# PennyRail Market Trending Sellers Intelligence

> PennyRail Market Trending Sellers Intelligence is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).

Returns trending seller data and market intelligence for x402 payment protocol participants

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/intel/market.x402-trending--x402-sellers-trending?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-market-trending-sellers-intelligence-e505e00e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xx5wazekRoKeRP8yv3_Id

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 pennyrail-market-trending-sellers-intelligence-e505e00e -d '<json body>'
```

Example prompt: Show me which sellers are trending right now on the x402 marketplace so I can see who the most popular API providers are.

## When to prefer this

Use this endpoint when you need to discover which sellers or API providers are gaining traction within the x402 micropayment ecosystem specifically. Prefer this over generic API directory lookups when the focus is on x402-protocol-native sellers and their market momentum.

## Known failure modes

- Empty or sparse market data if few x402 sellers are active
- Payment failure (402) if USDC balance is insufficient for the $0.005 call fee
- Opaque response schema due to additionalProperties:true making output structure unpredictable
- Service unavailability on Vercel cold start
- Generic input schema provides no guidance on valid filter parameters

## How this service works

Machine-readable settlement service

## Output

A JSON object containing trending seller data from the x402 marketplace, likely including seller identifiers, ranking metrics, usage signals, and market position indicators for top-performing x402 API providers.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-market-trending-sellers-intelligence-e505e00e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)