CNPJAPI

CNPJ Lookup for Marketplaces

A marketplace lives on the trust between buyers and sellers. Accepting sellers with inconsistent data or an irregular company leads to fraud, chargebacks, and tax problems. CNPJAPI validates and fills in seller records by CNPJ, with official Receita Federal data.

The problem

  • Sellers registered with a company name or address that diverges from the CNPJ.
  • Merchants with irregular registration status operating on the platform.
  • Slow onboarding due to manual data entry.

How the API solves it

During seller registration, the marketplace looks up the CNPJ and gets the data ready to use:

  • Company name and trade name to confirm the seller's identity
  • Registration status to block closed or unfit companies
  • Business activity (CNAE) to check whether the segment fits the platform
  • Address and legal nature

One call per CNPJ, JSON response. See the field dictionary and the integration guides.

Where to start

  1. Generate your API key at https://app.cnpjapi.com.br (see Authentication).
  2. During seller onboarding, trigger the lookup by CNPJ and fill in the registration.
  3. Use registration status as an automatic approval rule.

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