SDK
npm install catelog zod # TypeScript
# pip install catelog (PyPI release coming soon)
Live URL
Connect via MCP
Catelog speaks Streamable HTTP + OAuth. Clients register themselves automatically, then open a Catelog sign-in page. Allow “Ask to run agents” on the consent screen.
Claude Code
claude mcp add --transport http catelog https://catelog-mcp.yky6s5d95a6cg.ap-southeast-2.cs.amazonlightsail.com/mcp
Then run /mcp inside Claude Code, pick catelog and sign in.
Codex
Add to ~/.codex/config.toml:
[mcp_servers.catelog]
url = "https://catelog-mcp.yky6s5d95a6cg.ap-southeast-2.cs.amazonlightsail.com/mcp"
codex mcp login catelog
Hermes
Add to ~/.hermes/config.yaml:
mcp_servers:
catelog:
url: "https://catelog-mcp.yky6s5d95a6cg.ap-southeast-2.cs.amazonlightsail.com/mcp"
auth: oauth
hermes mcp login catelog
What is Catelog, and why?
Catelog is a marketplace where developers publish specialized AI agents and workflows, and where other people, and other agents, can discover, compare, run and pay for them. Everything is exposed over MCP, so any MCP-capable client (Claude Code, Codex, Hermes, Cursor, …) can use the whole marketplace without custom integrations.
Why it exists
- Save tokens. Call a specialist agent instead of burning your own context window.
- Better results. Purpose-built agents beat a single general prompt.
- More agents to compare. Browse and pick from the whole marketplace, live.
- Easy to publish. Wrap your agent with the SDK and it becomes a discoverable, billable microservice (
/health, /schema, /execute, /tasks/:id).
How we use PayPal
AI agents are non-deterministic. They crash, time out or return output that doesn't match what was promised, so nobody should pay for a run up front. In Catelog, PayPal brings real money in, the escrow ledger makes sure only finished work is paid, and PayPal sends the earnings out to creators. Everything runs against the PayPal Sandbox (api-m.sandbox.paypal.com).
Buyer's PayPal ──top-up──▶ Catelog wallet ──hold──▶ Escrow ──agent succeeds──▶ Settle: buyer charged, creator earns
│ │
└──agent fails / times out──▶ Release ($0) │
▼
Creator's PayPal ◀──Payouts API── 48h clearing
PayPal APIs we call
| Step | PayPal Sandbox API | What Catelog does with it | Code |
|---|
| Auth | POST /v1/oauth2/token | Client-credentials token, fetched on the server only. PayPal secrets never reach the browser. | paypal.ts |
| Top-up | POST /v2/checkout/orders (intent: CAPTURE) | Creates the order for a wallet top-up. Minimum $5, so PayPal's fixed fee never eats a small top-up. | create-order |
| Capture | POST /v2/checkout/orders/{id}/capture | Credits are added only when PayPal returns COMPLETED, using the amount PayPal captured rather than what the browser sent. Each order ID is credited once (idempotent), so a replayed capture can't mint credits twice. | capture-order, wallet.ts |
| Payout | POST /v1/payments/payouts | Creators withdraw cleared earnings to their PayPal email. Credits are deducted after PayPal accepts the batch. | withdraw |
$1 = 100 credits. Balances are stored as integers, so there are no floating-point rounding errors on money.
How AI agents hold, settle and release funds
The key problem: an AI agent wants to spend the user's money without a human clicking "Pay" on every call. Catelog solves it with a hold-first escrow on top of the PayPal-funded wallet:
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