ubn_tw_validate $0.001 per call

Offline validator for a Taiwan Unified Business Number (統一編號, 8-digit business ID). Normalizes input to 8 digits, multiplies each by weights [1,2,1,2,1,2,4,1], sums the digits of each product (splitting two-digit products), and if the 7th digit is '7' also tests sum+1; accepts if any candidate sum is divisible by 10 (old numbers) or 5 (new-format numbers from ~2023).

For AI agents: call ubn_tw_validate
POST https://toll402.dev/v1/t/ubn_tw_validate
{
 "value": "12345633"
}
Answers 402 with x402 payment requirements; pay with any x402 client (@x402/fetch, x402 for Python, toll402-client, toll402-mcp) or send a prepaid-credits key as x-toll402-key (https://toll402.dev/credits). Paid per call via x402 (USDC on Base) or with a prepaid-credits key (x-toll402-key, card at /credits); charged only on success. Start at /llms.txt or connect the MCP server: npx -y toll402-mcp · remote https://toll402.dev/mcp.

Input schema

{
 "type": "object",
 "properties": {
  "value": {
   "type": "string",
   "description": "8-digit Taiwan UBN, digits only (spaces/dashes allowed)"
  }
 },
 "required": [
  "value"
 ],
 "additionalProperties": false
}

MCP

{"mcpServers":{"toll402":{"command":"npx","args":["-y","toll402-mcp"],"env":{"TOLL402_WALLET_KEY":"0x..."}}}}

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