Fetch YouTube subtitles/transcript (VTT) by 11-char video_id; returns a presigned download URL to the .vtt file
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp | exact | 0.01 tokens | 9MkM5R...1vde |
| Base | exact | $0.01 USDC | 0xC751...86A1 |
| eip155:143 | exact | 0.01 tokens | 0xC751...86A1 |