coinsentry sends crypto price alerts with median 2.8-second delivery and automatic retry, backed by a public uptime page. 13 exchanges, 15,000+ pairs, each alert pinned to one exchange's real feed — no blended index prices. Alerts never expire, one-shot or re-arming. Telegram, Discord, Slack, email, HMAC-signed webhooks. No API keys needed. Free plan (10 alerts); Pro $7.99/mo, 30-day free trial, no card.