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	2026-08-27 13:44:38.690055649 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νHead	1d511733200df551c8cd8cddb3160ed39087af815638be37a1b80ffd	12962
μHead	603f261bc5a01f5f4ed988cc07a40a130b94e6820c28e9affde82d9e*	4971
νDeposit	eafae2c32f99ab347c7bb15961e0e84c74305f9088c1a7b8abf88e7f	2117
νCRS	09db7ee6cf7a4b358dd5c8a2f19d2c048336ffc5a01ef35a47ca7072	2736

• 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	5475	9.34	3.07	0.49
2	5569	9.64	3.15	0.50
3	5669	10.55	3.46	0.51
5	5861	11.36	3.71	0.53
10	6340	14.07	4.58	0.58
50	10182	35.21	11.18	0.97
100	14980	62.32	19.67	1.46
114	16324	69.34	21.87	1.59

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	2822	21.40	7.67	0.70
2	2954	22.47	8.67	0.72
3	3085	23.10	9.53	0.74
5	3351	24.87	11.43	0.78
10	4003	30.38	16.52	0.89
50	9244	72.71	56.41	1.75
75	12519	98.96	81.32	2.29

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	643	18.50	6.69	0.58
2	776	19.47	7.67	0.60
3	903	20.45	8.64	0.62
5	1167	22.41	10.60	0.66
10	1823	27.23	15.46	0.76
50	7063	68.38	54.97	1.61
75	10338	92.94	79.34	2.13

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
3	935	19.68	13.61	0.65
5	1194	21.63	15.56	0.69
50	7090	67.66	60.06	1.64
75	10365	93.83	84.94	2.18

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	700	21.49	14.90	0.66
2	832	22.65	15.94	0.68
3	963	23.78	16.96	0.71
5	1226	26.02	19.01	0.75
10	1881	31.84	24.18	0.86
50	7117	79.94	65.84	1.78
67	9348	99.66	83.35	2.17

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	5644	23.70	43.00	1.14
10	1	57	5679	26.05	45.51	1.18
10	5	285	5814	36.28	55.83	1.34
10	10	568	5983	50.26	69.12	1.56
10	20	1138	6322	82.76	97.10	2.04
1	20	1140	6046	76.54	95.13	1.96
5	20	1139	6169	79.31	96.01	2.00
10	20	1140	6325	82.76	97.10	2.04
20	20	1137	6631	90.08	99.38	2.13
50	15	855	7395	95.05	92.01	2.15

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	35.29	66.46	1.20
25	23	1311	1430	68.58	99.53	1.73
30	23	1311	1430	68.58	99.53	1.73
40	23	1310	1429	68.58	99.53	1.73
50	23	1306	1425	68.58	99.53	1.73
100	23	1309	1428	68.58	99.53	1.73
150	23	1308	1427	68.58	99.53	1.73
200	23	1309	1424	68.58	99.53	1.73
200	23	1310	1429	68.58	99.53	1.73

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	42.27	69.01	1.30
25	21	2289	2544	76.71	99.25	1.84
30	21	2247	2500	76.71	99.25	1.84
40	21	2016	2258	76.71	99.20	1.83
50	21	2373	2633	76.69	99.30	1.84
100	21	2142	2391	76.69	99.24	1.83
150	21	2415	2677	76.71	99.30	1.84
200	21	2247	2497	76.71	99.25	1.84
200	21	2100	2347	76.69	99.20	1.83

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	5539	22.51	44.44	1.14
5	545	5881	36.06	55.95	1.34
10	1070	6301	54.18	70.73	1.62
10	1060	6290	54.06	70.70	1.61