Guideline website screenshot

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, 401(k), IRA, and Financial Services.

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

🌐 Visit website 📡 Source on GitHub
20.1/100 emerging ▬ flat Agent 7/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyRetirement401(k)IRAFinancial ServicesFintechPayrollInvestingWealth Management

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 20.1/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.3 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 2.1 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 7/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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 4 / 4
Consent & Bot Identity 3 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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
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)

apis.yml Raw ↑ 
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
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
image: https://cms-assets.guideline.com/Sponsor_dash_014e7269b8/public
tags:
- 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