Paid liveness probe for the MimirAPI counter. Returns pong, the SKU id, and a server timestamp. One tenth of a cent buys a complete challenge, sign, settle, serve round trip — the cheapest possible proof that your x402 client wiring works before you spend real money on real SKUs.

Live crypto/token spot price in USD, routed to the best live x402 provider and returned normalized. Pass ?symbol=BTC (or ETH, WIF, a coin name) and optional ?vs=USD. One integration, always-live: the router weighs providers for liveness and price and buys on your behalf, so you never chase a dead endpoint or manage six provider accounts. Returns the price, its as-of time, the upstream source, and a confidence signal.