nip_pl_validate $0.001 per call

Offline validator for a Polish NIP (Numer Identyfikacji Podatkowej) tax identifier. Normalizes input (strips dashes/spaces), checks it is 10 digits, and verifies the checksum digit using weights 6,5,7,2,3,4,5,6,7 applied to the first 9 digits with mod-11 (checksum of 10 is invalid).

For AI agents: call nip_pl_validate
POST https://toll402.dev/v1/t/nip_pl_validate
{
 "nip": "123-456-32-18"
}
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": {
  "nip": {
   "type": "string",
   "description": "Polish NIP, digits with optional dashes/spaces"
  }
 },
 "required": [
  "nip"
 ],
 "additionalProperties": false
}

MCP

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

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