Price Feed

Oracle-style price feed with staleness detection

Deployed Anchor 0.32

Program ID 6uafjLqqMeP4DgYqDuVPCL9BVabC7ruQC6SnDdUvXqC5

Repository ExpertVagabond/solana-price-feed

Binary Size 215K

Cluster Devnet

Instructions

IX initialize_feed

Creates a new price feed for a trading pair with the specified decimal precision.

Parameter	Type	Description
`symbol`	`String`	Trading pair symbol, e.g. "SOL/USD" (max 16 characters)
`decimals`	`u8`	Number of decimal places for the price value

IX update_price

Publishes a new price update with a confidence interval. Only callable by the authority.

Parameter	Type	Description
`price`	`i64`	Current price value (signed to support negative rates)
`confidence`	`u64`	Confidence interval around the price

IX read_price

Reads the current price from the feed. Returns an error if the price data is stale.

Parameter	Type	Description
No parameters

IX transfer_authority

Transfers the price update authority to a new wallet.

Parameter	Type	Description
`new_authority`	`Pubkey`	The new authority wallet address

Accounts

PriceFeed

Field	Type	Description
`authority`	`Pubkey`	Oracle operator with update permissions
`symbol`	`String`	Trading pair symbol (e.g. "SOL/USD")
`decimals`	`u8`	Price decimal precision
`price`	`i64`	Latest price value
`confidence`	`u64`	Confidence interval width
`last_update`	`i64`	Timestamp of the last price update
`update_count`	`u64`	Total number of price updates
`bump`	`u8`	PDA bump seed

PDA Derivation

feed

seeds = [b"feed", authority]

Error Codes

SymbolTooLong Feed symbol exceeds the maximum 16 character limit

StalePrice The price data has not been updated recently enough to be reliable

Overflow Arithmetic overflow in price calculation

Usage Example

import { Program, BN } from "@coral-xyz/anchor";
import { PublicKey } from "@solana/web3.js";

// Initialize a SOL/USD price feed with 8 decimal places
const [feedPda] = PublicKey.findProgramAddressSync(
  [Buffer.from("feed"), authority.publicKey.toBuffer()],
  program.programId
);

await program.methods
  .initializeFeed("SOL/USD", 8)
  .accounts({
    feed: feedPda,
    authority: authority.publicKey,
  })
  .signers([authority])
  .rpc();

// Publish a price update: $145.50 with $0.25 confidence
await program.methods
  .updatePrice(
    new BN(14_550_000_000),    // price: $145.50 (8 decimals)
    new BN(25_000_000)         // confidence: $0.25
  )
  .accounts({
    feed: feedPda,
    authority: authority.publicKey,
  })
  .signers([authority])
  .rpc();

// Read the current price
const feedData = await program.account.priceFeed.fetch(feedPda);
console.log(`Price: ${feedData.price.toNumber() / 1e8}`);
console.log(`Confidence: +/- ${feedData.confidence.toNumber() / 1e8}`);