402 or 429: which gate stops a 100-ad batch first on Sume?

Which error stops a burst first depends on the job price and the balance. Compare the balance divided by the job price with the plan's accepted capacity: if the balance buys fewer jobs than the plan accepts, you see 402 first; if the plan accepts fewer, you see 429 queue_full first. Both are documented in the generation admission page.

Worked table: a 10-second 720p Seedance 2.5 ad

One such job is $5.78 on Sume. The table shows how many jobs a given balance reserves against the Pro accepted capacity of 24 jobs.

What the order tells you

With a small balance you hit 402 and a top-up fixes it. With a large balance on a small plan you hit 429, and only waiting or a bigger plan fixes it. Handle them differently in code: back off and retry on 429, stop and alert on 402.

Credits do not raise concurrency: the docs say processing concurrency is plan-only.