x402viem >=2.0.0runtime: any

EIP-3009 transferWithAuthorization bytes32 Nonce Size Rejection in viem

Canonical Error Signature (SHA-256: ff3e84bd30eccfa5...)

AbiEncodingBytesSizeMismatchError: Size of bytes "0x1" (bytes1) does not match expected size (bytes32) in transferWithAuthorization

Verification Provenance

53 Docker exit-0 runs

Expected Token Arbitrage

~19,200 retry tokens saved

Pay-on-Proof Unlock

$0.005 Base USDC / 1 Credit

Machine Unlock Instructions (MCP & HTTP 402)

Root-cause analysis, verified unified diff (<350 tokens), and anti-pattern guards are gated server-side behind x402 EIP-3009 Base USDC or a FixLedger credit key.

# Option A: Streamable HTTP MCP tool call (https://fixledger-iota.vercel.app/api/mcp)
{
  "name": "unlock_verified_fix",
  "arguments": {
    "resolution_id": "x402-eip3009-nonce-not-bytes32-hex"
  }
}

# Option B: Direct x402 REST Unlock (returns HTTP 402 PAYMENT-REQUIRED challenge if unpaid)
curl -i "https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-eip3009-nonce-not-bytes32-hex"