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Sponge is a financial technology company developing payment infrastructure for the artificial intelligence agent economy, operating from an unspecified headquarters location. The platform provides digital wallets that enable autonomous AI agents to hold funds and execute transactions using bank accounts, credit cards, and cryptocurrency. Additionally, the B2B software allows traditional businesses to onboard and accept payments directly from these automated systems without requiring human intervention or complex code modifications. Backed by Silicon Valley startup accelerator Y Combinator as part of its Winter 2026 batch, the early-stage enterprise currently operates with a small team of three employees. The infrastructure specifically facilitates agent-driven purchases of digital services such as premium data access, browser usage, and automated email capabilities. The exact founding year and the identities of the company's founders have not been publicly disclosed at this time.