Keryx
Commerce at machine speed.
The toll booth for the agent economy.
Pitch deck · v0.1 · July 2026
team@keryxhq.xyz · keryxhq.xyz
01The world we're leaving
Every API on the internet was built for humans.
Identity
Assumed to be durable.
Every SaaS has an accounts table. Agents spun up for one call don't have long-lived identities worth registering.
Payment
Assumed to be recurring.
Card processing costs more than a single API call. So vendors bundle a month at a time. That math breaks below one cent.
Access
Assumed to be pre-provisioned.
A human hardcodes a key into an env file. An agent that discovers a new capability mid-task cannot pause to fill a signup form.
None of this is a hard technical problem — just defaults that stopped making sense the moment the caller became a program.
02The world we're entering
The caller is changing.
When your caller is an autonomous AI agent that lives for thirty seconds to answer one question, all three assumptions collapse.
03Enter
Keryx is a paid tool registry for AI agents.
- Any developer publishes an HTTP endpoint at a price, points it at an Arc wallet, and it's live in a minute. No accounts.
- Any AI agent — Cursor, Claude, GitHub Copilot, custom — discovers it via MCP and pays per call in USDC on Circle Arc.
- Works in Cursor, Claude (connectors), GitHub Copilot, and any MCP client. One-line config.
- The unit of access is the call, not the account. Publisher is payTo onchain (100% of the call today); 5% platform fee is ledger accounting until split settlement. No listing fee, no minimum. Paste address supported for preview (sign to publish).
- Every payment settles onchain in under half a second. Every settlement has a real Arcscan tx hash.
- Not "pay for things that are free on the web". Keryx is the payment + discovery layer for capabilities agents are willing to pay for — today public data with reliability, tomorrow paid creator tools and proprietary sources.
Provably live
Contract0x7eA36cC743EDF162fd7BF3704BD55c56A1998bA7
ChainArc testnet (5042002)
Tools listed20 seeded + published (executable)
Onchain anchor5 · KeryxRegistry.sol
Off-chain registry14 · publisher-owned
Facilitator0x8F47…26B6
Sitekeryxhq.xyz
04How it works
Four steps. One HTTP request.
1
Publish
Wrap any HTTP handler with a middleware. Set a price. Point it at your Arc wallet. Sign an EIP-191 message to prove ownership.
2
Discover
Agents hit
GET /api/tools or drop the Keryx MCP server into Claude Code's config. Every listing carries its price and arg schema.3
Pay-per-call
The agent's first request returns HTTP 402 with a machine-readable price. It signs an EIP-3009 USDC authorization and retries.
4
Settle
Keryx verifies the signature, executes the tool, broadcasts the USDC transfer onchain. Real tx hash lands on the public ledger.
One call. One payment. One Arc transaction. Ninety-five percent to the publisher.
05Under the hood
The stack, top to bottom.
AI agent
Claude Code · Cursor · custom
MCP
Native tool discovery in three lines of config
x402 protocol
HTTP 402 + signed X-PAYMENT retry
Keryx registry
Offchain listings + onchain KeryxRegistry.sol
USDC on Arc
Sub-cent settlements, USDC-native gas, <2s finality
Every layer is real and shipping. The x402 endpoint returns real 402s. The MCP server responds to real JSON-RPC. The registry contract holds real onchain state.
06What's live today
Not aspirational. Shipped.
20
Seeded tools (executable end-to-end)
5
Anchored onchain in KeryxRegistry.sol
4
Live surfaces (site, /api/call, /api/mcp, /ask)
∞
Public tx hashes on Arcscan — verify any of them
Hybrid model on purpose. Five tools are anchored onchain in KeryxRegistry.sol at 0x7eA3…8bA7 as canonical, permissionless discovery. The rest live in the off-chain registry so publishers can iterate (price changes, arg schema updates) in a wallet-signed message instead of a gas-paying transaction. Every listed tool is executable today; the onchain anchor is opt-in.
07Competitive landscape
Nobody's shipped this exact shape yet.
| Keryx | RapidAPI | Exa · Tavily | Skyfire | Anthropic MCP dir | |
|---|---|---|---|---|---|
| Registry of many tools | ✓ | ✓ | — | — | ✓ |
| Agent-callable without signup | ✓ | — | — | ✓ | partial |
| MCP-native discovery | ✓ | — | — | — | ✓ |
| Onchain USDC settlement | ✓ | — | — | ✓ | — |
| Sub-cent pricing viable | ✓ | — | — | partial | — |
| Publisher gets paid per call | ✓ | ✓ (via card) | N/A | N/A | — |
Exa, Tavily, Firecrawl, Helius, DexScreener — every single-product API on this table could list on Keryx. We're a different layer of the stack.
08Why Circle Arc, specifically
Sub-cent pricing collapses on every other rail.
Stripe minimum
$0.30 + 2.9%
A $0.005 call becomes a $0.31 call.
Ethereum L1 gas
~$0.50 – $2.00
More gas than call. Impossible math.
Base / Optimism
~$0.001 – $0.005
Better, but a $0.005 tool still costs more in gas than in revenue.
Circle Arc
Native USDC gas · ~$0.0001 per tx
This is the only chain in Keryx's price band.
Arc is USDC as native gas with sub-half-second finality. It's the reason the whole business model is possible.
09The moat
Three flywheels stacked.
MCP-native discovery
Every Claude Code user is one config edit away from every tool we host. That distribution surface only grows.
Wallet-native payments
No accounts, no keys, no signup. The one thing every agent framework already gives an agent is a wallet.
Registry network effects
Every publisher adds a reason for agents to be on Keryx. Every agent adds a reason for publishers to list. Standard marketplace lock-in, but tuned for machines.
10Roadmap
What's shipped, what's next, what's after.
Now
- KeryxRegistry.sol on Arc testnet
- Seeded executable tools + public registry (Solana, weather, finance, geo, search, crypto, utilities…)
- Real x402 path: wallet agents pay via /quickstart.ts → Arc USDC
- POST /api/receipt/verify — R5 Arc eth_getTransactionReceipt proofs
- MCP server — Cursor, Claude, GitHub Copilot, Codex + any MCP client
- Public ledger (/live) with Arcscan hashes · local facilitator settles
Next 30 days
- Growing seeded catalog + explicit handler contract for publishers
- Circle Gateway credentials → onchain batched settlement
- First 20 verified publishers
- OpenAPI spec + Node + Python SDKs
- Get listed in Anthropic MCP directory
Q1 2027
- Arc mainnet migration
- Fiat on-ramp for humans who want to pre-fund
- Publisher reputation + revenue analytics
- Cross-chain settlement (via Circle Gateway)
- Enterprise self-host for regulated deployments
11What we're asking for
Distribution, credentials, and the first fifty publishers.
Circle
Gateway credentials so we flip the default facilitator from local to Gateway-batched. Blog post feature as a reference implementation of the Agent Stack.
Anthropic
Listing in the MCP directory when it launches. Priority Claude API rate limits under the Claude Startups program so /ask can scale.
Publishers
Any operator of a real API — search, crypto data, RPC, scraping — should list a tool. Verified first-50 slots free. team@keryxhq.xyz · @keryxhq.
Keryx
Commerce at machine speed.
Site keryxhq.xyz
Contact team@keryxhq.xyz
Contract 0x7eA36cC743EDF162fd7BF3704BD55c56A1998bA7
X @keryxhq
Not backed by Ycmobinator.
MIT · Settles on Arc testnet.