x402.o8.is is a lightweight gateway for buying Swarm upload tokens on the Base network — pay USDC to get time-limited upload tokens for decentralized file hosting. It offers a single /prepare endpoint that mints upload tokens with fixed durations and prices (1 day = $0.04, 7 days = $0.25, 14 days = $0.50). This provider is well suited to ephemeral or small-scale decentralized file hosting workflows and simple dApp integrations.