# POST /marketplace/feature: $1 per call

For sellers listed on the Aayat marketplace: feature your approved x402 API or MCP server for one more day per call ($1 a day). It shows in a clearly labelled 'Sponsored' slot next to matching router answers; the organic ranking itself never changes. Give your listing id.

- **Price:** $1 in USDC, the same on Base, Solana, Polygon, Arbitrum. Failed calls are never charged.
- **Free trial:** no, paid only (it uses a paid AI model or data source, or costs more than the trial covers). Other ways to pay: x402 or [prepaid credits](/credits).
- **Answers cached for:** not cached
- **Data sources:** our marketplace
- **Lane:** x402 market guide ([OpenAPI](/openapi/x402-guide.json))
- **Live health:** [status page](/status)

## Free sample

See an answer for the demo input first, free (no payment, 10 a minute): [https://aayatai.com/sample/marketplace-feature](/sample/marketplace-feature). It is a stored real answer when we have one, otherwise an example marked `"kind": "illustrative"`.

```bash
curl "https://aayatai.com/sample/marketplace-feature"
```

## 1. See the price (free)

Call it without paying: you get `402 Payment Required` and a `PAYMENT-REQUIRED` header with the exact price and where to pay.

```bash
curl -i -X POST https://aayatai.com/marketplace/feature -H "content-type: application/json" -d '{"listing":"0123456789ab"}'
```

## 2. Pay and call (TypeScript)

```bash
npm install @x402/fetch @x402/evm viem
```

```ts
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// A wallet used only by your agent, holding a little USDC on Base.
const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://aayatai.com/marketplace/feature", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"listing":"0123456789ab"}),
});
console.log(await res.json());
```

## 3. Or as an MCP tool

```ts
// MCP server: https://aayatai.com/mcp (Streamable HTTP). With the x402 MCP client (see /start):
const result = await client.callTool("marketplace-feature", {"listing":"0123456789ab"});
```

## Inputs

- `listing` **(required)** (string): Your listing id (shown on your seller page, /marketplace/listing/<id>).

Bad inputs are rejected with HTTP 400 before any payment is asked for.

## Example answer

Example only: the shape of an answer, with placeholder addresses and made-up figures. It is not data about any real token or wallet; call the service (or its free sample) for real results.

```json
{
  "listing": "0123456789ab",
  "name": "Example SMS API",
  "page": "https://aayatai.com/marketplace/listing/0123456789ab",
  "featuredUntil": "2026-09-30T12:00:00.000Z",
  "badge": "none"
}
```

## Related

- [GET /tools/find](/services/find-best-tool) ($0.002): Find the best tool for a job.
- [GET /x402/find](/services/x402-find) ($0.002): Describe a job in plain English, such as 'scrape a web page to markdown', and get the best working x402 services for it, ranked on fit, real buyers (30 days), o
- [GET /x402/find/live](/services/x402-find-live) ($0.01): Like /x402/find, but the shortlist is re-checked right now: we send each top candidate one unpaid request and keep only those answering with a valid x402 price 
- [GET /x402/check](/services/x402-check) ($0.002): Live health check of any x402 endpoint before you pay it: is it up and answering 402, is the payment request valid, prices in USD per network, pay-to wallets, x
- [GET /x402/recommend](/services/x402-recommend) ($0.03): Describe a job and get the best x402 services to do it: we search the whole Bazaar catalogue, then an AI compares the candidates on real buyer numbers, recent u
- [GET /x402/trends](/services/x402-trends) ($0.01): What's growing in the x402 economy: services with the biggest rise in unique buyers over the last N days, from our own daily history of the Bazaar catalogue (hi
- [POST /marketplace/badge](/services/marketplace-badge) ($1): For sellers listed on the Aayat marketplace: request the 'Verified by Aayat' badge for your approved listing.

New here? [Getting started in 60 seconds](/start). All services: [Aayat AI](/).