Stripe-Backed Blockchain Tempo Starts Testnet; Kalshi, Mastercard, UBS Added as Partners

Tech Share Share this article Copy link X icon X (Twitter) LinkedIn Facebook Email Stripe-Backed Blockchain Tempo Starts Testnet; Kalshi, Mastercard, UBS Added as Partners Tempo, built by Stripe and Paradigm, has started testing payment-focused blockchain and has onboard a slew of institutional partners. By Krisztian Sandor , AI Boost | Edited by Stephen Alpher Dec 9, 2025, 3:49 p.m. (CoinDesk) What to know : Stripe and Paradigm’s Tempo blockchain has launched its public testnet for real-world payment testing. Kalshi, Klarna, Mastercard and UBS are among a wave of new institutional partners now involved in the project. Tempo aims to offer low-cost, fast-settlement infrastructure for global payments as stablecoin adoption is accelerating globally. Tempo, a payments-focused blockchain backed by Stripe and crypto investment firm Paradigm, has launched its public testnet, a key step in its effort in making stablecoin payments for mainstream use. Tempo has also unveiled a roster of new additions to the network’s partner group, including buy-now-pay-later firm Klarna, predictions market Kalshi, payments giant Mastercard and Swiss global bank UBS. They join a group of earlier design partners such as Deutsche Bank, Visa, Shopify, OpenAI and Nubank. STORY CONTINUES BELOW Don't miss another story. Subscribe to the The Protocol Newsletter today . See all newsletters Sign me up By signing up, you will receive emails about CoinDesk products and you agree to our terms of use and privacy policy . Initially introduced in September , Tempo is designed to handle high-volume financial transactions with low fees, instant finality and native support for stablecoins. With the testnet now being live, developers and corporate partners can begin experimenting with real-world payments on-chain. The move fits into the latest trend of building blockchains for stablecoin payments as adoption of digital dollar is soaring globally. Currently a $300 billion asset class, stablecoins are projected to become an integral part of cross-border payment rails with business-to-business (B2B), peer-to-peer (P2P) and card payments driving growth, a recent report by Keyrock and Bitso said. Tempo aims to solve common pain points in blockchain-based finance, like network congestion and volatile transaction fees. The network charges around one-tenth of a cent per transaction, payable in U.S. dollar-denominated stablecoins and eliminating the need for a volatile gas token. The news comes on the heels of Bridge, Stripe's stablecoin infrastructure firm, helping Klarna issue its own digital dollar next year. Read more: Why Circle and Stripe (And Many Others) Are Launching Their Own Blockchains Stripe Paradigm Stablecoin AI Disclaimer: Parts of this article were generated with the assistance from AI tools and reviewed by our editorial team to ensure accuracy and adherence to our standards . 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