Guideline

Guideline (now offered as "Gusto 401(k) powered by Guideline") is a retirement benefits provider that delivers full-service, low-cost 401(k) and IRA plans to small and mid-sized businesses, tightly integrated with payroll so employee deductions and employer contributions sync automatically. Through its SEC-registered investment adviser subsidiary it offers managed, low-cost index-fund portfolios, recordkeeping, compliance and plan administration. Guideline reports serving 40,000+ businesses and 700,000+ savers with $10B+ in assets under management. It exposes no public developer API; this profile captures its identity, security posture, and machine-readable surfaces (security.txt, llms.txt) for the API Evangelist network.

Guideline is profiled on the APIs.io network. Tagged areas include Company, Retirement, 401k, IRA, and Financial-Services.

Guideline’s developer surface includes support, engineering blog, signup flow, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

18.9/100 emerging ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Retirement 401k IRA Financial-Services Fintech Payroll Investing Wealth Management

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 18.9/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.4 / 20

Access Clarity 10.0 / 20

Operational Transparency 1.7 / 13

Contract Governance 0.0 / 12

Discoverability 5.7 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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.

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 github.com/api-evangelist/guideline: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 3

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

Guideline Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Guideline Vulnerability Disclosure

security.txt · contact published

SECURITY

Guideline Trust Center

SOC 2 Type II

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Security

Security

Compliance

Compliance

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: guideline
name: Guideline
description: Guideline (now offered as "Gusto 401(k) powered by Guideline") is a retirement benefits provider that delivers
  full-service, low-cost 401(k) and IRA plans to small and mid-sized businesses, tightly integrated with payroll so employee
  deductions and employer contributions sync automatically. Through its SEC-registered investment adviser subsidiary it offers
  managed, low-cost index-fund portfolios, recordkeeping, compliance and plan administration. Guideline reports serving 40,000+
  businesses and 700,000+ savers with $10B+ in assets under management. It exposes no public developer API; this profile captures
  its identity, security posture, and machine-readable surfaces (security.txt, llms.txt) for the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/guideline/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- felicis
- sv-angel
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
image: https://cms-assets.guideline.com/Sponsor_dash_014e7269b8/public
tags:
- Company
- Retirement
- 401k
- IRA
- Financial-Services
- Fintech
- Payroll
- Investing
- Wealth Management
tags_raw:
- Company
- Retirement
- 401(k)
- IRA
- Financial Services
- Fintech
- Payroll
- Investing
- Wealth Management
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://guideline.com
- type: Support
  url: https://help.guideline.com/en
- type: Blog
  url: https://www.guideline.com/education
- type: SignUp
  url: https://my.guideline.com/explore/get-started
- type: Login
  url: https://my.guideline.com/login
- type: PrivacyPolicy
  url: https://my.guideline.com/agreements/privacy
- type: TermsOfService
  url: https://my.guideline.com/agreements/tos
- type: GitHubOrganization
  url: https://github.com/Guideline
- type: Security
  url: https://www.guideline.com/security
- type: Compliance
  url: https://www.guideline.com/security
- type: TrustCenter
  url: security/guideline-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/guideline-vulnerability-disclosure.yml
- type: SecurityTxt
  url: well-known/guideline-security.txt
- type: WellKnown
  url: well-known/guideline-well-known.yml
- type: DomainSecurity
  url: security/guideline-domain-security.yml
- type: LLMsTxt
  url: llms/guideline-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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