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Steel · hard

63. Steel: Modular CPI Helpers

Ergonomic system and token calls.

1 min read2 questionsup to 50 XPtopic 63/100

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Steel includes clean, lightweight helpers for common CPIs like transferring SOL, creating accounts, and moving tokens without heavy dependencies.

rust
transfer_signed(
    &program_id,
    from_info,
    to_info,
    system_program,
    amount,
    &[&[b"vault", &[bump]]],
)?;

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

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  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. How does Steel simplify native CPI calls like transfer_signed?

  2. 2. Can Steel programs CPI into standard SPL Token programs?

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