chain138-snap

Chain 138 Snap adds DeFi Oracle Meta Mainnet (ChainID 138) and ALL Mainnet (651940) support inside MetaMask: network params, token list, market data, swap quotes, and bridge routes (CCIP and Trustless).

MetaMask already supports Chain 138 as a custom EVM network, but native Swaps, Portfolio Bridge, and USD pricing do not include Chain 138. This Snap provides in-wallet swap quotes, bridge routes, and market data by calling your token-aggregation (or compatible) API.

Install

1. Install MetaMask (extension or mobile).
2. From a dApp or the companion site, connect and add the Snap using the ID below.

Snap ID: npm:chain138-snap

Usage

dApps invoke the Snap via the MetaMask provider:

// Connect / install the Snap (your dApp typically does this once)
await ethereum.request({
  method: 'wallet_requestSnaps',
  params: {
    'npm:chain138-snap': {},
  },
});

// Call a method (e.g. get networks or market data)
const result = await ethereum.request({
  method: 'wallet_invokeSnap',
  params: {
    snapId: 'npm:chain138-snap',
    request: {
      method: 'get_networks',
      params: { apiBaseUrl: 'https://your-token-aggregation-api.com' },
    },
  },
});

For market data, swap quotes, and bridge routes, the dApp must pass apiBaseUrl (your token-aggregation service base URL) in the request params. Optional URL params: networksUrl, tokenListUrl, bridgeListUrl.

RPC methods

| Method | Description | |--------|-------------| | hello | Basic test; returns a greeting. | | get_networks | Full EIP-3085 chain params (Chain 138, Ethereum, ALL Mainnet). | | get_chain138_config | Chain 138 config from API. | | get_chain138_market_chains | Market chains list. | | get_token_list / get_token_list_url | Token list (optional chainId). | | get_oracles | Oracles config. | | show_dynamic_info | In-Snap dialog with networks and token list URL. | | get_market_summary / show_market_data | Tokens and USD prices. | | get_bridge_routes / show_bridge_routes | CCIP and Trustless bridge routes. | | get_swap_quote / show_swap_quote | Swap quote (requires tokenIn, tokenOut, amountIn). |

Repository and docs

• Source: github.com/bis-innovations/chain138-snap
• Integrator guide: INTEGRATORS.md (Snap ID, apiBaseUrl, optional URLs)
• Testing / publishing: TESTING_INSTRUCTIONS.md, PUSH_AND_PUBLISH.md

License

MIT-0 OR Apache-2.0