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ECAC: Caixa Postal, official-source lookup. Platform-hosted, pay per query with prepaid credit.
Streamable HTTP
https://api.mcp.ai/p_ecac_caixa_postalclaude mcp add --transport http ecac-caixa-postal-mcp https://api.mcp.ai/p_ecac_caixa_postalThis server publishes no installable package.