Starknet RPC execute_v3 Issue - Minimal Reproduction

This is a minimal reproducible example of an issue with starknet-rs library when sending transactions via execute_v3().

Error

Error: JSON-RPC error: code=-32602, message="Invalid params",
data={"reason":"missing field: \"l1_data_gas\""}

Setup

1. Create new project

cargo new starknet_rpc_issue
cd starknet_rpc_issue

2. Replace files

• Copy minimal_repro.rs → src/main.rs
• Copy minimal_repro_Cargo.toml → Cargo.toml

3. Set environment variables

export STARKNET_RPC_URL="https://starknet-sepolia.public.blastapi.io/rpc/v0_7"
export STARKNET_ACCOUNT_ADDRESS="0x34f8a494958da4baf6cb3dece3bcb6b634792311cde25e94fc4b8a3b0cddbbb"
export STARKNET_PRIVATE_KEY="0x65ec6ec925b60110f4b2bffccd6782102faa51676088f71dd3633771e3ee489"
export BRIDGE_CONTRACT="0x02d2d7992105dad299bd0877595e7172fb5f7ca527dcf69d92a6c98640c7522c"

4. Run

cargo run

Expected Output

The program will fail with:

❌ Error occurred:
   JSON-RPC error: code=-32602, message="Invalid params", data={"reason":"missing field: \"l1_data_gas\""}

Environment

• Library: starknet-rs @ 171b0c65cac407ee33972e0ab2c3f8744c083753
• RPC Endpoint: Blast API (Sepolia)
• Network: Starknet Sepolia
• Transaction Version: v3 with ExecutionEncoding::New

Things Tried

Attempt	Result
Using ExecutionEncoding::New	✅ Correct setup but still fails
RPC endpoint v0_7	❌ Same error
RPC endpoint v0_9	❌ Same error
Using execute_v1()	❌ "UnsupportedTxVersion"
Using execute() (v2)	❌ "UnsupportedTxVersion"

Workaround

CLI tools work fine:

sncast --account=sepolia invoke \
  --contract-address=0x02d2d7992105dad299bd0877595e7172fb5f7ca527dcf69d92a6c98640c7522c \
  --function=claim_deposit \
  --arguments <ARGS> \
  --network=sepolia

Questions

1. Is this a known compatibility issue with this library version?
2. Should we use a different RPC endpoint (Infura, Alchemy)?
3. Do we need to manually set resource bounds?
4. Is there a newer stable version that fixes this?
5. Does the library version match what's expected by the RPC endpoint?

Files for Gist

Upload these 3 files to GitHub Gist:

1. minimal_repro.rs (rename to main.rs in gist)
2. minimal_repro_Cargo.toml (rename to Cargo.toml in gist)
3. This README (rename to README.md in gist)