Multi-Chain Subgraph Deployment Coordinator

WHAT IT DOES

Multi-Chain Subgraph Deployment Coordinator is a read-only developer tool that generates coordinated subgraph configurations for deploying The Graph subgraphs across multiple EVM chains simultaneously. It reads contract bytecode and ABI from a primary chain, extracts events and functions, and generates consistent schema.graphql, chain-specific subgraph.yaml manifests, and shared event handler stubs for each target chain. The tool calculates appropriate start blocks for each chain based on the current chain head and deployment metadata, validates chain configurations against a built-in network database, and produces a comprehensive deployment plan. This helps developers deploy subgraphs to Ethereum, Polygon, BSC, Arbitrum, Optimism, and Avalanche with consistent schemas and minimal manual configuration.

HOW TO USE

Connect your EVM-compatible wallet via the BGWallet bridge and select the network where your contract is deployed. Enter a subgraph name, the contract address (same across all chains), and a comma-separated list of target chains (e.g., ethereum,polygon,bsc,arbitrum,optimism,avalanche). Click "Generate Multi-Chain Config" to produce the coordinated configuration. Results include a shared schema.graphql, per-chain subgraph.yaml manifests with correct network names and start blocks, shared event handler stubs, and a deployment plan with step-by-step instructions. The tool also validates chain names against the supported list and flags any invalid entries. All analysis is read-only—no signatures or transactions are submitted.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to fetch contract bytecode via provider.getCode(address) from the primary chain, extracts function selectors using PUSH4 opcode detection (0x63) and maps them to common function signatures (transfer, approve, balanceOf, totalSupply, allowance). Standard event definitions (Transfer, Approval) are included to generate a complete ABI. The tool maintains a built-in network database (NETWORK_MAP) that maps chain names to Graph network names (e.g., "ethereum" → "mainnet", "polygon" → "matic", "bsc" → "bsc"), chain IDs, and RPC endpoints. For each target chain, the tool generates a subgraph.yaml manifest with the correct network name, contract address, and a start block calculated as current_block - 500,000 blocks (providing a safe margin for historical data). The schema.graphql is generated from the event ABIs with GraphQL entity types (fields mapped to Bytes, BigInt, Boolean, or String). Event handler stubs are generated as TypeScript functions that import event types from the generated contract. The user-provided chain list is validated against the network database; invalid chains are flagged in the results. The output includes the shared schema, per-chain manifests, event handlers, and a deployment plan.

WHAT IT CANNOT SEE

This tool has fundamental limitations that users must understand. It cannot actually deploy subgraphs across multiple chains—the tool generates configuration files but does not integrate with The Graph's deployment CLI or Graph Node infrastructure. It cannot handle per-chain differences in event structures without manual schema overrides—if the contract emits different events or has different event signatures on different chains, the shared schema will not capture those differences. It cannot guarantee cross-chain data consistency or synchronization—the tool does not manage data aggregation or cross-chain querying. It cannot manage chain-specific dependencies or RPC variations—the tool assumes consistent contract behavior across chains and does not account for chain-specific quirks. It cannot coordinate deployment ordering or versioning across chains without manual intervention—the tool generates configurations but does not orchestrate the actual deployment sequence. It cannot support non-EVM chains—the tool only supports networks in its built-in database. It cannot detect whether the contract is actually deployed on each target chain—the tool assumes the contract exists on all specified chains. It cannot estimate gas costs or deployment fees for the subgraph deployment process. It cannot monitor sync status or health of deployed subgraphs across chains.

PLEASE NOTE

This tool only supports EVM-compatible blockchains (Ethereum, Polygon, BSC, Avalanche C-Chain, Optimism, Arbitrum, and their testnets). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is free, open-source, requires no API keys, and uses the wallet's native provider for all read operations. Generated configurations should be reviewed and tested on each chain before production deployment.