Heffl

Heffl is an AI‑first CRM that works from your inbox, keeping conversations and deals together, briefing you before meetings, and drafting follow‑ups for approval. It integrates with ChatGPT and Claude, offering a smart inbox for small businesses. The platform automates lead capture, email tracking, and pipeline management, providing real‑time insights and AI‑generated suggestions to improve sales efficiency. Users can customize workflows, set reminders, and collaborate with team members, all within a secure, cloud‑based environment. Heffl aims to replace traditional CRMs by delivering a conversational, context‑aware experience that streamlines customer relationship management for small teams.

Heffl publishes 8 API contracts indexed on the APIs.io network, including Clients API, Deals API, Invoices API, and 5 more. Tagged areas include CRM, Artificial Intelligence, Small Business, Inbox, and Automation.

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

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

🌐 Visit website 📡 Profile data on GitHub

47.2/100 developing Agent 51/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract 5 Agent Skills

CRM Artificial Intelligence Small Business Inbox Automation

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 47.2/100 · developing

Contract Quality 10.4 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 9.0 / 17

Operational Transparency 1.6 / 11

Contract Governance 2.2 / 10

Discoverability 6.5 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 51/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 5 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →

2 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 49.0 — up to +12.8 composite points Ask about this →
Operational Transparency scores 14.3 — up to +11.1 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →

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.

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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/heffl-com/apis.yml: open an issue on github.com/api-evangelist/heffl-com 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 5

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 (conformant)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 8

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

Heffl Clients API

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

Heffl Deals API

The Deals API from Heffl — 2 operation(s) for deals.

Heffl Invoices API

The Invoices API from Heffl — 1 operation(s) for invoices.

Heffl Leads API

The Leads API from Heffl — 2 operation(s) for leads.

Heffl Reference Data API

The Reference Data API from Heffl — 7 operation(s) for reference data.

Heffl Tasks API

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

Heffl Users API

The Users API from Heffl — 1 operation(s) for users.

Heffl Webhooks API

The Webhooks API from Heffl — 2 operation(s) for webhooks.

Scroll for all 8

Agent Skills 5

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

heffl-com-create-and-retrieve-lead

AGENT SKILL

heffl-com-create-client

AGENT SKILL

heffl-com-create-deal

AGENT SKILL

heffl-com-create-task

AGENT SKILL

heffl-com-manage-webhooks

AGENT SKILL

Heffl API pricing

Prices published by Heffl, read 2026-11-11 from heffl.com/pricing.

Plan	Price
Heffl	$12/user/month
Heffl	$14 per user per month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Heffl Plans Pricing

2 plans

PLANS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Heffl API Rules

52 rules · 49 error-severity 2 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Heffl Authentication

