Run deterministic Fiber payment attempts without a live node.
Baseline CKB transfer with route discovery, fee quote, HTLC lock, settlement, and receipt.
No viable path exists between sender and receiver within current topology.
A path exists, but available outbound capacity cannot carry the payment amount.
The route depends on a peer that cannot be reached during payment execution.
A required channel is announced but unavailable for forwarding.
The receiver or route does not support the requested asset.
The available route requires a higher fee ceiling than the request allows.
The payment exceeds the allowed execution window before final settlement.
Channels are live, but liquidity sits on the wrong side for this direction.
The first path failed and no policy-compliant retry path was available.