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fear-greed.hergertsynthora.com service
https://fear-greed.hergertsynthora.com/service
answers 402
Real-time crypto Fear & Greed index (0-100) with classification and history. Market-sentiment signal for allocation agents. Free source, deterministic. $0.005 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base
- Pay to
- 0x10800a5a5B9d72251566EC651E862A8b4B427dE0
- Spec dialect
- v1 (declares x402Version 1)
- Transport
- JSON response body
- HTTP method
- POST
- Response latency
- 687 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-15T14:30:19.612Z (1h ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Ffear-greed.hergertsynthora.com%2Fservice"