Accelo

Accelo is a cloud-based service operations automation (ServOps) platform that unifies project management, client relationship management (CRM), time tracking, retainers, quotes, billing, and invoicing for professional services businesses. The Accelo REST API exposes resources such as companies, contacts, activities, tasks, jobs (projects), milestones, invoices, contracts, and webhooks using OAuth 2.0 authentication scoped to a deployment subdomain.

Accelo publishes 8 API contracts indexed on the APIs.io network, including Activities API, Companies API, Contacts API, and 5 more. Tagged areas include Professional Services Automation, Project Management, CRM, Time Tracking, and Invoicing.

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

Accelo’s developer surface includes authentication, documentation, signup flow, pricing, support, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.8/100 thin ▬ flat Agent 24/100 agent aware Front door AI 4/6 moderate Heartbeat 72/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

1 published contract

Professional Services Automation Project Management CRM Time Tracking Invoicing Service Operations

What this lets a business do 1

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

Customer Relationship Management

BC-420

Companies

GET /companies POST /companies

Kin Score

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

Composite quality — 28.8/100 · thin

Contract Quality 8.1 / 19

Developer Ergonomics 4.3 / 15

Access Clarity 2.6 / 15

Operational Transparency 0.3 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · 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 0 / 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 6 / 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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 17.1 — up to +16.6 composite points
Developer Ergonomics scores 28.6 — up to +14.3 composite points
Contract Quality scores 43.2 — up to +14.2 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/accelo/apis.yml: open an issue on github.com/api-evangelist/accelo 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
Xero App Store (SMB finance, payroll, inventory and invoicing apps built on Xero, by region)	builds-on	26.2	-	-

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 2

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)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 8

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

Accelo REST API

REST API for Accelo with CRUD access to companies, contacts, activities, tasks, projects (jobs), milestones, invoices, contracts, quotes, prospects, time entries, staff, and web...

Accelo Activities API

The Activities API from Accelo — 4 operation(s) for activities.

Accelo Companies API

The Companies API from Accelo — 2 operation(s) for companies.

Accelo Contacts API

The Contacts API from Accelo — 2 operation(s) for contacts.

Accelo Issues API

The Issues API from Accelo — 2 operation(s) for issues.

Accelo Jobs API

The Jobs API from Accelo — 2 operation(s) for jobs.

Accelo Tasks API

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

Accelo O Auth API

The OAuth API from Accelo — 1 operation(s) for oauth.

Scroll for all 8

Open Collections 8

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

Accelo REST Activities API

OPEN COLLECTION

Accelo REST Activities Companies API

OPEN COLLECTION

Accelo REST Activities Contacts API

OPEN COLLECTION

Accelo REST Activities Issues API

OPEN COLLECTION

Accelo REST Activities Jobs API

OPEN COLLECTION

Accelo REST Activities OAuth API

OPEN COLLECTION

Accelo REST Activities Tasks API

OPEN COLLECTION

Accelo REST API

OPEN COLLECTION

Scroll for all 8

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Accelo API Rules

39 rules · 37 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Accelo Authentication

