npm
prosopo/captcha
Open-source, frictionless CAPTCHA and bot defense. A privacy-focused alternative to reCAPTCHA and hCaptcha.
Apache-2.0Sep 14, 2026 · metrics 2.10.0
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Catalogue tag
#proof-of-work
Every repository in the public record carrying this tag — from its GitHub topics or the keywords its package registries publish. Health is measured under the same versioned methodology as the rest of the record.
12 records
npm
tiagozip/cap
Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges.
Custom licenseSep 15, 2026 · metrics 2.10.0
npm
MikeyPetrillo/Agent402
agent402.tools: 500+ pay-per-call tools, metered models and finished reports for AI agents, paid per call in USDC over x402 and MPP or by card. Open source, self-hostable, MCP-native. The applied layer of agentic finance.
AGPL-3.0Sep 9, 2026 · metrics 2.10.0
npm · Go
PrivateCaptcha/PrivateCaptcha
Independent, privacy-first, self-hostable PoW CAPTCHA service made in EU
Custom licenseSep 8, 2026 · metrics 2.10.0
npm
altcha-org/altcha
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.
MITSep 8, 2026 · metrics 2.10.0
npm · Go
FriendlyCaptcha/friendly-captcha-sdk
The SDK that is used to integrate Friendly Captcha v2 into your website. Protect your websites and online services from spam and abuse with Friendly Captcha, the privacy-first anti-bot solution.
MPL-2.0Sep 28, 2026 · metrics 2.10.0
npm · Go · PyPI
WebDecoy/FCaptcha
Self-hosted, invisible CAPTCHA that detects AI agents driving real browsers. GDPR, WCAG 2.2 AA, and EAA: no cookies, no third-party data sharing, and no visual or audio puzzle. With a false-positive budget enforced in CI. Proof of work, drop-in for Turnstile and reCAPTCHA.
MITSep 10, 2026 · metrics 2.10.0
Go · npm
Upellift99/GateCHA
Self-hosted ALTCHA CAPTCHA management server with API keys, multi-site support, and statistics dashboard. Open-source alternative to ALTCHA Sentinel.
MITSep 20, 2026 · metrics 2.10.0
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animicaorg/all
Animica — post-quantum (ML-DSA-65) proof-of-work Layer-1 blockchain by Alexander Lehman: Python smart contracts, ANM-native L2 rollup, mining pool, free OpenAI-compatible AI API, x402 pay-per-call agent APIs, MCP server. Monorepo, Apache-2.0.
Apache-2.0Sep 17, 2026 · metrics 2.10.0
npm
valve-tech/msgboard
MsgBoard — proof-of-work message board: SDK, core, Hardhat plugin, Foundry library, faucet, UI
No licenseSep 16, 2026 · metrics 2.10.0
Packagist · npm
bbysaeth/typo3-altcha
TYPO3 form element for spam protection by utilizing the proof-of-work mechanism Altcha.
GPL-2.0Sep 14, 2026 · metrics 2.10.0
Go · npm · PyPI
krutftw/bitcoin09
Discontinued proof-of-work experiment. Source and releases retained as a historical archive.
MITSep 11, 2026 · metrics 2.10.0