Prospectus Certification by Investment Company (Form 497J)

June 5, 2026 U.S. Securities and Exchange Commission Filing Desk 100 F Street, N.E. Washington, D.C. 20549 RE: ETF Opportunities Trust (the "Trust") (File Nos. 333-234544 and 811-23439)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, we hereby certify on behalf of the above registered management investment company, that the Prospectus and Statement of Additional Information that would have been filed under Rule 497(c) do not differ from that contained in the update to the Registration Statement on Form N-1A which was filed with the Commission on May 29, 2026 (Accession No. 0001771146-26-001113) for the REX-OspreyTM ETH + Staking ETF, REX-OspreyTM SOL + Staking ETF and REX-OspreyTM DOGE ETF, each a portfolio series of the Trust.

If you have any questions concerning the foregoing, please contact the undersigned at (913) 660-0778 or [email protected].

Very truly yours,

/s/ John H. Lively

On behalf of Practus, LLP