Function saveX402PrivateKey

src/services/x402/config.ts:121–141

(privateKeyHex: string)

 * file permissions (600).
 */
export function saveX402PrivateKey(privateKeyHex: string): string {
  const keyHex = privateKeyHex.startsWith('0x')
    ? privateKeyHex.slice(2)
    : privateKeyHex

  if (keyHex.length !== 64 || !/^[0-9a-fA-F]+$/.test(keyHex)) {
    throw new Error('Invalid private key: must be 32 bytes (64 hex characters)')
  }

  const address = deriveAddress(keyHex)

  saveGlobalConfig((config) => ({
    ...config,
    x402PrivateKey: `0x${keyHex}`,
  }))

  saveX402Config({ address })

  logForDebugging(`[x402] Wallet configured: ${address}`)
  return address
}

/** Removes the private key and disables x402 */
export function removeX402PrivateKey(): void {