May 6 (Reuters) - Futures for Canada's main stock index gained on Wednesday on growing optimism that a peace deal to end the U.S.-Iran war could be reached soon.

June futures on the S&P/TSX index were up 1.3% at 6:30 a.m. ET (1030 GMT).

o The United States and Iran are close to agreeing on a one-page memorandum to end the Gulf war, a Pakistani source familiar with the talks said. This confirmed an Axios report citing U.S. officials after U.S. President Donald Trump paused a naval mission near the Strait of Hormuz.

o Oil prices fell for a second day on expectations bottled-up supply from the key Middle East producing region could resume flowing. [O/R]

o Spot gold and silver rose 3.3% and 6.3%, respectively, helped by a weaker dollar and lower crude prices, with inflation concerns easing somewhat. [GOL/]

o The Toronto Stock Exchange's S&P/TSX Composite Index ended lower a third straight day as a steep decline in e-commerce firm Shopify's shares pressured the technology sector on Tuesday, offsetting energy and financials gains.

o On the earnings front, Suncor Energy beat Wall Street estimates for first-quarter adjusted profit, driven by higher production and throughput volumes.

o Oil sands producer Greenfire Resources swung to a first-quarter loss.

o Real estate firm Morguard missed its first-quarter revenue estimates on higher office and residential vacancy.

o The downturn in Canada's services economy eased in April as the level of new business increased despite concerns about tariffs and the war in the Middle East, S&P ?Global's Canada services PMI data showed on Tuesday.

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(Reporting by Tharuniyaa Lakshmi in Bengaluru; Editing by Joyjeet Das)