# Brük

> Brük (brukledger.com) portrays the public XRP Ledger as art: a live, five-act visual instrument built on real ledger data, and two films: "A Flight Through the Ledger" and "A Flight Through an Answer" by Rob Baer, MD. Brük also runs a paid API for AI agents with verified XRP Ledger answers.

## For AI agents

- [Brük Agent API guide](https://bruk-agent-api.fly.dev/llms.txt): services, prices, inputs, and free samples.
- Paid per call with x402: USDC on Base, or XRP or RLUSD on the XRP Ledger. No account or API key.
- Every answer includes proof (ledger index, validation status, sources) and a list of what is not known. Bad input and ledger outages are never charged.
- Services: payment check, pre-send check, issuer check, ledger pulse, large payments, payment arrival alerts.
- [OpenAPI](https://bruk-agent-api.fly.dev/openapi.json) · [x402 discovery](https://bruk-agent-api.fly.dev/.well-known/x402)
- [Weighmaster results](https://x402-seal-proto.fly.dev/results): handshake record for XRP Ledger-paid AI services. Read https://x402-seal-proto.fly.dev/llms.txt before summarizing it.

## Learn

- [A Flight Through an Answer](https://brukledger.com/answer): a 20:50 narrated film by Rob Baer, MD, on how an AI assistant turns a question into an answer: training, tokens, the order of instructions (platform, developer, user; web pages and tool results are information, not orders), search and tools, citing sources, testing, and why answers vary. Told through Iowa/Illinois tallgrass prairie, a brook, eastern and prairie birds, and natural (uncut) crystals. Chapters: 00:00 The Question, 01:43 The Long Apprenticeship, 04:14 Words Become Pieces, 06:38 The Small Door, 08:38 Rules of the Road, 11:15 The Interchange, 12:49 Sources Come Home, 14:40 The Proving Ground, 16:21 Three Doors, 17:54 The View Widens.
- [Full transcript of A Flight Through an Answer](https://brukledger.com/assets/answer-transcript.txt) (plain text, with sources and birdsong credits). Credit line: Brük, A Flight Through an Answer, by Rob Baer, MD, brukledger.com/answer
- [A Flight Through the Ledger](https://brukledger.com/film): a short film from a single address to the whole ledger. Chapters: 00:00 The Address, 00:49 The Account, 01:42 The Transaction, 03:02 The Lift.
- [Transcript](https://brukledger.com/assets/film-transcript.txt) · [Captions](https://brukledger.com/assets/film-captions.vtt)
- Credit line: Brük, A Flight Through the Ledger, brukledger.com/film

## Notes

- Brük shows public, on-chain data for information and entertainment. It is independent and not affiliated with Ripple Labs or the XRP Ledger Foundation. Nothing here is financial advice.