U.CASH library

Learn it, then look it up

The library catalogs the network's learning surface: guides that teach, references that specify, archives that remember. Every card links its canonical home, so what you read is always the live version.

3 shelves 15 entries · all linked to source

Guides

Long-form, learn-it-by-doing material: payments, shops, invoicing, operations.

Payment guides

Learn

Checkouts, payment links, payouts, invoicing and test mode, end to end.

Open

Long-form learn hub

Learn

Deep walkthroughs across payments, shops, invoicing and operations.

Open

Getting started with agents

Learn

From API key to a priced resource an agent can pay for.

Open

SDK quickstarts

Learn

JavaScript and Python from install to first payment, plus the MCP server.

Open

References

The specs and machine-readable surfaces: point tooling here.

Agents API reference

Specs

The REST surface for priced resources, wallets, challenges and settlements.

Open

OpenAPI 3.1 spec

Specs

Structured machine spec for tooling and SDK generation.

Open

llms.txt

Specs

The entire agents surface in one plain-text file, for LLMs.

Open

The 402 protocol

Specs

The vendor-neutral 402 spec and the UCP discovery profile.

Open

ENS and name resolution

Specs

On-chain name lookup and the resolver tool.

Open

Fleet status API

Specs

Live fleet health and uptime history.

Open

Archives

History and current-state records: what shipped, when, and where it lives.

The build stream

Records

The network building itself, live: fleet git activity as it happens.

Open

The app catalog

Records

Every app on the network with its lifecycle stage and changelog.

Open

The formal canon

Records

Economy, technology and protocol papers, dated and sourced.

Open

Brand assets

Records

Logos, icons and token swatches for builders.

Open

Network statistics

Records

The public fleet dashboard: price, uptime and doors.

Open