docs(developer-hub): add Migrate from Core guide for Pyth Pro #3595
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| title: Migrate from Core | ||||||
| description: Technical migration guide for developers moving from Pyth Core to Pyth Pro — architecture, data semantics, endpoints, and contract changes for EVM and SVM | ||||||
| slug: /price-feeds/pro/migrate-from-core | ||||||
| --- | ||||||
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| import { Callout } from "fumadocs-ui/components/callout"; | ||||||
| import { Tab, Tabs } from "fumadocs-ui/components/tabs"; | ||||||
| import { Steps, Step } from "fumadocs-ui/components/steps"; | ||||||
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| **Pyth Pro** delivers the same first-party publisher data as **Pyth Core**, but through standard WebSocket and REST APIs with configurable update speeds and a streamlined on-chain verification path. | ||||||
| This guide covers everything you need to migrate an existing Pyth Core integration. | ||||||
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| <Callout type="info"> | ||||||
| **Pyth Pro was previously known as Pyth Lazer.** SDK package names still use | ||||||
| the `lazer` naming. | ||||||
| </Callout> | ||||||
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| ## What Stays the Same | ||||||
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| Before diving into what changes, here's what doesn't: | ||||||
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| - **Same data quality** — first-party publisher data from 120+ sources including major exchanges and market makers | ||||||
| - **Same data fields** — price, confidence interval, exponent, and timestamp are available in both Core and Pro | ||||||
| - **Same exponent model** — both use fixed-point representation: `actual_price = mantissa × 10^exponent` | ||||||
| - **On-chain verification** — both products guarantee data authenticity through cryptographic verification | ||||||
| - **Permissionless consumption** — once price data is verified on-chain, any contract can read it | ||||||
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| ## Architecture Changes | ||||||
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| **Data delivery** remains similar. With Core, you fetch price updates from **Hermes** (an off-chain relay for Pythnet data) and submit them on-chain in the same transaction. | ||||||
| With Pro, prices stream directly from publishers via WebSocket. On-demand queries are also available via REST. | ||||||
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| **Update frequency** becomes configurable. Core updates every 400ms (fixed). Pro lets you choose per subscription: `real_time`, `fixed_rate@50`, `fixed_rate@200ms` or `fixed_rate@1000ms`. | ||||||
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Contributor
There was a problem hiding this comment. 🟡 Incorrect channel name Line 34 lists the channel name as
Suggested change
Was this helpful? React with 👍 or 👎 to provide feedback. |
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| **On-chain verification** uses a different signature scheme. Core verifies data using **Wormhole VAA** (guardian multi-sig) through the Pyth Receiver contract. Pro uses **Ed25519 signature verification** through the Pyth Lazer verifier contract. | ||||||
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There was a problem hiding this comment.
This sentence states that Pyth Pro verification uses Ed25519 universally, but that is not true for EVM consumers in this repo: the EVM format is documented as secp256k1 ECDSA and the verifier contract uses Useful? React with 👍 / 👎.
Contributor
There was a problem hiding this comment. i'd also mention there is no push model in Pro for on-chain verification, only pull |
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| **Price feed IDs** change format. Core uses `bytes32` hashes. Pro uses `uint32` numeric IDs. You will need to map your feed IDs. Consult the [Price Feed IDs](./price-feed-ids) page for the complete list. | ||||||
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| ## Behavioral Differences | ||||||
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| Core and Pro aggregate publisher data differently. These differences affect how you interpret prices, confidence, and timestamps. | ||||||
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| | Aspect | Core | Pro | | ||||||
| | ---------------------------- | --------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | | ||||||
| | **Confidence calculation** | Each publisher contributes 3 votes (price, price + conf, price - conf). Confidence is the IQR of these 3N points. | IQR computed directly on all publisher prices, bids, and asks. | | ||||||
| | **Price aggregation** | Weighted median of 3N votes — confident publishers have more influence. | Simple median across publishers. | | ||||||
