OfferUp

OfferUp is a mobile-first local marketplace where people buy and sell items in their community across categories including electronics, vehicles, furniture, clothing, and collectibles. Founded in 2011 and headquartered in Bellevue, Washington, OfferUp reports more than 40 million active users and around 30 million transactions annually, and merged with letgo in 2020 to become one of the largest recommerce platforms in the United States. The company operates consumer iOS and Android apps and a website but does not publish a public developer program, partner API, or API documentation. This profile was surfaced as a venture-capital portfolio company (a16z, GGV Capital) and enriched with an identity and domain-security pass; no public API surface was found.

OfferUp is profiled on the APIs.io network. Tagged areas include Company, Marketplace, Recommerce, Classifieds, and E-Commerce.

OfferUp’s developer surface includes support, engineering blog, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

12.3/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyMarketplaceRecommerceClassifiedsE-CommerceConsumerLocal Commerce

Kin Score

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

Composite quality — 12.3/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 4.2 / 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/offerup: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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 3

The organization behind the API

Website

Website

About

About

Blog

Blog

Source (apis.yml)

aid: offerup
name: OfferUp
description: OfferUp is a mobile-first local marketplace where people buy and sell items in their community across categories
  including electronics, vehicles, furniture, clothing, and collectibles. Founded in 2011 and headquartered in Bellevue, Washington,
  OfferUp reports more than 40 million active users and around 30 million transactions annually, and merged with letgo in
  2020 to become one of the largest recommerce platforms in the United States. The company operates consumer iOS and Android
  apps and a website but does not publish a public developer program, partner API, or API documentation. This profile was
  surfaced as a venture-capital portfolio company (a16z, GGV Capital) and enriched with an identity and domain-security pass;
  no public API surface was found.
url: https://raw.githubusercontent.com/api-evangelist/offerup/refs/heads/main/apis.yml
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://offerup.com/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- ggv-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Marketplace
- Recommerce
- Classifieds
- E-Commerce
- Consumer
- Local Commerce
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://offerup.com/
- type: About
  url: https://about.offerup.com/
- type: Support
  url: https://help.offerup.com/hc/en-us
- type: Blog
  url: https://about.offerup.com/insights
- type: TermsOfService
  url: https://offerup.com/terms
- type: PrivacyPolicy
  url: https://offerup.com/privacy
- type: DomainSecurity
  url: security/offerup-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: minimal
  artifacts_added: 1
  pass: local-v1