Keryx MCP server

Keryx 🏛️

Every time an AI uses a creator's work as a source, the creator gets paid — instantly.

🔗 Live: keryx.cc — free to try, no wallet, no sign-up  ·  🔎 public proof — code, adoption, RPC, settlement, cash-outs  ·  ▶️ npm run demo — the whole loop, real settlement, ~90s  ·  🤖 npx -y keryx-mcp@latest — plug Keryx into any MCP agent  ·  🧩 Fork the Arc primitives

The problem

The web's economics assume a human reader: you write, people visit, attention becomes ads, subscriptions, tips. AI agents broke that contract. They read everything and send back nothing — no click, no view, no cent. Every answer an assistant gives is built on someone's work, and that someone is invisible at the exact moment their work proves its value.

Keryx (κῆρυξ — herald) exists to fix that one moment. It makes citation itself the payment event: the instant an agent relies on your writing to answer a question, you are paid, proportional to how much you helped, settled sub-cent in USDC on Arc. No accounts, no invoices, no ad tech. A creator onboards by pasting an RSS URL. An agent pays because paying is cheaper than not knowing.

What Keryx is

Keryx is a citation-toll reading agent — an autonomous reader with a wallet, and the payment rail underneath it. Give it a question and a budget:

with a human-readable rationale for every choice.

1. It decomposes the question into sub-claims and discovers exact article candidates from free previews and the signed offer book.
2. It decides, per article version: buy / skip / cache — expected value vs effective price vs remaining budget,

stops early when it has enough.

1. It pays the x402 toll only for what it buys, checks sufficiency after each read, and

contribution, and settles a weighted USDC nanopayment to every creator it cited** — multi-author works split on-chain, 100% to creator wallets, 0% platform fee.

1. It synthesizes a grounded answer with inline citations, **weighs each source's real

The result is a working micro-economy: readers that pay by default, and writers that earn by being useful — not by being clicked.

An agent that genuinely decides

Most "payment agents" are scripts with a wallet. Keryx's differentiator is visible agency — the model reasons about money and shows its work, streamed live to the UI:

Shortened. The full README is on GitHub.