API performance data

We publish data about our mobile and PSD2-regulated API performance every quarter.

The data shows the quality of service we provide to third parties building banking apps using our APIs. It is important to us to demonstrate that we provide the same level of service to third parties that we give to our own app.

If you’d like to read more about our APIs, you can check out our developer documentation, and you can find more information about the revised Payment Service Directive (PSD2) in general here.

Select the quarter you want to see

	Service Availability (%)	Average Response (ms)	Error rate (% failed calls)	Successful API calls (%)
	99.95	52	0.03	99.97
Industry Wide	98.7	820	1.75	98.25

Source

Starling Headline performance for Q2 2025

Day	Uptime mobile (%)	Downtime mobile (%)	Uptime dedicated (%)	Downtime dedicated (%)	Error rate dedicated (%)
1	100	0	100	0	0
2	100	0	100	0	0
3	100	0	100	0	0
4	100	0	100	0	0
5	100	0	100	0	0
6	100	0	100	0	0
7	100	0	100	0	0
8	100	0	100	0	0
9	100	0	100	0	0
10	100	0	100	0	0
11	100	0	100	0	0
12	100	0	100	0	0
13	100	0	100	0	0
14	100	0	100	0	0
15	100	0	100	0	0
16	100	0	100	0	0
17	100	0	100	0	0
18	100	0	100	0	0
19	100	0	100	0	0
20	100	0	100	0	0
21	100	0	100	0	0
22	100	0	100	0	0
23	100	0	100	0	0
24	99.67	0.33	99.67	0.33	0.08
25	100	0	100	0	0
26	100	0	100	0	0
27	100	0	100	0	0
28	100	0	100	0	0
29	100	0	100	0	0
30	100	0	100	0	0
31	100	0	100	0	0.01
32	100	0	100	0	0
33	100	0	100	0	0
34	100	0	100	0	0
35	100	0	100	0	0
36	100	0	100	0	0
37	100	0	100	0	0
38	100	0	100	0	0
39	100	0	100	0	0
40	100	0	100	0	0
41	100	0	100	0	0
42	100	0	100	0	0
43	100	0	100	0	0
44	100	0	100	0	0
45	100	0	100	0	0
46	100	0	100	0	0
47	100	0	100	0	0
48	100	0	100	0	0
49	100	0	100	0	0
50	100	0	100	0	0
51	100	0	100	0	0
52	100	0	100	0	0
53	100	0	100	0	0
54	100	0	100	0	0
55	100	0	100	0	0
56	100	0	100	0	0
57	100	0	100	0	0
58	100	0	100	0	0
59	100	0	100	0	0
60	100	0	100	0	0
61	100	0	100	0	0
62	100	0	100	0	0
63	100	0	100	0	0
64	96.67	3.33	96.67	3.33	1.6
65	100	0	100	0	0
66	100	0	100	0	0
67	100	0	100	0	0
68	100	0	100	0	0
69	100	0	100	0	0
70	100	0	100	0	0
71	100	0	100	0	0
72	100	0	100	0	0
73	100	0	100	0	0
74	100	0	100	0	0
75	100	0	100	0	0
76	100	0	100	0	0
77	100	0	100	0	0
78	100	0	100	0	0
79	100	0	100	0	0
80	100	0	100	0	0
81	100	0	100	0	0
82	100	0	100	0	0
83	100	0	100	0	0
84	100	0	100	0	0
85	100	0	100	0	0
86	100	0	100	0	0
87	99.3	0.7	99.92	0.08	0.14
88	98.75	1.25	98.75	1.25	0.53
89	100	0	100	0	0
90	100	0	100	0	0
91	100	0	100	0	0
92	100	0	100	0	0

Interface response times in milliseconds

Day	Payment Initiation (Dedicated)	Account information (Dedicated)	Funds check (Dedicated)	Payment Initiation (Mobile)	Account information (Mobile)
1	129	97	0	116	30
2	126	78	0	106	20
3	127	36	0	109	19
4	182	36	0	113	18
5	140	35	0	109	17
6	125	34	0	107	16
7	122	34	0	106	17
8	146	39	0	121	19
9	152	40	0	129	21
10	181	42	0	140	21
11	170	40	0	141	22
12	177	41	0	144	25
13	173	40	0	136	22
14	158	39	0	126	21
15	171	48	0	149	28
16	238	52	0	164	31
17	217	54	0	183	27
18	211	56	0	184	27
19	232	58	0	199	39
20	203	51	0	173	25
21	193	50	0	163	24
22	234	51	0	205	29
23	219	50	0	189	28
24	220	50	0	193	28
25	228	51	0	199	30
26	268	54	0	233	38
27	209	48	0	185	30
28	210	48	0	185	28
29	263	56	0	240	34
30	246	54	0	210	30
31	275	55	0	251	36
32	235	55	0	223	30
33	243	54	0	200	29
34	192	49	0	162	25
35	196	50	0	163	25
36	228	52	0	198	28
37	229	50	0	191	27
38	225	50	0	189	27
39	221	48	0	190	27
40	225	57	0	194	38
41	204	54	0	171	35
42	197	47	0	165	29
43	221	52	0	197	32
44	226	50	0	185	30
45	228	49	0	186	32
46	231	51	0	185	32
47	231	50	0	193	33
48	225	47	0	177	32
49	203	47	0	166	32
50	251	52	0	213	42
51	250	47	0	187	33
52	236	48	0	192	35
53	237	49	0	204	34
54	255	52	0	215	33
55	237	47	0	193	29
56	203	47	0	191	29
57	228	47	0	196	29
58	270	51	0	227	32
59	279	53	0	218	35
60	245	51	0	216	31
61	280	55	0	241	37
62	236	46	0	196	31
63	245	50	0	206	31
64	245	49	0	210	31
65	239	50	0	196	30
66	281	50	0	193	30
67	250	49	0	209	30
68	249	52	0	225	26
69	220	46	0	197	17
70	208	46	0	195	17
71	255	52	0	241	18
72	269	59	0	256	19
73	313	63	0	266	20
74	285	61	0	251	20
75	266	52	66	242	18
76	235	48	0	204	17
77	227	48	0	213	19
78	260	52	0	239	18
79	372	49	89	212	22
80	233	50	53	210	19
81	205	49	0	194	18
82	363	52	84	219	19
83	218	47	0	190	17
84	301	47	0	198	20
85	288	56	66	253	22
86	302	59	0	291	22
87	284	84	64	308	45
88	307	95	59	439	123
89	192	49	114	215	24
90	173	45	0	176	17
91	163	44	0	174	17
92	182	50	0	199	21

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