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WASM provides a secure and properly sandboxed execution environment for contracts execution. As for now - Rust is being supported.


Historically Warp Contracts SDK had a support for Go and AssemblyScript. Because of some technical issues, immaturity and lack of interest in the community - we've decided to focus on Rust. The support for AS and Go has been removed in this PR.

WASM contracts templates containing example PST contract implementation within tools for compiling contracts to WASM, testing, deploying (locally, on testnet and mainnet) and writing interactions are available in a dedicated repository.

Using SDKs' methods works exactly the same as in case of a regular JS contract. While deploying the contract, you just need to pass some additional arguments:

const contractTxId = await warp.deploy({
initState: JSON.stringify(initialState),
src: contractSrc,
wasmSrcCodeDir: path.join(__dirname, '../data/wasm/rust/src'),
wasmGlueCode: path.join(__dirname, '../data/wasm/rust/rust-pst.js'),

Additionally, it is possible to set gas limit for interaction execution in order to e.g. protect a contract against infinite loops. Defaults to Number.MAX_SAFE_INTEGER (2^53 - 1).

contract = smartweave.contract(contractTxId).setEvaluationOptions({
gasLimit: 14000000,