# Earn

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

Earn.com (formerly 21 Inc / 21.co) was a cryptocurrency startup that let people earn Bitcoin by replying to paid messages and completing microtasks, effectively a paid-email and paid-task marketplace settled in crypto. Founded by Balaji Srinivasan and backed by DCVC among others, the company was acquired by Coinbase in April 2018 (Coinbase, ticker COIN) and folded into the Coinbase Earn product. The independent earn.com property no longer operates a standalone product or developer surface: earn.com now issues a 301 redirect to coinbase.com/earn, and earlier hosts such as 21.co and api.earn.com no longer resolve. This profile is retained in the API Evangelist network as an acquired-company record; there is no independent, first-party API, developer portal, or OpenAPI to enrich.

## Kin Score — 1.5 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 1.5).

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

Regulatory layer — **Payments**: 9.4 (matched via tags).

## 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)

- **Earn Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Cryptocurrency, Bitcoin, Payments, Acquired, Coinbase

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