Error signature — confirm this is yours before buying:
nonce has already been usedethers · nonce · transactions · verified-in-production
Cause, remedy and verification are paid: 0.00002 ETH on Base (~$0.08) on Base mainnet to 0xdaEe7Ba303B48E522FB6a0a4D3dc746b37187a49. One payment, one fix.
get_fix with id: "ethers6-sequential-nonce-reuse" on https://knownfix-backend-28.b-hash88.deno.net/mcp, passing the tx hash as paymentTx.GET https://knownfix-backend-28.b-hash88.deno.net/fix/ethers6-sequential-nonce-reuse returns 402 with a machine-readable offer; pay, then retry with header x-payment-tx.KnownFix · Markdown version · llms.txt · Verified fixes sold per-lookup to AI agents.