traditional ERPs and fragmented finance stacks. It combines a multi-entity general ledger and consolidation engine with accounts payable, accounts receivable, spend management and corporate cards, contracts and subscription billing, purchase orders and expense reimbursement. The Light API is a REST API over HTTPS returning camelCase JSON, covering 183 operations across 28 resource groups — invoice payables and receivables, credit notes, customer credits, journal entries, ledger accounts, bank accounts and transactions, cards and card transactions, contracts, purchase orders, products, vendors, customers and users. Authentication is either an API key sent as HTTP Basic or an OAuth 2.0 access token, access is governed by the same roles as user accounts, and writes on 14 operations accept an X-Idempotency-Key header. Light also publishes a live Model Context Protocol server over its documentation and markets a Claude MCP integration against the live ledger.

Light publishes 1 API on the APIs.io network. Tagged areas include Accounting, Finance, ERP, Accounts Payable, and Accounts Receivable.

Light’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, authentication, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
42.2/100 thin Agent 81/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
AccountingFinanceERPAccounts PayableAccounts ReceivableGeneral LedgerSpend ManagementInvoicingCorporate CardsExpense ManagementFinancial OperationsAgentsCompany

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 42.2/100 · thin
Contract Quality 9.4 / 25
Developer Ergonomics 13.5 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 81/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/light: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

Light API

REST API for the Light accounting and financial-operations platform. 183 operations across 28 resource groups covering the general ledger, accounts payable and receivable, bank ...

MCP Servers

light-mcp.yml

MCP SERVER

Rate Limits

Light Rate Limits

0 limits

RATE LIMITS

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conformance
Conformance
 DataModel
DataModel

Access & Security 4

Authentication, authorization, and security posture

Compliance
Compliance
 TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Support
Support
 RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: light
name: Light
description: Light is an agentic accounting and financial-operations platform positioned as an alternative to traditional
  ERPs and fragmented finance stacks. It combines a multi-entity general ledger and consolidation engine with accounts payable,
  accounts receivable, spend management and corporate cards, contracts and subscription billing, purchase orders and expense
  reimbursement. The Light API is a REST API over HTTPS returning camelCase JSON, covering 183 operations across 28 resource
  groups — invoice payables and receivables, credit notes, customer credits, journal entries, ledger accounts, bank accounts
  and transactions, cards and card transactions, contracts, purchase orders, products, vendors, customers and users. Authentication
  is either an API key sent as HTTP Basic or an OAuth 2.0 access token, access is governed by the same roles as user accounts,
  and writes on 14 operations accept an X-Idempotency-Key header. Light also publishes a live Model Context Protocol server
  over its documentation and markets a Claude MCP integration against the live ledger.
image: https://light.inc/assets/images/og-home.jpg
url: https://raw.githubusercontent.com/api-evangelist/light/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- balderton-capital
- seedcamp
x-tier: enriched
x-tier-reason: real-openapi-and-docs
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Accounting
- Finance
- ERP
- Accounts Payable
- Accounts Receivable
- General Ledger
- Spend Management
- Invoicing
- Corporate Cards
- Expense Management
- Financial Operations
- Agents
- Company
apis:
- aid: light:light-api
  name: Light API
  description: REST API for the Light accounting and financial-operations platform. 183 operations across 28 resource groups
    covering the general ledger, accounts payable and receivable, bank accounts and reconciliation, cards and card transactions,
    expenses, contracts, purchase orders and master data. JSON in camelCase, cursor or offset pagination with a field:operator:value
    filter grammar, an X-Idempotency-Key header on 14 write operations, and API-key or OAuth 2.0 bearer authentication.
  humanURL: https://docs.light.inc/getting-started/introduction
  baseURL: https://api.light.inc
  tags:
  - Accounting
  - General Ledger
  - Accounts Payable
  - Accounts Receivable
  - Spend Management
  properties:
  - type: OpenAPI
    url: openapi/light-openapi-original.json
  - type: Overlay
    url: overlays/light-openapi-overlay.yaml
  - type: Documentation
    url: https://docs.light.inc/getting-started/introduction
  - type: Authentication
    url: https://docs.light.inc/getting-started/authentication
  - type: RateLimits
    url: https://docs.light.inc/getting-started/rate-limits
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/light-agentic-access.yml
- type: Website
  url: https://light.inc/
- type: DeveloperPortal
  url: https://docs.light.inc/getting-started/introduction
- type: Documentation
  url: https://docs.light.inc/getting-started/introduction
- type: APIReference
  url: https://docs.light.inc/api-reference/customers/001-overview
- type: GettingStarted
  url: https://docs.light.inc/getting-started/introduction
- type: Support
  url: https://light.inc/help
- type: Blog
  url: https://light.inc/blog
- type: SignUp
  url: https://light.inc/book-a-demo
- type: Login
  url: https://app.light.inc/
- type: TermsOfService
  url: https://light.inc/terms
- type: PrivacyPolicy
  url: https://light.inc/privacy
- type: Compliance
  url: https://light.inc/soc-2
- type: TrustCenter
  url: security/light-trust-center.yml
- type: DomainSecurity
  url: security/light-domain-security.yml
- type: Authentication
  url: authentication/light-authentication.yml
- type: Conventions
  url: conventions/light-conventions.yml
- type: Idempotency
  url: conventions/light-conventions.yml
- type: ErrorCatalog
  url: errors/light-problem-types.yml
- type: RateLimits
  url: rate-limits/light-rate-limits.yml
- type: Lifecycle
  url: lifecycle/light-lifecycle.yml
- type: Conformance
  url: conformance/light-conformance.yml
- type: DataModel
  url: data-model/light-data-model.yml
- type: MCPServer
  url: mcp/light-mcp.yml
- type: LLMsTxt
  url: llms/light-llms.txt
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence