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Plugin splicein aborts due to high fee #9105

@hMsats

Description

@hMsats

Version: v26.04.1-8-g30a6b4c (latest splicein)

Executing:

lightning-cli -splicein 00e8fa5f98228486a276abaa8e970d3b8433ff8afc7950f78973e5ead9078124 50000

outputs:

2026-05-03T15:25:02.164Z INFO    plugin-spenderp: setting needed_funds to 50000sat
2026-05-03T15:25:02.567Z INFO    plugin-spenderp: Splice fee is 1256sat at 1255 perkw (5.02 sat/vB) on tx where our weight units are 1001
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: handle_wallet_fund needed_funds 51256sat, current_funds 0sat, missing_funds 51256sat
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: Requesting funding amount + 1256sat fee wallet inputs for 51256sat with 0sat already_funded
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: Splice fee is 1308sat at 1255 perkw (5.02 sat/vB) on tx where our weight units are 1043 
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: handle_wallet_fund needed_funds 51308sat, current_funds 51256sat, missing_funds 52sat
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: Taking 52sat from output wallet 36818sat to cover fee
2026-05-03T15:25:02.568Z INFO    plugin-spenderp: Wallet funding done
2026-05-03T15:25:02.833Z INFO    031979fe6ce0e69ece6d99a4bc4a7b30ed22a8cb8703dd7dd2dfaf619e07127e0b-channeld-chan#3: We are initiating tx_abort for reason: Our own fee (1308sat) is too high to use without forcing. Splice feerate 1255 x weight 1044 / 1000 = 264sat (max)
2026-05-03T15:25:03.070Z INFO    031979fe6ce0e69ece6d99a4bc4a7b30ed22a8cb8703dd7dd2dfaf619e07127e0b-channeld-chan#3: We got TX_ABORT ack, now telling master about it    
2026-05-03T15:25:03.070Z UNUSUAL 031979fe6ce0e69ece6d99a4bc4a7b30ed22a8cb8703dd7dd2dfaf619e07127e0b-lightningd: Splice aborted Our own fee (1308sat) is too high to use without forcing. Splice feerate 1255 x weight 1044 / 1000 = 264sat (max)

While:
lightning-cli feerates perkb

outputs:

{
   "perkb": {
      "opening": 1012,
      "mutual_close": 1012,
      "unilateral_close": 1012,
      "unilateral_anchor_close": 5000,
      "penalty": 1012,
      "splice": 5020,
      "min_acceptable": 1012,
      "max_acceptable": 11160,
      "floor": 1012,
      "estimates": [
         {
            "blockcount": 2,
            "feerate": 1116,
            "smoothed_feerate": 1116
         },
         {
            "blockcount": 6,
            "feerate": 1012,
            "smoothed_feerate": 1012
         },
         {
            "blockcount": 12,
            "feerate": 1012,
            "smoothed_feerate": 1012
         },
         {
            "blockcount": 100,
            "feerate": 1012,
            "smoothed_feerate": 1012
         }
      ]
   },
   "onchain_fee_estimates": {
      "opening_channel_satoshis": 177,
      "mutual_close_satoshis": 170,
      "unilateral_close_satoshis": 1390,
      "unilateral_close_nonanchor_satoshis": 151,
      "htlc_timeout_satoshis": 167,
      "htlc_success_satoshis": 177
   }
}

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