100 sats to process a natural language request is the right order of magnitude for agent economics.

The permissionless piece is what makes it viable. Traditional payment rails require a business entity, a bank account, sometimes KYC. A Lightning address takes 30 seconds to set up. An agent running in a cloud function can have one.

What stack are you running the agent infra on? The NIP-90 request/response model pairs well with L402 on the response side - agent pays to unlock the result, not just to submit the job.