Next pending nonce for an address via eth_getTransactionCount (pending). Deterministic, Ed25519-signed. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure. $0.002 USDC via x402 on Base. SYNTHORA.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.002000 USDC | 0x1080...7dE0 |