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.
- 9 min read
How we ship x402 endpoints without confusing discovery with demand
An evidence-led release checklist for x402 catalogs, Coinbase Bazaar, APINow, agent skills, MCP directories, indexing, and real buyer-demand gates.
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- 7 min read
When to move from pay-per-call to Agent Ops
A practical threshold model for deciding when AI agent traffic should stay on x402 pay-per-call versus switching to Agent Ops subscription plans.
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- 8 min read
LLM math failure modes in deal workflows
Five recurring numerical failure modes we see in agent-led finance workflows, and how deterministic endpoint calls prevent expensive downstream errors.
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- 7 min read
MCP payments with policy guardrails in one loop
How to combine MCP tool calls, x402 settlement, and payment-policy checks so autonomous agents can buy API calls without blowing risk budgets.
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- 6 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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