checkout51

Checkout 51 is a consumer cash-back rewards service, delivered as a free mobile app and website, that lets shoppers earn money back on everyday grocery and gas purchases. Members browse weekly offers, buy participating brands at any store, then upload a photo of their receipt to claim cash back; balances are paid out by check once they reach a $20 threshold. The company earns revenue from partner brands that fund the offers. It was added to the API Evangelist network as a Slow Ventures portfolio company; it operates a consumer app plus a partner/brands program, but publishes no public developer API, SDKs, or specifications at this time.

checkout51 is profiled on the APIs.io network. Tagged areas include Company, Cash Back, Rewards, Grocery, and Retail.

checkout51’s developer surface includes support, getting-started guide, signup flow, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

16.6/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyCash BackRewardsGroceryRetailLoyaltyConsumer AppReceipts

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 16.6/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.0 / 20

Commercial Clarity 6.8 / 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/checkout51: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Login

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: checkout51
name: checkout51
description: Checkout 51 is a consumer cash-back rewards service, delivered as a free mobile app and website, that lets shoppers
  earn money back on everyday grocery and gas purchases. Members browse weekly offers, buy participating brands at any store,
  then upload a photo of their receipt to claim cash back; balances are paid out by check once they reach a $20 threshold.
  The company earns revenue from partner brands that fund the offers. It was added to the API Evangelist network as a Slow
  Ventures portfolio company; it operates a consumer app plus a partner/brands program, but publishes no public developer
  API, SDKs, or specifications at this time.
url: https://raw.githubusercontent.com/api-evangelist/checkout51/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- slow-ventures
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: '2026-07-18'
image: https://www.checkout51.com/shared/assets/img/themes/reskin/favicon.ico
tags:
- Company
- Cash Back
- Rewards
- Grocery
- Retail
- Loyalty
- Consumer App
- Receipts
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/checkout51-domain-security.yml
- type: Website
  url: https://www.checkout51.com
- type: Support
  url: https://support.checkout51.com/hc/en-us
- type: GettingStarted
  url: https://www.checkout51.com/how-it-works
- type: SignUp
  url: https://www.checkout51.com/account/signup
- type: Login
  url: https://www.checkout51.com/account/login
- type: TermsOfService
  url: https://www.checkout51.com/terms
- type: PrivacyPolicy
  url: https://www.checkout51.com/privacy
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence