Exa AI launches on Solana, enabling agents to access web and content search using USDC payments via x402 without accounts, API keys, or subscriptions

75.41M x402 transactions and $24.24M of 30-day volume gives Solana a live API-metering rail to fight for, not a cold spec. CDP’s facilitator docs list Solana beside Base, Polygon, Arbitrum, and World, with 1,000 free transactions per month and $0.001 per transaction after that. The risk is concurrency: May 2026 x402 papers found replay, weak context binding, and paid-but-denied failure modes, exactly the stuff autonomous search agents will hit first.

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