Hilos

Hilos is a WhatsApp Business Platform automation company (backed by 500 Global and Techstars, now part of ActiveCampaign) that helps businesses capture leads, qualify prospects, and automate follow-ups over WhatsApp's Cloud API. Its REST API exposes contacts, inbox conversations, WhatsApp message templates, and no-code flow executions, authenticated with an `Authorization: Token` API key against https://api.hilos.io/api/ and paginated with `page` / `page_size` query parameters.

Hilos publishes 6 API contracts indexed on the APIs.io network, including Contact API, Conversation API, Flow Execution API, and 3 more. Tagged areas include Company, WhatsApp, Messaging, Automation, and CRM.

The Hilos catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Hilos’ developer surface includes documentation, API reference, getting-started guide, authentication, engineering blog, signup flow, support, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

49.9/100 developing ▬ flat Agent 37/100 agent ready Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company WhatsApp Messaging Automation CRM Conversational Commerce Chatbots Customer Engagement Marketing A2A

What this lets a business do 2

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

Application Communications

AE-150

ConversationWhats App

POST /api/channels/whatsapp/template/{id}/send GET /api/inbox/conversation

Customer Relationship Management

BC-420

Contact

GET /api/contact POST /api/contact

Kin Score

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

Composite quality — 49.9/100 · developing

Contract Quality 11.1 / 19

Developer Ergonomics 8.8 / 15

Access Clarity 5.1 / 15

Operational Transparency 0.0 / 10

Contract Governance 2.9 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 5.0 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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 AI & Biometrics 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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 34.2 — up to +13.2 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Contract Quality scores 59.4 — up to +10.2 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/hilos/apis.yml: open an issue on github.com/api-evangelist/hilos 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 →

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.

Agent2Agent

measured — observed by APIs.io (flavored)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Hilos Contact API

The Contact API from Hilos — 2 operation(s) for contact.

Hilos Conversation API

The Conversation API from Hilos — 2 operation(s) for conversation.

Hilos Flow Execution API

The Flow Execution API from Hilos — 3 operation(s) for flow execution.

Hilos Flow Execution Contact API

The Flow Execution Contact API from Hilos — 2 operation(s) for flow execution contact.

Hilos User API

The User API from Hilos — 1 operation(s) for user.

Hilos Whats App API

The Whats App API from Hilos — 3 operation(s) for whats app.

Open Collections 6

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

Hilos Contact API

OPEN COLLECTION

Hilos Contact Conversation API

OPEN COLLECTION

Hilos Contact Flow Execution API

OPEN COLLECTION

Hilos Contact Flow Execution Contact API

OPEN COLLECTION

Hilos Contact User API

OPEN COLLECTION

Hilos Contact WhatsApp API

OPEN COLLECTION

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Manage inbox conversations

AGENT SKILL

Send a WhatsApp template message

AGENT SKILL

Sync a contact and run a flow

AGENT SKILL

Hilos API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Hilos Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hilos Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Hilos Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Hilos Events

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Hilos API Rules

57 rules · 51 errors 4 warnings 2 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Hilos Openapi Overlay

2 actions · update · hilos-openapi-original.yml

DERIVED

Security Posture 2

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

Hilos Authentication

apiKey · 1 scheme

SECURITY

Hilos Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Hilos Agentic Access

19 operations · 9 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

WellKnown

WellKnown

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

Lifecycle

DataModel

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

CapabilityMap

Overlay

AgentCard

Events

Source (apis.yml)

