Transaction costs

Sizes and execution budgets for Hydra protocol transactions. Note that unlisted parameters are currently using arbitrary values and results are not fully deterministic and comparable to previous runs.

Metadata
Generated at	2026-10-29 14:27:14.464734014 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νHead	72a18a0a0325b4bd994246601c5feecb4a68781a6bc8bddc245a08a6	10427
μHead	c20d4ac31518d382654e2bcfea30c3340fa734cf59b80d4e4ae46767*	3555
νDeposit	85653fecc2d185c67b90ad223021df0c5c170f20b91628c09e42be83	1861
νCRS	74be3f1cceed792db9fcb21101f8cfb61876853b8e61f5057cf7fc6d	1515

• The minting policy hash is only usable for comparison. As the script is parameterized, the actual script is unique per head.

Init transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4059	5.65	1.41	0.39
2	4153	5.90	1.47	0.40
3	4253	6.56	1.64	0.41
5	4445	7.20	1.80	0.42
10	4924	9.27	2.33	0.46
50	8766	25.80	6.52	0.80
100	13564	46.97	11.88	1.22
125	15964	57.39	14.52	1.43

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	2599	12.90	4.15	0.56
2	2732	14.08	5.18	0.58
3	2863	14.49	5.97	0.60
5	3129	15.73	7.69	0.63
10	3780	19.65	12.25	0.73
50	9021	50.21	48.24	1.46
75	12298	69.16	70.74	1.92

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	678	11.35	3.68	0.46
2	811	12.03	4.56	0.48
3	937	12.72	5.44	0.49
5	1201	14.10	7.20	0.53
10	1858	17.49	11.60	0.62
50	7098	47.12	47.31	1.35
75	10372	64.73	69.39	1.79

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
3	969	12.00	10.47	0.53
5	1228	13.34	12.22	0.56
50	7124	45.67	52.16	1.37
75	10399	64.13	74.47	1.82

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	734	13.04	11.44	0.53
2	866	13.84	12.35	0.55
3	997	14.62	13.25	0.57
5	1260	16.15	15.06	0.61
10	1915	20.13	19.61	0.70
50	7151	53.83	56.38	1.47
75	10431	74.97	79.40	1.95

FanOut transaction costs

Involves spending head output and burning head tokens. Uses ada-only UTXO for better comparability. Rows first grow the UTxO set at a fixed 10 parties, then show the largest set that still fits per number of parties (burning more participation tokens leaves less room for outputs).

Parties	UTxO	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
10	0	0	4228	15.41	39.08	0.93
10	1	57	4263	16.92	41.21	0.96
10	5	285	4398	23.73	49.95	1.08
10	10	568	4567	33.43	61.26	1.25
10	20	1138	4906	57.38	85.29	1.63
1	20	1140	4630	52.67	84.13	1.57
5	20	1139	4753	54.76	84.64	1.60
10	20	1140	4909	57.38	85.29	1.63
20	20	1137	5215	63.01	86.67	1.70
50	20	1139	6148	79.93	90.81	1.91

PartialFanOut transaction costs

Largest chunk of ada-only outputs that can be distributed in one partial fanout step, computed dynamically. The last row is the maximum total UTxO count where at least one output can still be distributed.

Total UTxO	Distributed	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
11	10	568	985	24.54	61.73	1.02
25	24	1368	1465	54.29	94.55	1.52
30	26	1482	1533	59.49	99.53	1.60
40	26	1481	1532	59.49	99.53	1.60
50	26	1476	1527	59.49	99.53	1.60
100	26	1480	1531	59.49	99.53	1.60
150	26	1479	1530	59.49	99.53	1.60
200	26	1480	1527	59.49	99.53	1.60
200	26	1481	1532	59.49	99.53	1.60

PartialFanOut transaction costs (with native tokens)

Largest chunk of native-token outputs that can be distributed in one partial fanout step, computed dynamically. The last row is the maximum total UTxO count where at least one output can still be distributed.

Total UTxO	Distributed	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
11	10	1200	1697	29.90	63.54	1.11
25	24	2616	2810	66.55	98.66	1.71
30	24	2568	2760	66.53	98.65	1.70
40	24	2304	2485	66.55	98.59	1.69
50	24	2712	2911	66.55	98.71	1.71
100	24	2448	2636	66.55	98.65	1.70
150	24	2760	2961	66.55	98.71	1.71
200	24	2568	2757	66.55	98.66	1.70
200	24	2400	2586	66.53	98.60	1.70

FinalPartialFanOut transaction costs (with native tokens)

Terminal partial fanout step (FanoutProgress → Final) with outputs carrying a native token. Burns all head tokens and proves accumulator exhaustion via BLS proof.

Distributed	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	120	4123	14.10	40.56	0.92
5	545	4465	23.51	50.11	1.08
10	1070	4885	36.25	62.39	1.29
20	1920	5524	66.55	88.37	1.75
20	2460	6065	66.56	88.52	1.78