x402-agent-store

# x402 Agent Store — pay-per-call data tools for AI agents

**No API keys. No accounts. No subscriptions.** Your agent calls a tool, pays a few cents in USDC over the [x402 protocol](https://www.x402.org), and gets live data back. That's it.

Works in **Claude Desktop, Cursor, and any MCP client**. Also discoverable by autonomous agents on the [Coinbase x402 Bazaar](https://docs.cdp.coinbase.com/x402/bazaar).

> **The one thing nobody else sells:** *Does ChatGPT / Perplexity / Google AI actually recommend your brand (or token) when buyers ask?* We turn that into a number an agent can buy.

## 🟢 Free: get your AI-visibility badge

A live badge showing whether AI recommends a brand — drop it in any README, site, or deck:

[![AI Visibility](https://store.agentexchange.work/badge?brand=Cursor&category=AI+code+editors)](https://store.agentexchange.work/studio)

Make your own in 5 seconds at the **[AI Visibility Studio](https://store.agentexchange.work/studio)** — type your brand, copy the embed snippet. Free, no signup. Every badge is powered live by the store; the full audit is one `/brands/check` call away.

---

## Install (one step)

**Claude Desktop** → Settings → Connectors → Add custom connector:
```
https://store.agentexchange.work/mcp
```

**Cursor** → add to `.cursor/mcp.json`:
```json
{
  "mcpServers": {
    "x402-agent-store": { "url": "https://store.agentexchange.work/mcp" }
  }
}
```

**Any MCP client (stdio bridge):**
```
npx mcp-remote https://store.agentexchange.work/mcp
```

Free discovery first — no payment needed to look:
- Catalog: https://store.agentexchange.work/
- Free samples of every product: https://store.agentexchange.work/samples
- MCP manifest: https://store.agentexchange.work/.well-known/mcp.json

---

## What your agent can call

| Tool | Price | What it returns |
|---|---|---|
| `brand_ai_visibility_check` | $0.95 | Live audit: does AI recommend this brand? Score 0–100, mention rate, who AI names instead |
| `crypto_ai_visibility` | $0.05 | Same, for a crypto token/protocol/chain — an AI-narrative signal for traders |
| `prediction_market_odds` | $0.01 | Live Polymarket odds: implied probabilities, 24h volume, liquidity; search by keyword |
| `sales_qualify_lead` | $0.95 | Qualify a prospect by its AI-visibility gap: HOT/WARM/COLD + outreach opener |
| `ai_visibility_index` | $0.005 | AI-visibility scores for 25 major brands across 5 industries |
| `defi_vs_riskfree_spread` | $0.005 | Top stablecoin DeFi yields vs the US T-bill rate, with a verdict |
| `defi_yields` | $0.003 | Top DeFi pools by chain/TVL (live, DefiLlama) |
| `us_treasury_rates` | $0.002 | Official US Treasury rates + total public debt |
| `crypto_prices` | $0.001 | Token prices by CoinGecko id |
| `github_trending` / `npm_downloads` / `hn_top_stories` | $0.001 | Developer-intel feeds |
| `truck_load_profit` / `truck_cost_per_mile` | $0.001 | Freight economics |

Free tools: `store_catalog`, `store_samples`, plus an agent-to-agent task market (`market_*`).

---

## How paying works (x402, in 3 lines)

1. Your agent calls a paid tool. It gets back HTTP **402** with exact payment requirements (price, recipient, network).
2. It signs an **EIP-3009 USDC** authorization on **Base** (eip155:8453).
3. It retries with the signed payload. Data comes back. No account, no key, no invoice.

Most MCP/x402 clients (e.g. `@x402/mcp`, `@x402/fetch`) handle this loop automatically — you just call the tool.

### Minimal quickstart
See [`examples/quickstart.mjs`](examples/quickstart.mjs) for a ~20-line agent that discovers a tool and completes a paid call.

---

## Why this exists

The agent economy runs on machine-to-machine micropayments. Agents need data they can buy *without* a human signing up for an API plan. This store is built for that: every tool is one call, priced in cents, settled per request. The flagship product — **AI visibility** — is data that doesn't exist anywhere else in agent-callable form: a measurement of whether large language models recommend a given brand or token to the people asking them for advice.

- Live store: https://store.agentexchange.work
- On the x402 Bazaar / Agentic.Market (Coinbase discovery layer)
- Verifiable usage: https://www.x402scan.com/server/a2a5649b-73d6-477f-933c-2d4a96943ca1

## License
MIT — see [LICENSE](LICENSE).