aid: hilos
name: Hilos
description: 'Hilos is a WhatsApp Business Platform automation company (backed by 500 Global and Techstars, now part of ActiveCampaign)
  that helps businesses capture leads, qualify prospects, and automate follow-ups over WhatsApp''s Cloud API. Its REST API
  exposes contacts, inbox conversations, WhatsApp message templates, and no-code flow executions, authenticated with an `Authorization:
  Token` API key against https://api.hilos.io/api/ and paginated with `page` / `page_size` query parameters.'
url: https://raw.githubusercontent.com/api-evangelist/hilos/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- techstars
x-tier: stub
x-tier-reason: portfolio-lead
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: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-13'
image: https://app.hilos.io/logo512.png
tags:
- Company
- WhatsApp
- Messaging
- Automation
- CRM
- Conversational Commerce
- Chatbots
- Customer Engagement
- Marketing
- A2A
apis:
- aid: hilos:hilos-contact-api
  name: Hilos Contact API
  description: The Contact API from Hilos — 2 operation(s) for contact.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - Contact
  properties:
  - type: OpenAPI
    url: openapi/hilos-contact-api-openapi.yml
- aid: hilos:hilos-conversation-api
  name: Hilos Conversation API
  description: The Conversation API from Hilos — 2 operation(s) for conversation.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - Conversations
  tags_raw:
  - Conversation
  properties:
  - type: OpenAPI
    url: openapi/hilos-conversation-api-openapi.yml
- aid: hilos:hilos-flow-execution-api
  name: Hilos Flow Execution API
  description: The Flow Execution API from Hilos — 3 operation(s) for flow execution.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - Flow Execution
  properties:
  - type: OpenAPI
    url: openapi/hilos-flow-execution-api-openapi.yml
- aid: hilos:hilos-flow-execution-contact-api
  name: Hilos Flow Execution Contact API
  description: The Flow Execution Contact API from Hilos — 2 operation(s) for flow execution contact.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - Flow Execution Contact
  properties:
  - type: OpenAPI
    url: openapi/hilos-flow-execution-contact-api-openapi.yml
- aid: hilos:hilos-user-api
  name: Hilos User API
  description: The User API from Hilos — 1 operation(s) for user.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/hilos-user-api-openapi.yml
- aid: hilos:hilos-whats-app-api
  name: Hilos Whats App API
  description: The Whats App API from Hilos — 3 operation(s) for whats app.
  humanURL: https://hilos.io/docs
  baseURL: https://api.hilos.io/api/
  tags:
  - WhatsApp
  tags_raw:
  - Whats App
  properties:
  - type: OpenAPI
    url: openapi/hilos-whats-app-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/hilos-capability-edges.yml
  name: Hilos Business Capability Map
- type: Overlay
  url: overlays/hilos-openapi-overlay.yaml
- type: DomainSecurity
  url: security/hilos-domain-security.yml
- type: AgenticAccess
  url: agentic-access/hilos-agentic-access.yml
- type: Website
  url: https://hilos.io
- type: DeveloperPortal
  url: https://hilos.io/docs
- type: Documentation
  url: https://hilos.io/docs
- type: APIReference
  url: https://hilos.io/docs/developer/apidocs/contact/get-apicontact
- type: GettingStarted
  url: https://hilos.io/docs/developer/getting-started/test-request
- type: Authentication
  url: authentication/hilos-authentication.yml
- type: Blog
  url: https://hilos.io/blog
- type: Plans
  url: plans/hilos-plans-pricing.yml
- type: SignUp
  url: https://hilos.io/signup-ac
- type: Login
  url: https://app.hilos.io/login
- type: TermsOfService
  url: https://hilos.io/terms-and-conditions
- type: PrivacyPolicy
  url: https://hilos.io/privacy-policy
- type: Support
  url: mailto:hey@hilos.io
- type: LLMsTxt
  url: llms/hilos-llms.txt
- type: Conventions
  url: conventions/hilos-conventions.yml
- type: ErrorCatalog
  url: errors/hilos-problem-types.yml
- type: Conformance
  url: conformance/hilos-conformance.yml
- type: Lifecycle
  url: lifecycle/hilos-lifecycle.yml
- type: DataModel
  url: data-model/hilos-data-model.yml
- type: X-MCPServerCandidate
  url: mcp/hilos-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: ToolCrosswalk
  url: mcp/hilos-tool-crosswalk.yml
- type: AgentCard
  url: a2a/hilos-a2a.yml
- type: WellKnown
  url: well-known/hilos-well-known.yml
- type: Packages
  url: packages/hilos-packages.yml
- type: RateLimits
  url: rate-limits/hilos-rate-limits.yml
- type: Events
  url: asyncapi/hilos-events.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 9
  pass: local-v1

Hilos API — frequently asked questions

Does Hilos have an API?

Yes. APIs.io lists 6 APIs from Hilos, including Hilos Contact API, Hilos Conversation API and Hilos Flow Execution API, and 3 more.

Is there an OpenAPI specification for the Hilos API?

Yes. APIs.io indexes 6 OpenAPI specifications for Hilos, each linked for download from this page.

How do I authenticate with the Hilos API?

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

Is the Hilos API ready for AI agents?

Hilos has a Kin Score of 49.9 out of 100 (developing) and an Agent Readiness score of 37.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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