# Earn.com

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

Earn.com was a cryptocurrency startup founded in 2013 as 21e6 and later known as 21 Inc and 21.co, backed by a16z and others, which raised over $116 million. It began as a Bitcoin mining venture selling the 21 Bitcoin Computer, then pivoted to a paid-messaging marketplace where senders paid recipients in cryptocurrency to read and reply to email. Coinbase acquired Earn.com in April 2018 for a reported $120 million, and co-founder Balaji Srinivasan became Coinbase's first Chief Technology Officer. The standalone Earn.com product was retired and the brand was folded into Coinbase Earn, the learn-and-earn program. As of July 2026 the earn.com domain issues a blanket HTTP 301 redirect for every path to https://www.coinbase.com/earn, and no developer, documentation, or API subdomain resolves. Earn.com therefore has no independent API surface; any remaining API capability lives under Coinbase.

## 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 | 18.4 |
| Developer Ergonomics | 26.2 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Payments**: 18.8 (matched via tags).

## Agent readiness — 12.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| 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

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## Security (2)

- **Earncom Authentication** — http/custom-signature · 2 schemes
- **Earncom Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Cryptocurrency, Bitcoin, Payments, Acquired, Defunct, Messaging

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