Notes from building Hermes Plant

Technical posts on agent payments, the x402 protocol, MCP, and deterministic finance APIs — grounded in the endpoints we ship and the bugs we fix. New post every two weeks.

June 28, 20266 min read
x402 from curl: the smallest possible agent transaction
What a 402 Payment Required response actually looks like, how an agent signs the EIP-712 payment authorization, and what comes back. Two curl commands and one signed authorization — that's the whole flow.
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