Tarfio sells a budget and metering layer between agents and paid MCP tools.

Tarfio posted to Show HN September 13: MCP creators set a dollar price per successful tool call, with monthly bundles listed as coming; agent teams set a total budget, a spending limit and a maximum price per call before a run starts. Payments are conditional on a completed logical call, with receipts deduplicating retries so a flapping tool can't bill repeatedly. Private beta, no real payment details taken, no rates or revenue share published, so the model is the finding and not the economics. Retry deduplication being a first-class concept is the design detail that suggests someone has actually been billed by a flapping tool.