411data.io

5 listed endpoints · free reliability snapshot (reduced density)

endpoint	grade	uptime 30d	conf.
/api/v1/enrich/phone	B 74.8	90.0%	0.75
/api/v1/enrich/person	B 74.4	90.0%	0.75
/api/v1/support/tickets	B 74.3	90.0%	0.75
/api/v1/enrich/lead-session	B 73.8	88.3%	0.75
/api/v1/enrich/websearch	B 74.7	90.0%	0.75

Scores use reduced-density sampling; live probe, full 30-min density and 90-day history via the paid API.