# Wintergreen x402 Weather Calibration

> Wintergreen x402 Weather Calibration is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status down (last checked 2026-10-13).

Returns weather calibration data for a given station, gated behind a $0.05 USDC micropayment via x402 protocol on Base.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/quant/weather-calibration?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-weather-calibration-e16458af
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LcHjDHswQdUyWkLOlxrXK

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-weather-calibration-e16458af
```

Example prompt: Can you pull the weather calibration data for station 'KDAL' from Wintergreen's x402 endpoint — I need the calibrated metrics for that station?

## When to prefer this

Use this endpoint when you need weather calibration data for a specific station and are operating in an x402 micropayment-enabled agent environment with USDC on Base. Particularly suited for power market modeling (ERCOT), duck curve analysis, or quant models that require calibrated weather inputs. Prefer this over general weather APIs when you need calibration-specific outputs rather than raw forecasts or observations.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — agent must sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header
- Invalid or unknown station identifier may return an error or empty response
- USDC balance insufficient on Base (eip155:8453) prevents successful payment
- Payment to wrong address (not 0xAe9834d71F1Bd989A0dc17593451af823E31CeeD) results in failed authorization
- Undefined response schema means output structure may be unpredictable or sparse

## 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

Returns weather calibration metrics for the specified station, likely including calibrated atmospheric or temperature parameters used for energy market or quantitative modeling. The response schema is not formally defined, so the exact fields may vary by station.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "station": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-weather-calibration-e16458af/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)