Harvest

Harvest is a cloud-based time tracking, project management, expense tracking, and invoicing platform used by agencies, consultancies, and professional services teams to track billable hours, manage budgets, and bill clients. The platform provides reporting on team utilization, project profitability, and budget burn, and integrates with tools like Asana, Trello, Slack, and QuickBooks. Harvest's REST API v2 provides full programmatic access to clients, projects, tasks, time entries, expenses, invoices, estimates, and users using OAuth 2.0 or Personal Access Token authentication.

Harvest publishes 12 API contracts indexed on the APIs.io network, including Clients API, Company API, Estimates API, and 9 more. Tagged areas include Time Tracking, Project Management, Invoicing, Expense Tracking, and Timesheets.

The Harvest catalog on APIs.io includes 1 Spectral governance ruleset.

Harvest’s developer surface includes authentication, documentation, pricing, signup flow, engineering blog, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

47.3/100 developing ▬ flat Agent 22/100 agent aware Front door AI 1/6 silent Heartbeat 98/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Time Tracking Project Management Invoicing Expense Tracking Timesheets Professional Services Harvest

What this lets a business do 3

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Time and Engagement Billing Management

BC-4330

InvoicesTimeEntries

POST /time_entries PATCH /time_entries/{time_entry_id} PATCH /time_entries/{time_entry_id}/stop POST /invoices

Customer Relationship Management

BC-420

Clients

GET /clients POST /clients PATCH /clients/{client_id}

Project & Portfolio Management

BC-900

Projects

POST /projects

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 47.3/100 · developing

Contract Quality 9.1 / 19

Developer Ergonomics 4.3 / 15

Access Clarity 10.7 / 15

Operational Transparency 4.9 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 28.6 — up to +14.3 composite points
Contract Quality scores 48.7 — up to +12.8 composite points
Contract Governance scores 13.6 — up to +10.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/harvest/apis.yml: open an issue on github.com/api-evangelist/harvest to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	builds-on	36.2	-	-
Raycast Store Extensions (first-party publishers + community-wrapped products)	builds-on	36.2	-	-
Obsidian Community Plugins (third-party APIs the Obsidian plugin ecosystem integrates)	builds-on	36.2	-	-
Xero App Store (SMB finance, payroll, inventory and invoicing apps built on Xero, by region)	builds-on	36.2	-	-
IFTTT Services (service publishers)	builds-on	36.2	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

Harvest API v2

REST API for managing clients, projects, tasks, time entries, expenses, invoices, estimates, and users in Harvest. Supports OAuth 2.0 and Personal Access Token authentication, r...

Harvest Clients API

The Clients API from Harvest — 2 operation(s) for clients.

Harvest Company API

The Company API from Harvest — 1 operation(s) for company.

Harvest Estimates API

The Estimates API from Harvest — 2 operation(s) for estimates.

Harvest Expenses API

The Expenses API from Harvest — 2 operation(s) for expenses.

Harvest Invoices API

The Invoices API from Harvest — 2 operation(s) for invoices.

Harvest Projects API

The Projects API from Harvest — 2 operation(s) for projects.

Harvest Reports API

The Reports API from Harvest — 4 operation(s) for reports.

Harvest Roles API

The Roles API from Harvest — 2 operation(s) for roles.

Harvest Tasks API

The Tasks API from Harvest — 2 operation(s) for tasks.

Harvest Users API

The Users API from Harvest — 3 operation(s) for users.

Harvest Time Entries API

The Time Entries API from Harvest — 5 operation(s) for time entries.

Scroll for all 12

Open Collections 12

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Harvest API v2 Clients API

OPEN COLLECTION

Harvest API v2 Clients Company API

OPEN COLLECTION

Harvest API v2 Clients Estimates API

OPEN COLLECTION

Harvest API v2 Clients Expenses API

OPEN COLLECTION

Harvest API v2 Clients Invoices API

OPEN COLLECTION

Harvest API v2 Clients Projects API

OPEN COLLECTION

Harvest API v2 Clients Reports API

OPEN COLLECTION

Harvest API v2 Clients Roles API

OPEN COLLECTION

Harvest API v2 Clients Tasks API

OPEN COLLECTION

Harvest API v2 Clients TimeEntries API

OPEN COLLECTION

Harvest API v2 Clients Users API

OPEN COLLECTION

Harvest API v2

OPEN COLLECTION

Scroll for all 12

Harvest API pricing

Prices published by Harvest, read 2026-09-20 from www.getharvest.com/pricing.