1 scheme

SECURITY

Heffl Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Heffl Agentic Access

33 operations · 15 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

DeveloperPortal

DeveloperPortal

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

AgentSkill

LLMsTxt

WellKnown

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

Conventions

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

PrivacyPolicy

Plans

Pricing

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: heffl-com
name: Heffl
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://heffl.com/og/og-image.jpg
description: Heffl is an AI‑first CRM that works from your inbox, keeping conversations and deals together, briefing you before
  meetings, and drafting follow‑ups for approval. It integrates with ChatGPT and Claude, offering a smart inbox for small
  businesses. The platform automates lead capture, email tracking, and pipeline management, providing real‑time insights and
  AI‑generated suggestions to improve sales efficiency. Users can customize workflows, set reminders, and collaborate with
  team members, all within a secure, cloud‑based environment. Heffl aims to replace traditional CRMs by delivering a conversational,
  context‑aware experience that streamlines customer relationship management for small teams.
url: https://artifacts.apis.io/heffl-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-11'
modified: '2026-11-11'
tags:
- CRM
- Artificial Intelligence
- Small Business
- Inbox
- Automation
tags_raw:
- CRM
- AI
- Small Business
- Inbox
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: PrivacyPolicy
  url: https://heffl.com/privacy-policy
- type: GettingStarted
  url: https://docs.heffl.com/getting-started/untitled-page
- type: Documentation
  url: https://docs.heffl.com/
- type: AgenticAccess
  url: agentic-access/heffl-com-agentic-access.yml
- type: Plans
  url: plans/heffl-com-plans-pricing.yml
- type: Spectral
  url: rules/heffl-com-rules.yml
- type: Vocabulary
  url: vocabulary/heffl-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Conventions
  url: conventions/heffl-com-conventions.yml
- type: Authentication
  url: authentication/heffl-com-authentication.yml
- type: Conformance
  url: conformance/heffl-com-conformance.yml
- type: LLMsTxt
  url: llms/heffl-com-llms.txt
- type: AgentCard
  url: a2a/heffl-com-a2a.yml
- type: WellKnown
  url: well-known/heffl-com-well-known.yml
- type: Hosts
  url: hosts/heffl-com-hosts.yml
- type: Vendors
  url: vendors/heffl-com-vendors.yml
- type: ChangeLog
  url: https://heffl.com/changelog
- type: SignUp
  url: http://app.heffl.com/signup
- type: DeveloperPortal
  url: https://docs.heffl.com\
- type: DomainSecurity
  url: security/heffl-com-domain-security.yml
- type: Website
  url: https://heffl.com/
- type: APIReference
  url: https://heffl.com/api-docs
- type: Support
  url: https://heffl.com/support
- type: Blog
  url: https://heffl.com/blog
- type: Pricing
  url: https://heffl.com/pricing
- type: TermsOfService
  url: https://heffl.com/terms
apis:
- aid: heffl-com:heffl-com-clients-api
  name: Heffl Clients API
  description: The Clients API from Heffl — 2 operation(s) for clients.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Clients
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-clients-api-openapi.yml
- aid: heffl-com:heffl-com-deals-api
  name: Heffl Deals API
  description: The Deals API from Heffl — 2 operation(s) for deals.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Deals
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-deals-api-openapi.yml
- aid: heffl-com:heffl-com-invoices-api
  name: Heffl Invoices API
  description: The Invoices API from Heffl — 1 operation(s) for invoices.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-invoices-api-openapi.yml
- aid: heffl-com:heffl-com-leads-api
  name: Heffl Leads API
  description: The Leads API from Heffl — 2 operation(s) for leads.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Leads
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-leads-api-openapi.yml
- aid: heffl-com:heffl-com-reference-data-api
  name: Heffl Reference Data API
  description: The Reference Data API from Heffl — 7 operation(s) for reference data.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Reference Data
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-reference-data-api-openapi.yml
- aid: heffl-com:heffl-com-tasks-api
  name: Heffl Tasks API
  description: The Tasks API from Heffl — 2 operation(s) for tasks.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-tasks-api-openapi.yml
- aid: heffl-com:heffl-com-users-api
  name: Heffl Users API
  description: The Users API from Heffl — 1 operation(s) for users.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-users-api-openapi.yml
- aid: heffl-com:heffl-com-webhooks-api
  name: Heffl Webhooks API
  description: The Webhooks API from Heffl — 2 operation(s) for webhooks.
  humanURL: https://docs.heffl.com/api-reference/introduction
  baseURL: https://api.heffl.com/api/v1
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/heffl-com-webhooks-api-openapi.yml
x-enrichment:
  date: '2026-11-11'
  status: enriched
  artifacts_added: 36
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Heffl API — frequently asked questions

Does Heffl have an API?

Yes. APIs.io lists 8 APIs from Heffl, including Heffl Clients API, Heffl Deals API and Heffl Invoices API, and 5 more.

Is there an OpenAPI specification for the Heffl API?

Yes. APIs.io indexes 8 OpenAPI specifications for Heffl, each linked for download from this page.

How do I authenticate with the Heffl API?

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

How much does the Heffl API cost?

Heffl publishes its prices; its Heffl plan is $12/user/month as of 2026-11-11. APIs.io lists 2 pricing plans for Heffl, with each plan's price, limits and inclusions under Pricing on this page.

Is the Heffl API ready for AI agents?

Heffl has a Kin Score of 47.2 out of 100 (developing) and an Agent Readiness score of 50.7 (agent-ready), scored by API Evangelist on 2026-11-13.

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