SERP API reliability at scale: uptime, latency, concurrency

Key takeaways

Two of the four headline reliability numbers in this category are not uptime at all: DataForSEO publishes 99.95% with no credit terms, and Bright Data's 99.99% is a success rate from a benchmark with a disclosed vested interest.

At 10,000 requests a day the P95 decides your architecture, not the median. Bright Data measures 2.61s P50 against 4.92s P95, and a 2-second median can hide a 15-second tail once queuing starts.

Google's &num=100 removal plus DataForSEO's depth-based pricing took the Live tier from $2.00 to $17.50 per 1,000 at 100 results with AI Overview, a ninefold jump from a change you did not make.

Below a few hundred requests a day, every SERP API looks fine. The failure modes only show up somewhere past 10,000: queue latency, rate-limit rejections, concurrency ceilings. By then you have built on top of one.