Plan	Price
Free	$0 forever Includes: 1 seat, 2 projects, Time tracking, Invoicing, Expense tracking, Mac & iOS apps
Teams	$9 seat/month Includes: Unlimited seats, time tracking, team reporting, invoicing, accounting and payment integrations; $108
Teams (monthly)	$11 seat/month Includes: All Free features, and Teams features; 30-day free trial
Enterprise	$14 seat/month Includes: All Teams features plus unlimited custom reports, profitability reporting, timesheet approvals, acti
Enterprise (monthly)	$17. 50 seat/month Includes: 30-day free trial
Enterprise Plus	Custom pricing Includes: All Enterprise features, custom integrations, dedicated CSM, white labelling

Plan details, limits and sources →

Rate limits

General API requests: 100 requests per 15 seconds
Reports API requests: 100 requests per 15 minutes

Rate-limit details →

Billed by: seat · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Harvest Plans Pricing

6 plans

PLANS

Harvest Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Harvest Rate Limits

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Harvest

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Harvest Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Harvest API Rules

47 rules · 45 errors 1 warnings 1 info

SPECTRAL

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Harvest Authentication

http · 1 scheme

SECURITY

Harvest Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Harvest Vulnerability Disclosure

no policy recorded

SECURITY

Harvest Trust Center

SOC 2, PCI DSS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Harvest Agentic Access

