Use Smart Contract Platform

Overview

Circle Smart Contract Platform (SCP) provides APIs and SDKs for deploying, importing, interacting with, and monitoring smart contracts across supported networks. Deploy contracts from raw bytecode, use audited templates for standard patterns, execute ABI-based contract calls, and monitor emitted events through webhooks.

Prerequisites / Setup

Installation

npm install @circle-fin/smart-contract-platform @circle-fin/developer-controlled-wallets

Environment Variables

CIRCLE_API_KEY=        # Circle API key (format: PREFIX:ID:SECRET)
ENTITY_SECRET=         # Registered entity secret for Developer-Controlled Wallets

SDK Initialization

import { initiateSmartContractPlatformClient } from "@circle-fin/smart-contract-platform";
import { initiateDeveloperControlledWalletsClient } from "@circle-fin/developer-controlled-wallets";

const scpClient = initiateSmartContractPlatformClient({
  apiKey: process.env.CIRCLE_API_KEY!,
  entitySecret: process.env.ENTITY_SECRET!,
});

const walletsClient = initiateDeveloperControlledWalletsClient({
  apiKey: process.env.CIRCLE_API_KEY!,
  entitySecret: process.env.ENTITY_SECRET!,
});

Quick Reference

Supported Blockchains

The references/ examples use Arc Testnet (blockchain: 'ARC-TESTNET'); for Arc mainnet, pass blockchain: 'ARC'. The Arc USDC address 0x3600000000000000000000000000000000000000 is the same on both networks.

Contract Templates

Key API Response Fields

• Contract functions: getContract().data.contract.functions
• Contract address: contract.contractAddress (fallback: contract.address)
• Transaction ID: createContractExecutionTransaction().data.id
• Deployment status: getContract().data.contract.deploymentStatus

Core Concepts

Dual-Client Architecture

SCP workflows pair two SDK clients:

• Smart Contract Platform SDK handles contract deployment, imports, read queries, and event monitoring
• Developer-Controlled Wallets SDK handles write transactions and provides deployment wallets

Write operations use walletsClient.createContractExecutionTransaction(), NOT the SCP client.

Read vs Write Contract Calls

• Read queries (view/pure functions) use scpClient.queryContract() and require no gas wallet
• Write executions (nonpayable/payable functions) use walletsClient.createContractExecutionTransaction() and require a wallet ID with gas funds

Signature Formatting

• Function signatures: name(type1,type2,...) with no spaces
• Event signatures: EventName(type1,type2,...) with no spaces
• Parameter order must exactly match ABI definitions

Idempotency Keys

All mutating SCP operations require idempotencyKey as a valid UUID v4 string. Use crypto.randomUUID() in Node.js. Non-UUID keys fail with generic API parameter invalid errors.

Deployment Async Model

Contract deployment is asynchronous. The response indicates initiation only. Poll getContract() for deploymentStatus.

EVM Version Constraint

Compile Solidity with evmVersion: "paris" or earlier to avoid the PUSH0 opcode. Solidity >= 0.8.20 defaults to Shanghai. Arc and other non-Shanghai chains fail deployment with ESTIMATION_ERROR / Create2: Failed on deploy if bytecode contains PUSH0.

Transaction Lifecycle

Write operations (contract deployments, executions) follow the same asynchronous state machine as Developer-Controlled Wallets. Poll with walletsClient.getTransaction({ id: txId }) until a terminal state is reached.

Happy path: INITIATED -> CLEARED -> QUEUED -> SENT -> CONFIRMED -> COMPLETE

Terminal states:

• COMPLETE -- Transaction succeeded and is finalized on-chain.
• FAILED -- Transaction reverted or encountered an unrecoverable error.
• DENIED -- Transaction was rejected by risk screening.
• CANCELLED -- Transaction was cancelled before on-chain submission.

Intermediate states:

• INITIATED -- Request accepted, not yet validated or checked.
• WAITING -- In queue for validation and compliance checks.
• QUEUED -- Queued for submission to the blockchain.
• CLEARED -- Passed compliance checks.
• SENT -- Submitted to the blockchain, awaiting confirmation.
• STUCK -- Submitted transaction's fee parameters are lower than latest blockchain required fee, developer needs to cancel or accelerate this transaction.
• CONFIRMED -- Included in a block, awaiting finality.

Contract deployment status is tracked separately via scpClient.getContract() using deploymentStatus.

For debugging failed transactions, see Transaction States and Errors.

Error Handling

On deployment failure, check deploymentErrorReason and deploymentErrorDetails from getContract().

Implementation Patterns

1. Deploy Contract from Bytecode

Deploy a compiled contract using raw ABI + bytecode.

READ references/deploy-bytecode.md for the complete guide.