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Library author here - yes, one execution happens per tile, if you have CloudFront in front those will only happen when the PoP has a miss.

With 512MB RAM these generally complete in under 100ms so the unit costs of Lambda are within a few multiples of Cloudflare Workers (.5USD / million invocations)

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Hey, want to say I'm super excited by protomaps. I'm struggling a bit to convert existing OSM pbf files into the pmtiles format. Specifically, I'm trying to convert this guy https://daylightmap.org/

Do you have any tips for doing so without renting memory in the cloud?

The daylight PBFs are difficult to combine without a lot of RAM, there's no way around it right now. Either do that or hold out for potential newer releases of the data delivered as Parquet files.

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