55 operations · 31 acting · 2 human-in-the-loop

55 operations · 31 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: harvest
name: Harvest
description: Harvest is a cloud-based time tracking, project management, expense tracking, and invoicing platform used by
  agencies, consultancies, and professional services teams to track billable hours, manage budgets, and bill clients. The
  platform provides reporting on team utilization, project profitability, and budget burn, and integrates with tools like
  Asana, Trello, Slack, and QuickBooks. Harvest's REST API v2 provides full programmatic access to clients, projects, tasks,
  time entries, expenses, invoices, estimates, and users using OAuth 2.0 or Personal Access Token authentication.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/harvest.png
tags:
- Time Tracking
- Project Management
- Invoicing
- Expense Tracking
- Timesheets
- Professional Services
- Harvest
url: https://raw.githubusercontent.com/api-evangelist/harvest/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.23'
apis:
- aid: harvest:api-v2
  name: Harvest API v2
  description: REST API for managing clients, projects, tasks, time entries, expenses, invoices, estimates, and users in Harvest.
    Supports OAuth 2.0 and Personal Access Token authentication, requires a Harvest-Account-Id header, and uses standard JSON
    request/response over HTTPS.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Time Tracking
  - Project Management
  - Invoicing
  - Expense Tracking
  - Timesheets
  - OAuth
  - Personal Access Token
  - Authentication
  tags_raw:
  - Time Tracking
  - Project Management
  - Invoicing
  - Expense Tracking
  - Timesheets
  - OAuth 2.0
  - Personal Access Token
  - Authentication
  properties:
  - type: Documentation
    url: https://help.getharvest.com/api-v2/
  - type: Authentication
    url: https://help.getharvest.com/api-v2/authentication-api/authentication/authentication/
  - type: Overview
    url: https://help.getharvest.com/api-v2/introduction/overview/general/
- aid: harvest:harvest-clients-api
  name: Harvest Clients API
  description: The Clients API from Harvest — 2 operation(s) for clients.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Clients
  properties:
  - type: OpenAPI
    url: openapi/harvest-clients-api-openapi.yml
- aid: harvest:harvest-company-api
  name: Harvest Company API
  description: The Company API from Harvest — 1 operation(s) for company.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Company
  properties:
  - type: OpenAPI
    url: openapi/harvest-company-api-openapi.yml
- aid: harvest:harvest-estimates-api
  name: Harvest Estimates API
  description: The Estimates API from Harvest — 2 operation(s) for estimates.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Estimates
  properties:
  - type: OpenAPI
    url: openapi/harvest-estimates-api-openapi.yml
- aid: harvest:harvest-expenses-api
  name: Harvest Expenses API
  description: The Expenses API from Harvest — 2 operation(s) for expenses.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Expenses
  properties:
  - type: OpenAPI
    url: openapi/harvest-expenses-api-openapi.yml
- aid: harvest:harvest-invoices-api
  name: Harvest Invoices API
  description: The Invoices API from Harvest — 2 operation(s) for invoices.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/harvest-invoices-api-openapi.yml
- aid: harvest:harvest-projects-api
  name: Harvest Projects API
  description: The Projects API from Harvest — 2 operation(s) for projects.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/harvest-projects-api-openapi.yml
- aid: harvest:harvest-reports-api
  name: Harvest Reports API
  description: The Reports API from Harvest — 4 operation(s) for reports.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Reports
  properties:
  - type: OpenAPI
    url: openapi/harvest-reports-api-openapi.yml
- aid: harvest:harvest-roles-api
  name: Harvest Roles API
  description: The Roles API from Harvest — 2 operation(s) for roles.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Roles
  properties:
  - type: OpenAPI
    url: openapi/harvest-roles-api-openapi.yml
- aid: harvest:harvest-tasks-api
  name: Harvest Tasks API
  description: The Tasks API from Harvest — 2 operation(s) for tasks.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/harvest-tasks-api-openapi.yml
- aid: harvest:harvest-users-api
  name: Harvest Users API
  description: The Users API from Harvest — 3 operation(s) for users.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/harvest-users-api-openapi.yml
- aid: harvest:harvest-time-entries-api
  name: Harvest Time Entries API
  description: The Time Entries API from Harvest — 5 operation(s) for time entries.
  humanURL: https://help.getharvest.com/api-v2/
  baseURL: https://api.harvestapp.com/v2
  tags:
  - Time Entries
  properties:
  - type: OpenAPI
    url: openapi/harvest-time-entries-api-openapi.yml
common:
- type: RateLimits
  url: rate-limits/harvest-rate-limits.yml
- type: Plans
  url: plans/harvest-plans-pricing.yml
- type: CapabilityMap
  url: capabilities/harvest-capability-edges.yml
  name: Harvest Business Capability Map
- type: AgenticAccess
  url: agentic-access/harvest-agentic-access.yml
- type: TrustCenter
  url: security/harvest-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/harvest-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/harvest-domain-security.yml
- type: Authentication
  url: authentication/harvest-authentication.yml
- type: Website
  url: https://www.getharvest.com
- type: Documentation
  url: https://help.getharvest.com/api-v2/
- type: Pricing
  url: https://www.getharvest.com/pricing
- type: Signup
  url: https://id.getharvest.com/signup
- type: Blog
  url: https://www.getharvest.com/blog
- type: Support
  url: https://help.getharvest.com
- type: StatusPage
  url: https://www.harveststatus.com
- type: GitHubOrganization
  url: https://github.com/harvesthq
- type: LinkedIn
  url: https://www.linkedin.com/company/harvest
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Harvest API — frequently asked questions

Does Harvest have an API?

Yes. APIs.io lists 12 APIs from Harvest, including Harvest API v2, Harvest Clients API and Harvest Company API, and 9 more.

Is there an OpenAPI specification for the Harvest API?

Yes. APIs.io indexes 11 OpenAPI specifications for Harvest, each linked for download from this page.

How do I authenticate with the Harvest API?

Harvest uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Harvest Authentication.

How much does the Harvest API cost?

Harvest publishes its prices; its Free plan is $0 forever as of 2026-09-20. APIs.io lists 6 pricing plans for Harvest, with each plan's price, limits and inclusions under Pricing on this page.

Is the Harvest API ready for AI agents?

Harvest has a Kin Score of 47.3 out of 100 (developing) and an Agent Readiness score of 21.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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