# APEX Faucet — X402 Top Sellers Leaderboard

> APEX Faucet — X402 Top Sellers Leaderboard is a paid API for AI agents from apexfaucet.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Returns a ranked leaderboard of the top sellers on the X402 marketplace, sorted by buyer count and call volume, with up to 50 results.

## Facts

- Endpoint: GET https://apexfaucet.xyz/api/x402/x402-top-sellers?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apex-faucet-x402-top-sellers-leaderboard-fdd520c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wBbKrX2-dpefjvl6DdQxt

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability apex-faucet-x402-top-sellers-leaderboard-fdd520c3
```

Example prompt: Pull the top 25 sellers from the X402 marketplace leaderboard so I can see which vendors have the most returning buyers and highest call volumes.

## When to prefer this

Use this endpoint when you need a ranked, quantitative view of the X402 seller ecosystem — specifically when comparing sellers by buyer retention (returning buyers), call volume, or listing strength. Prefer this over general web searches when you need structured, up-to-date marketplace data with numeric metrics rather than subjective reviews.

## Known failure modes

- limit parameter out of range (must be 1-50) returns validation error
- Payment failure or insufficient USDC balance prevents access
- Stale data if the leaderboard index hasn't been recently updated
- Empty or partial results if fewer sellers exist than requested limit
- Network timeout on large limit values

## How this service works

Free APEX on X1, and free USDC plus APEX on Arc, three times a day. No gas, no sign-up. Plus a swap, a screener, APEX City and token checks.

## Output

A JSON object with ok: true, a data object containing a ranked array of sellers (each with rank, domain, total calls, listing count, price data, calls per payer, returning buyers floor, and strongest listing URL), plus metadata like listingsRead, sellersWithReturningBuyers, and a howToRead explanation string. Also includes paid: 0.01 indicating the USDC cost charged.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 50,
       "minimum": 1,
       "description": "How many sellers to return (1-50, default 25)."
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "data": {
    "type": "object"
   },
   "paid": {
    "type": "number"
   }
  }
 },
 "example": {
  "ok": true,
  "data": {
   "ok": true,
   "readAt": "2026-10-09T17:24:10.841Z",
   "sellers": [
    {
     "rank": 1,
     "seller": "www.ax1.vc",
     "itsCalls": 392794,
     "listings": 1,
     "networks": {},
     "priceUsd": {},
     "callsSummed": 392794,
     "payersSummed": 4710,
     "callsPerPayer": 83.4,
     "strongestListing": "https://www.ax1.vc/api/dashboard/q-verdict/resource",
     "returningBuyersFloor": 4710,
     "listingsWithReturningBuyers": 1
    }
   ],
   "howToRead": "returningBuyersFloor is the payer count of the seller's strongest listing whose …",
   "listingsRead": 35125,
   "sellersWithReturningBuyers": 499
  },
  "paid": 0.01
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/apex-faucet-x402-top-sellers-leaderboard-fdd520c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from apexfaucet.xyz](https://www.zero.xyz/host/apexfaucet.xyz/llms.txt)