# x402 Trust & Discovery API — Leaderboard

> x402 Trust & Discovery API — Leaderboard is a paid API for AI agents from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us, paid per call via x402, $0.02/call, status down (last checked 2026-10-03).

Returns a ranked leaderboard of top x402/MPP endpoints or sellers by revenue, call volume, or unique payers on Base

## Facts

- Endpoint: GET https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/leaderboard?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trust-discovery-api-leaderboard-a15d3969
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5YhsrGb67i28eiVJZhlmh

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 x402-trust-discovery-api-leaderboard-a15d3969
```

Example prompt: Show me the top 10 x402 endpoints ranked by revenue so I can see which APIs are earning the most in the micropayment ecosystem.

## When to prefer this

Use this endpoint when you need a ranked overview of the x402/MPP ecosystem — e.g. to discover high-traffic or high-revenue endpoints, identify top sellers, or benchmark a specific API against the market. Prefer this over the /v1/guard endpoint when you want aggregate market intelligence rather than a safety check on a specific URL.

## Known failure modes

- Invalid 'by' value (not revenue/calls/payers) — likely returns 400 or empty result
- Invalid 'of' value (not endpoints/sellers) — likely returns 400
- limit out of range (>50 or <1) — may return 400 or clamp to bounds
- No data available yet — returns empty array
- Service unavailable — non-2xx response

## How this service works

Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for "is this API endpoint a scam" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.

## Output

A ranked JSON list of up to 50 endpoints or sellers, ordered by the chosen metric (revenue, calls, or payers), showing onchain-derived statistics aggregated from Base settlement history.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "by": {
   "type": "string",
   "description": "Rank by revenue, calls or payers."
  },
  "of": {
   "type": "string",
   "description": "endpoints or sellers."
  },
  "limit": {
   "type": "integer",
   "description": "Maximum rows, 1-50."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trust-discovery-api-leaderboard-a15d3969/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us](https://www.zero.xyz/host/gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/llms.txt)