invoice_no_jp_validate $0.001 per call

Offline validator for a Japanese Invoice Registration Number (適格請求書発行事業者登録番号): format is 'T' followed by the 13-digit Corporate Number. Strips/uppercases the 'T' prefix, then validates the embedded Corporate Number using its check-digit algorithm: for the 12-digit base (digits 2-13, left to right), sum digit*2 at odd positions and digit*1 at even positions, checkDigit = 9 - (sum mod 9), which must equal the first digit.

For AI agents: call invoice_no_jp_validate
POST https://toll402.dev/v1/t/invoice_no_jp_validate
{
 "value": "T7000012050002"
}
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": "Invoice registration number, e.g. T7000012050002"
  }
 },
 "required": [
  "value"
 ]
}

MCP

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

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