Nigeria promotes transparency and accountability in its export sector through:

1. Automation of processes: The Nigeria Customs Service (NCS) has automated its processes, reducing human interference and increasing transparency.

2. Single Window Platform: The NCS has implemented a Single Window Platform, which enables all trade-related agencies to work together, reducing duplication and increasing transparency.

3. Trade Portal: The Nigerian Trade Portal provides information on trade policies, regulations, and procedures, increasing transparency and ease of doing business.

4. Export Certification: The Nigerian Export Promotion Council (NEPC) issues certificates of origin, ensuring compliance with international standards and regulations.

5. Regular Audits: The NEPC and NCS conduct regular audits to ensure compliance with regulations and detect fraud.

6. Whistleblower Policy: The Nigerian government has established a whistleblower policy, encouraging reporting of corrupt practices.

7. Anti-Corruption Agencies: Agencies like the Economic and Financial Crimes Commission (EFCC) and Independent Corrupt Practices and Other Related Offences Commission (ICPC) investigate and prosecute corrupt practices.

8. Transparency in Export Data: The National Bureau of Statistics (NBS) publishes regular trade data, providing accurate information on Nigeria's export sector.

These measures aim to increase transparency, accountability, and ease of doing business in Nigeria's export sector.