oauth2 · 1 scheme

SECURITY

Accelo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Accelo Scopes

4 scopes · authorizationCode/clientCredentials

4 scopes

SCOPES

Agentic Access 1

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

Accelo Agentic Access

29 operations · 14 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Signup

Signup

Login

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 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: accelo
name: Accelo
description: Accelo is a cloud-based service operations automation (ServOps) platform that unifies project management, client
  relationship management (CRM), time tracking, retainers, quotes, billing, and invoicing for professional services businesses.
  The Accelo REST API exposes resources such as companies, contacts, activities, tasks, jobs (projects), milestones, invoices,
  contracts, and webhooks using OAuth 2.0 authentication scoped to a deployment subdomain.
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: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/accelo.png
tags:
- Professional Services Automation
- Project Management
- CRM
- Time Tracking
- Invoicing
- Service Operations
url: https://raw.githubusercontent.com/api-evangelist/accelo/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.23'
apis:
- aid: accelo:accelo-api
  name: Accelo REST API
  description: REST API for Accelo with CRUD access to companies, contacts, activities, tasks, projects (jobs), milestones,
    invoices, contracts, quotes, prospects, time entries, staff, and webhooks. Uses OAuth 2.0 (service, web, and installed
    application grants) with a Bearer access token and deployment-scoped subdomain.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Professional Services Automation
  - Project Management
  - CRM
  - Time Tracking
  - Invoicing
  properties:
  - type: Documentation
    url: https://api.accelo.com/docs/
  - type: Authentication
    url: https://api.accelo.com/docs/#authentication
- aid: accelo:accelo-activities-api
  name: Accelo Activities API
  description: The Activities API from Accelo — 4 operation(s) for activities.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Activities
  properties:
  - type: OpenAPI
    url: openapi/accelo-activities-api-openapi.yml
- aid: accelo:accelo-companies-api
  name: Accelo Companies API
  description: The Companies API from Accelo — 2 operation(s) for companies.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Companies
  properties:
  - type: OpenAPI
    url: openapi/accelo-companies-api-openapi.yml
- aid: accelo:accelo-contacts-api
  name: Accelo Contacts API
  description: The Contacts API from Accelo — 2 operation(s) for contacts.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/accelo-contacts-api-openapi.yml
- aid: accelo:accelo-issues-api
  name: Accelo Issues API
  description: The Issues API from Accelo — 2 operation(s) for issues.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Issues
  properties:
  - type: OpenAPI
    url: openapi/accelo-issues-api-openapi.yml
- aid: accelo:accelo-jobs-api
  name: Accelo Jobs API
  description: The Jobs API from Accelo — 2 operation(s) for jobs.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Job
  tags_raw:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/accelo-jobs-api-openapi.yml
- aid: accelo:accelo-tasks-api
  name: Accelo Tasks API
  description: The Tasks API from Accelo — 2 operation(s) for tasks.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/accelo-tasks-api-openapi.yml
- aid: accelo:accelo-oauth-api
  name: Accelo O Auth API
  description: The OAuth API from Accelo — 1 operation(s) for oauth.
  humanURL: https://api.accelo.com/docs/
  baseURL: https://{deployment}.api.accelo.com/api/v0
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - OAuth
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/accelo-oauth-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/accelo-capability-edges.yml
  name: Accelo Business Capability Map
- type: AgenticAccess
  url: agentic-access/accelo-agentic-access.yml
- type: DomainSecurity
  url: security/accelo-domain-security.yml
- type: Authentication
  url: authentication/accelo-authentication.yml
- type: OAuthScopes
  url: scopes/accelo-scopes.yml
- type: GitHubOrganization
  url: https://github.com/Accelo
- type: LinkedIn
  url: https://www.linkedin.com/company/accelo
- type: Website
  url: https://www.accelo.com
- type: Documentation
  url: https://api.accelo.com/docs/
- type: Signup
  url: https://www.accelo.com/signup/
- type: Pricing
  url: https://www.accelo.com/pricing/
- type: Login
  url: https://app.accelo.com/login/
- type: Support
  url: https://help.accelo.com/
- type: Blog
  url: https://www.accelo.com/resources/blog/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Accelo API — frequently asked questions

Does Accelo have an API?

Yes. APIs.io lists 8 APIs from Accelo, including Accelo REST API, Accelo Activities API and Accelo Companies API, and 5 more.

Is there an OpenAPI specification for the Accelo API?

Yes. APIs.io indexes 7 OpenAPI specifications for Accelo, each linked for download from this page.

How do I authenticate with the Accelo API?

Accelo documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Accelo Authentication.

Is the Accelo API ready for AI agents?

Accelo has a Kin Score of 28.8 out of 100 (thin) and an Agent Readiness score of 23.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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