SHARK launches PayCall, per-call API payments for AI agents over HTTP 402

SHARK introduces PayCall, a system that lets AI agents pay per API call over HTTP 402 instead of a credit card, according to a launch post on X. The post says PayCall enforces a hard budget in code, issues signed receipts, and reaches the same accuracy at 54% of naive cost.

It is built on Muse Spark.

The post also says PayCall uses simulated money with a real payment mechanism, so the money itself is not real.