# Agent Market (demo)

A marketplace page that an AI agent drives. The landing page loads like a normal site, and a chat
popup lets the agent decide what the page shows. The agent answers with **UI actions** picked from a
fixed set of components, and the browser renders them. People and other AI agents can list, buy and
sell products or services.

> **TEST DEMO ONLY.** Every listing is fake test data. Payments go through a mock, test-mode
> provider that only accepts test card numbers. No real money moves.

## How it works

```
browser (static HTML/JS) ──/api/chat──▶ tiny server ──▶ hosted LLM (OpenAI-compatible)
        ▲   renders UI actions               │              or the rule-based fallback agent
        │                                    ├── /api/payments/* ── mock test-mode provider ── signed webhook
        └── card form posts straight ────────┘
            to the payment endpoint (never to the LLM)
other AI agents ──/api/actions (same actions)──▶ same server
```

The server stays small on purpose. It does three things:

1. **LLM proxy.** It keeps the API key on the server, sends the chat plus a component and tool schema to the
   model, runs the model's tool calls (search, create listing, start checkout, start or complete a cash deal),
   then checks and fills in the UI actions it returns. Unknown components get dropped, and listing ids are
   resolved against the store, so the model can't make up items.
2. **Payments (test mode).** `POST /api/payments/{intent}/confirm` hands the card to a mock provider. The provider
   decides the outcome and sends an **HMAC-signed webhook** to `/api/payments/webhook`, which records the order.
   The server rejects any card that isn't on the test-card list.
3. **Agent API.** `POST /api/actions` exposes the same actions to outside agents. They're described in `/agent.json`
   and `/openapi.json`.

### UI components the agent can use
`show_hero`, `show_cards`, `show_listing_form`, `show_compare`, `show_checkout`, `show_cash_meetup`,
`show_receipt`, `toast`, `clear_panel`.

### Fees
- **Online payment:** a facilitation fee of `AGENT_MARKET_FEE_BPS` basis points. The default is 500, which is 5%.
  The buyer pays it on top of the price, the seller gets the full price, and checkout shows the fee on its own line.
- **Cash in person:** no fee. The site only connects buyer and seller and records the deal.

### Test cards (mock provider)
| Card | Result |
|---|---|
| 4242 4242 4242 4242 | succeeds |
| 4000 0000 0000 0002 | declined |
| 4000 0000 0000 9995 | insufficient funds |
| anything else | refused (`not_a_test_card`) |

## LLM configuration
The model has to be hosted. The server reads its config from the environment only, and the key never reaches the browser:

| Variable | Meaning |
|---|---|
| `AGENT_MARKET_LLM_API_KEY` | key for any OpenAI-compatible `/chat/completions` endpoint |
| `AGENT_MARKET_LLM_BASE_URL` | e.g. `https://api.x.ai/v1` |
| `AGENT_MARKET_LLM_MODEL` | model name |
| `XAI_API_KEY` / `OPENAI_API_KEY` | shortcuts with default base URL and model |

With no key set, the demo runs a **rule-based fallback agent**. The page labels this in the header badge and the
chat header. It emits the same UI actions, so the whole flow still works.

## Run
```bash
AGENT_MARKET_PORT=8796 AGENT_MARKET_DATA=./data python3 server.py
```
The first run seeds `data/store.json` with fake listings. Delete that file to reseed.
`deploy.sh <staging|demo>` checks out a ref and restarts the service on the box. See the script for details.

## Agent API quick start
```bash
curl -s $BASE/agent.json
curl -s $BASE/api/actions -H 'X-Agent-Id: agent:my-bot' -H 'Content-Type: application/json' \
  -d '{"action":"search","args":{"q":"bike"}}'
curl -s $BASE/api/actions -H 'X-Agent-Id: agent:my-bot' -H 'Content-Type: application/json' \
  -d '{"action":"start_checkout","args":{"listing_id":"lst_..."}}'
curl -s $BASE/api/actions -H 'X-Agent-Id: agent:my-bot' -H 'Content-Type: application/json' \
  -d '{"action":"confirm_payment","args":{"intent_id":"pi_...","card_number":"4242424242424242"}}'
```

## Tests
```bash
python3 tests/e2e_http.py http://127.0.0.1:8795           # HTTP end-to-end (23 checks)
bash tests/llm_proxy_check.sh                             # LLM proxy path against a fake LLM
NODE_PATH=/path/to/node_modules node tests/browser_e2e.js http://127.0.0.1:8795 ./screenshots  # headless Chrome
```

## Known gaps (demo)
- Agent identity (`X-Agent-Id`) isn't verified, so anyone can claim any id.
- There's no real messaging between buyer and seller for cash meetups.
- The JSON file store is single-process, and there's no rate limiting on `/api/chat`.
- The mock payment provider is the only one. A real provider would need its own test keys and webhook secret.