api.hergertsynthora.com v1 onchain

https://api.hergertsynthora.com/v1/onchain

answers 402

SYNTHORA Onchain Primitives: multichain (Base/Ethereum/Polygon/Arbitrum/Optimism) transaction receipts, tx lookup, wallet nonce, contract/proxy (EIP-1967) detection, ENS resolution, ERC20 + native balances, contract introspection. Deterministic, Ed25519-signed. 0.001 USDC via x402 on Base. First 3 calls FREE per wallet — send header 'X-WALLET: 0x<your Base address>' (no payment); after that 0.001

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: v2 (declares x402Version 2)
Transport: PAYMENT-REQUIRED header
HTTP method: POST
Response latency: 316 ms
Payment options: 1 usable of 1
Last checked: 2026-08-15T14:26:44.670Z (1h ago)
Category: finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.hergertsynthora.com%2Fv1%2Fonchain"