# OfferUp

**Canonical:** https://apis.io/providers/offerup/  
**Website:** https://offerup.com/  
**APIs profiled:** 0

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.

## Kin Score — 10.6 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 10.6).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Offerup Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Company, Marketplace, Recommerce, Classifieds, E-Commerce, Consumer, Local Commerce

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/offerup/). Scores are computed from the provider's own public artifacts under a published rubric.