Austin Griffith

The problem: Ethereum mainnet takes ~12 seconds per block, and for real finality you're looking at ~15 minutes (2 epochs). For a pay-per-API-call protocol like x402, that's terrible. The server needs to know the payment landed before releasing data. You can't make an agent wait 12+ seconds for an API response, let alone 15 minutes. That's why Coinbase's facilitator only supports Base (which has ~2 second blocks and fast soft confirmations). Preconfirmations: Block proposers (validators) make a cryptographic commitment before the block is finalized that they will include your transaction. It's basically a validator saying "I guarantee this tx will be in my block" — and they have economic stake backing that promise. If they break it, they get slashed. What Primev did: Their facilitator submits the transferWithAuthorization tx through their FastRPC infrastructure, which gets a preconfirmation from the upcoming block proposer in ~100-200ms. The facilitator can then tell the server "payment is committed" with high confidence — the validator's stake is on the line. End-to-end, the agent gets their data back in ~1.2 seconds. So it's not that finality itself got faster on mainnet. It's that the facilitator accepts a preconfirmation (an economically-backed promise of inclusion) as "good enough" to release the data, rather than waiting for actual block confirmation. For a $0.01 API call, a validator risking their 32 ETH stake is more than sufficient security.

👨‍🎤 cypherpunk activated

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