Replay Lab
Failure replay, route comparison, and smallest-fix evidence.
Selected trace
trace_c2bbcf1f-55d8-419a-8bf6-30ca1bc24187
Original failed payment
trace_c2bbcf1f-55d8-419a-8bf6-30ca1bc24187
- Amount
- 1,000 CKB
- Failure time
- 18ms
- Sender
- fiber-rpc-node
- Receiver
- 0360779e54f1b2f380fe6889223ccf240c857bfebacd3c197a8d0124e9ab5d0484
ROUTE_CAPACITY_INSUFFICIENT
Route capacity insufficient
A route was discovered, but the available forwarding capacity was lower than the requested payment amount.
Failure Timeline
Lifecycle events captured in milliseconds.
- 0msrequest_receivedinfo
Live Fiber payment dry-run requested
- 12msnode_infosuccess
Connected to Fiber Network Node RPC
- 12mschannel_snapshotsuccess
Captured 1 live Fiber channels
- 12msgraph_snapshotsuccess
Captured live Fiber graph snapshot
- 18msfiber_rpc_errorerror
Send payment error: Failed to build route, Insufficient balance: max outbound liquidity 0 is insufficient, required amount: 1000
Generated Replay Scenarios
Selected from the failure fingerprint, not manually scripted in the UI.
Recommended fix
Smallest route-capacity fix
Replay showed the original 1000 CKB payment fails, 80% still fails, and 640 CKB succeeds. Split payment and exact outbound capacity repair also succeeded.
Split the payment into two 500 CKB parts, or reduce amount to 640 CKB.
If the operator controls liquidity, add at least 360 CKB outbound route capacity.
Original vs Replay
Original
Failed- Amount
- 1,000 CKB
- Latency
- 18ms
- Failed at
- fiber_rpc_error
Replay
success- What changed
- Split payment into 500 CKB + 500 CKB
- Latency
- 54ms
Replay Evidence
same_conditions
Original amount, route, peer state, fee limit, timeout, and asset unchanged
The original failure reproduces under the same conditions, confirming the fingerprint is stable.
reduced_amount_80
Reduced amount to 80%: 800 CKB
800 CKB still exceeds the constrained route capacity, so the payment fails again.
reduced_amount_64
Reduced amount to 64%: 640 CKB
640 CKB matches the observed maximum forwardable capacity and settles.
increased_outbound_capacity
Added exact outbound route capacity deficit: 360 CKB
Adding 360 CKB raises route capacity to the original payment amount and removes the constrained hop.
alternate_route
Selected alternate route excluding the failing condition
A route with different hops avoids the original failure point with slightly higher latency.
split_payment
Split payment into 500 CKB + 500 CKB
Splitting widens eligible paths and lowers per-route capacity pressure while preserving the original total amount.
Report Export
Export the failure timeline, replay evidence, recommendation, and mode disclosure.