Battle-tested, commercially-licensed building blocks for the hard parts - AI agents, payments, auth, observability, supply chain. No new paradigm to learn; they're just more http4k.
Automatic build-time verification of http4k artifact signatures, SBOMs, SLSA provenance, and license reports
See more →OpenTelemetry trace capture and HTML test reports with Wiretap Intercept, plus real-time traffic monitoring, chaos engineering, and MCP debugging with Wiretap Console
See more →Build MCP servers and MCP Apps to integrate Large Language Models with your data and tools
See more →Build interoperable AI agent systems with Google's A2A protocol - Agent Cards, Tasks, Streaming, and Push Notification
See more →Passwordless authentication with FIDO2 passkeys - full WebAuthn registration and authentication ceremonies, pluggable verification and storage
See more →Scalable machine-to-machine payment infrastructure for automated digital commerce between services
See more →HTTP 402-based payment protocol enabling machine-to-machine commerce with automatic micropayment negotiation
See more →Hot Reload restarts your server the moment your code changes - no more manual restarts
See more →Turn http4k tests into living visual stories - HTTP exchanges, WebDriver interactions, SQL queries, and author narration captured as navigable slideshows or scrollable pages
Coming soon →A robust transactional outbox implementation for http4k that ensures reliable message delivery with database consistency.
Coming soon →Secure & audited API Gateway for developers and MCP tools to connect to your OpenAPI-powered services
Coming soon →MCP, Agent2Agent, Wiretap and X402 payments - the full toolkit for building and debugging agentic systems.
Explore the pack →X402 and the Machine Payments Protocol - automated micropayment negotiation between your services.
Explore the pack →Every Pro module ships under the http4k Commercial License - free for individuals, non-profits and qualifying small businesses.
Individuals, non-profits and businesses under $1M revenue. Add the dependency and start using every Pro module today - no sign-up, no licence key.
Start buildingCommercial teams over $1M revenue. Pick the modules you need - priced per module, per floating developer seat, billed yearly.
Choose your modules →The only way to get every Pro module in one go - bundled with LTS, priority support, source access and supply-chain provenance. Best value past a few modules.
Explore Enterprise →Custom licensing
We offer custom licensing terms to suit your organisation's needs, with volume discounts and support package customisations available for your team's requirements.
