Earn.com

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.

Earn.com is profiled on the APIs.io network. Tagged areas include Company, Cryptocurrency, Bitcoin, Payments, and Acquired.

Earn.com’s developer surface includes CLI, changelog, authentication, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

16.0/100 emerging ▬ flat Agent 17/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

0 APIs

CompanyCryptocurrencyBitcoinPaymentsAcquiredDefunctMessaging

Kin Score

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

Composite quality — 16.0/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 4.8 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 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/earncom: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conventions

Conventions

ErrorCatalog

ErrorCatalog

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Successor

Successor

Source (apis.yml)

aid: earncom
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/earncom.png
name: Earn.com
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/earncom/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: acquired-no-api-surface
x-status: acquired
x-acquired-by: Coinbase
x-acquired-date: 2018-04
x-successor: https://www.coinbase.com/earn
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Cryptocurrency
- Bitcoin
- Payments
- Acquired
- Defunct
- Messaging
common:
- type: Website
  url: https://earn.com/
- type: Successor
  url: https://www.coinbase.com/earn
- type: DomainSecurity
  url: security/earncom-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/21dotco
- type: SourceCode
  url: https://github.com/21dotco/two1-python
- type: Packages
  url: packages/earncom-packages.yml
- type: SDKs
  url: packages/earncom-packages.yml
  name: two1 (Python) — archived
- type: CLI
  url: cli/earncom-cli.yml
  name: 21 CLI — archived
- type: ChangeLog
  url: changelog/earncom-changelog.yml
- type: Lifecycle
  url: lifecycle/earncom-lifecycle.yml
- type: Authentication
  url: authentication/earncom-authentication.yml
- type: Conventions
  url: conventions/earncom-conventions.yml
- type: ErrorCatalog
  url: errors/earncom-error-codes.yml
apis: []
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 9
  pass: local-v1
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io

Earn.com

Kin Score

Security Posture 2

Earncom Authentication

Earncom Domain Security

Resources