# Wintergreen x402 Oral Board Prep Guide

> Wintergreen x402 Oral Board Prep Guide is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Delivers a payment-gated firefighter oral board preparation guide for AI agents via x402 micropayment protocol

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/knowledge/oral-board-prep
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-oral-board-prep-guide-5c248523
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kqMozH5rkLwk1kLSee72n

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 wintergreen-x402-oral-board-prep-guide-5c248523
```

Example prompt: Can you get me the firefighter oral board prep guide from Wintergreen — I have a fire department interview coming up and want coaching on what to expect and how to answer panel questions?

## When to prefer this

Choose this endpoint when an AI agent needs structured, on-demand career guidance specifically for firefighter oral board interview preparation and the user is willing to pay a $2.50 USDC micropayment per retrieval. Prefer over free web searches when a curated, expert-authored guide is needed rather than scattered forum advice. Suitable for agents that already support the x402 payment protocol on Base.

## Known failure modes

- HTTP 402 returned if payment header is missing or malformed — agent must sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header
- Invalid or expired payment signature causes rejection
- Incorrect USDC amount (must be exactly 2.5 USDC) causes payment failure
- Wrong chain (must be Base eip155:8453) causes payment failure
- Empty or missing _slug parameter may return wrong or no content
- Network timeout if Base chain is congested during payment verification

## How this service works

Payment-gated crypto trading intelligence for AI agents.
    
## Categories
- **Hyperliquid Signals**: Real-time funding divergence, lead-lag correlation, liquidation clusters, session volume area levels
- **Quant Methodology**: Backtesting walk-forward validation, strategy generation with kill battery (19 rules), risk management with Kelly sizing, regime detection, execution frameworks, agent orchestration
- **Market Insights**: 22 crypto microstructure observations — funding, liquidation, orderbook, regime, flow, anomaly
- **Power Markets**: ERCOT field guide, merit-order model, duck curve analysis
- **Career Guides**: Firefighter oral board prep, medical coding, ATSA, contractor estimating
- **Trust Scoring**: x402 endpoint verification, P2D badges

## Payment
All paid endpoints return HTTP 402 with USDC on Base (eip155:8453). 
Sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header.
PayTo: 0xAe9834d71F1Bd989A0dc17593451af823E31CeeD

## Output

A structured knowledge article covering firefighter oral board preparation, including likely panel questions, answer frameworks, scoring criteria, and practical tips for candidates approaching a fire department hiring interview. Returned as text content after successful USDC micropayment on Base.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "_meta": {
   "type": "string"
  },
  "_slug": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-oral-board-prep-guide-5c248523/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.wintergreen.uk](https://www.zero.xyz/host/x402.wintergreen.uk/llms.txt)