# Wintergreen x402 Trust Badge

> Wintergreen x402 Trust Badge is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status down (last checked 2026-10-25).

Returns a trust/verification badge for a given x402 endpoint URL, confirming its payment-gated API is legitimate and operational.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/trust/badge?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-trust-badge-a5b67088
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3M0DZQ7MT_I301_VLXUzj

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-trust-badge-a5b67088
```

Example prompt: Can you check if the x402 endpoint at https://example.com/api/v1/data has a valid Wintergreen trust badge before I send a USDC payment to it?

## When to prefer this

Choose this endpoint when an AI agent needs to verify the legitimacy of an x402 payment-gated API before committing USDC. It is specifically designed for the x402 protocol ecosystem and provides Wintergreen's P2D badge — use it instead of generic uptime checkers or domain validators when the trust question is specifically about x402 payment endpoint authenticity.

## Known failure modes

- Unverified or unknown URL returns no badge or a failed verification status
- Malformed URL input causes a 400 bad request
- Payment not included or EIP-712 signature invalid causes HTTP 402 with payment instructions
- Endpoint temporarily unavailable returns 5xx error
- URL for a non-x402 endpoint returns a negative or absent trust result

## 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 trust/verification badge object indicating whether the given x402 endpoint URL has been verified as legitimate and operational, potentially including a P2D badge status and endpoint verification score. The response schema is currently unspecified, suggesting a JSON object with trust status fields.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-trust-badge-a5b67088/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)