Flex website screenshot

Flex

Flex is a consumer financial technology company that lets renters pay their monthly rent in smaller installments spread across the month, instead of a single lump sum on the due date, so payments better fit each person's pay schedule and cash flow. The company pays the landlord or property manager in full on the due date and collects from the renter over the month, positioning itself as a flexible-payments layer on top of the largest recurring expense most households carry. Founded in 2019 and headquartered in New York City, Flex operates a consumer mobile app and partners with property-management platforms; it is backed by Lightspeed Venture Partners and surfaced in the 500 Global portfolio. Flex publishes no public developer API, developer portal, or discovery surface today - this profile is a network lead.

Flex is profiled on the APIs.io network. Tagged areas include Company, FinTech, Financial Services, Payments, and Rent Payments.

🌐 Visit website 📡 Source on GitHub
7.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyFinTechFinancial ServicesPaymentsRent PaymentsConsumer FinanceBill PayReal Estate

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 7.7/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · 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 0 / 4
Consent & Bot Identity 0 / 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/flex: 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 1

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

Flex Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: flex
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flex.png
name: Flex
description: Flex is a consumer financial technology company that lets renters pay their monthly rent in smaller installments
  spread across the month, instead of a single lump sum on the due date, so payments better fit each person's pay schedule
  and cash flow. The company pays the landlord or property manager in full on the due date and collects from the renter over
  the month, positioning itself as a flexible-payments layer on top of the largest recurring expense most households carry.
  Founded in 2019 and headquartered in New York City, Flex operates a consumer mobile app and partners with property-management
  platforms; it is backed by Lightspeed Venture Partners and surfaced in the 500 Global portfolio. Flex publishes no public
  developer API, developer portal, or discovery surface today - this profile is a network lead.
url: https://raw.githubusercontent.com/api-evangelist/flex/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- FinTech
- Financial Services
- Payments
- Rent Payments
- Consumer Finance
- Bill Pay
- Real Estate
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/flex-domain-security.yml
- type: Website
  url: https://flexfinance.ai
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence