Switchboard Feed Simulation

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Key Features

• Price feed simulation
• Customizable Crossbar endpoint
• Mainnet feed support
• LangChain tool integration
• Error handling and validation

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Basic Usage

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Simulating a Price Feed

const result = await agent.methods.simulateSwitchboardFeed(
  "GvDMxPzN1sCj7L26YDK2HnMRXEQmQ2aemov8YBtPS7vR",  // Feed public key
  "https://crossbar.switchboard.xyz"                 // Optional Crossbar URL
);

​

Input Parameters

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Feed Simulation Parameters

interface SimulateFeedParams {
  feed: string;           // Feed public key (hash)
  crossbarUrl?: string;   // Optional Crossbar URL
}

​

Response Type

interface SwitchboardSimulateFeedResponse {
  status: "success" | "error";
  feed?: string;          // Feed public key
  value?: number;         // Simulated feed value
  message?: string;       // Error message if status is "error"
  code?: string;          // Error code if status is "error"
}

​

LangChain Integration

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Simulate Feed Tool

import { SolanaSwitchboardSimulateFeed } from 'solana-agent-kit';

const simulateFeedTool = new SolanaSwitchboardSimulateFeed(agent);

// Tool input format (JSON string):
const input = JSON.stringify({
  feed: "GvDMxPzN1sCj7L26YDK2HnMRXEQmQ2aemov8YBtPS7vR",
  crossbarUrl: "https://crossbar.switchboard.xyz"  // Optional
});

// Tool returns JSON response:
{
  status: "success",
  feed: "GvDMxPzN1sCj7L26YDK2HnMRXEQmQ2aemov8YBtPS7vR",
  value: 1234567
}

​

Example Prompts

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Feed Simulation

"Simulate the SOL/USD price feed"
"Get the current BTC price from Switchboard"
"Check the ETH/USD oracle feed"

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Important Notes

1. Feed Public Keys
   • Must be valid Switchboard feed addresses
   • Only mainnet feeds are supported
   • Feed hash must be base58 encoded
2. Crossbar Configuration
   • Default URL: https://crossbar.switchboard.xyz
   • Custom URLs must be valid Crossbar instances
   • SSL validation is enabled by default
3. Response Handling
   • Values are returned as integers
   • Empty results indicate invalid feed hash
   • Network errors are propagated

​

Best Practices

1. Error Handling
   try {
     const result = await agent.methods.simulateSwitchboardFeed(feed);
     if (!result) {
       // Handle empty result
     }
   } catch (error) {
     if (error.message.includes("feed hash")) {
       // Handle invalid feed address
     } else if (error.message.includes("network")) {
       // Handle connection issues
     }
   }
   
2. Feed Validation
   function isValidFeedAddress(feed: string): boolean {
     try {
       return feed.length === 44 || feed.length === 43;
     } catch {
       return false;
     }
   }
   
3. Response Processing
   // Convert response to number
   const value = Number.parseInt(result);
   if (isNaN(value)) {
     throw new Error("Invalid feed response");
   }
   

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Technical Details

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Constants

const SWITCHBOARD_DEFAULT_CROSSBAR = "https://crossbar.switchboard.xyz";

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CrossbarClient Configuration

const crossbar = new CrossbarClient(crossbarUrl, true);  // SSL enabled

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Common Feed Addresses

const FEEDS = {
  SOL_USD: "GvDMxPzN1sCj7L26YDK2HnMRXEQmQ2aemov8YBtPS7vR",
  BTC_USD: "8SXvChNYFhRq4EZuZvnhjrB3jJRQCv4k3P4W6hesH3Ee",
  ETH_USD: "HNStfhaLnqwF2ZtJUizaA9uHqgE6QK6tZkoySdJ5XoZF"
};

​

Network Configuration

const NETWORK_CONFIG = {
  CHAIN: "mainnet",
  MAX_RETRIES: 3,
  TIMEOUT: 5000
};

​

Error Messages

const ERROR_MESSAGES = {
  INVALID_FEED: "Did you provide the right mainnet feed hash?",
  EMPTY_RESULT: "No results returned from simulation",
  NETWORK_ERROR: "Failed to connect to Crossbar service"
};

​

Examples

1. Basic Feed Simulation
   const value = await agent.methods.simulateSwitchboardFeed(
     FEEDS.SOL_USD
   );
   console.log(`Current SOL price: $${value}`);
   
2. Custom Crossbar Instance
   const value = await agent.methods.simulateSwitchboardFeed(
     FEEDS.BTC_USD,
     "https://my-crossbar.example.com"
   );
   
3. Error Handling
   try {
     const value = await agent.methods.simulateSwitchboardFeed(feed);
     console.log(`Feed value: ${value}`);
   } catch (error) {
     console.error(`Simulation failed: ${error.message}`);
   }