| | **Timestamps** | `publish_time` in Unix seconds. | `timestampUs` and `feedUpdateTimestamp` in microseconds (μs). | | ||||||
| | **Staleness handling** | `getPriceNoOlderThan()` reverts if data exceeds max age. | Carries forward the last known price. Compare `feedUpdateTimestamp` against `timestampUs` to detect stale data. | | ||||||
| | **Best bid/ask** | Not available. | Available via `bestBidPrice` and `bestAskPrice` properties. (Experimental) | | ||||||
| | **EMA price** | Available (slot-weighted, inverse confidence-weighted, ~1 hour period). | Available (`emaPrice`, `emaConfidence`). | | ||||||
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| <Callout type="warning"> | ||||||
| Pyth Pro EVM contracts don't store the prices on-chain. The prices are parsed from the payload and verified on-chain. | ||||||
| That's why Pyth Pro does **not** revert on stale prices. You must check `feedUpdateTimestamp` | ||||||
| yourself to determine whether a price is fresh or carried forward. See | ||||||
| [Payload Reference — Price Availability | ||||||
| Semantics](/price-feeds/pro/payload-reference#core-price-properties) for | ||||||
| details. | ||||||
| </Callout> | ||||||
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Contributor
There was a problem hiding this comment. said another way - there is no push model in Pro for on-chain verification, only pull model. (from what i've seen, people are familiar with this verbiage.) |
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| ## Endpoint Changes | ||||||
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| <Tabs items={["Core Endpoints", "Pro Endpoints"]}> | ||||||
| <Tab value="Core Endpoints"> | ||||||
| | What | Value | | ||||||
| | ---------------- | -------------------------------------------------------- | | ||||||
| | Price updates | `https://hermes.pyth.network/v2/updates/price/latest` | | ||||||
| | Authentication | None (permissionless) | | ||||||
| | TypeScript SDK | `@pythnetwork/hermes-client` | | ||||||
| </Tab> | ||||||
| <Tab value="Pro Endpoints"> | ||||||
| | What | Value | | ||||||
| | ---------------- | ------------------------------------------------------------------- | | ||||||
| | Streaming | `wss://pyth-lazer-{0,1,2}.dourolabs.app/v1/stream` | | ||||||
| | REST (latest) | `POST https://pyth-lazer.dourolabs.app/v1/latest_price` | | ||||||
| | REST (historical)| `GET https://pyth.dourolabs.app/v1/{channel}/history` | | ||||||
| | Authentication | Bearer token in `Authorization` header | | ||||||
| | TypeScript SDK | `@pythnetwork/pyth-lazer-sdk` | | ||||||
| </Tab> | ||||||
| </Tabs> | ||||||
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| <Callout type="warning"> | ||||||
| Connect to **all three** WebSocket endpoints (`pyth-lazer-0`, `pyth-lazer-1`, | ||||||
| `pyth-lazer-2`) for redundancy. Individual endpoints go down briefly during | ||||||
| deployments. | ||||||
| </Callout> | ||||||
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Contributor
There was a problem hiding this comment. I'd mention that this is automatically handled by our TS SDK |
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| ## EVM Migration | ||||||
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| Integrating with **Pyth Pro** on EVM chains uses the **Pyth Lazer Solidity SDK** instead of the `IPyth` interface. The verification and reading pattern changes significantly. | ||||||
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| <Tabs items={["Core (IPyth)", "Pro (PythLazer)"]}> | ||||||
| <Tab value="Core (IPyth)"> | ||||||
| ```solidity copy | ||||||
| uint fee = pyth.getUpdateFee(updateData); | ||||||
| pyth.updatePriceFeeds{value: fee}(updateData); | ||||||
| PythStructs.Price memory price = pyth.getPriceNoOlderThan(priceFeedId, maxAge); | ||||||
| // price.price, price.conf, price.expo, price.publishTime | ||||||
| ``` | ||||||
| </Tab> | ||||||
| <Tab value="Pro (PythLazer)"> | ||||||
| ```solidity copy | ||||||
| uint fee = pythLazer.verification_fee(); | ||||||
| (bytes memory payload, ) = pythLazer.verifyUpdate{value: fee}(update); | ||||||
| // Parse payload sequentially — see full guide | ||||||
| ``` | ||||||
| </Tab> | ||||||
| </Tabs> | ||||||
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| ### Key EVM differences | ||||||
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| | Aspect | Core | Pro | | ||||||
| | ---------------- | ---------------------------------------- | ---------------------------------------------------------------------------------------------------------------- | | ||||||
| | Solidity interface | `IPyth` | `PythLazer` | | ||||||
| | Fee method | `getUpdateFee(bytes[])` | `verification_fee()` | | ||||||
| | Update method | `updatePriceFeeds{value}(bytes[])` | `verifyUpdate{value}(bytes)` | | ||||||
| | Read pattern | `getPriceNoOlderThan(bytes32, uint)` | Sequential parsing: `parsePayloadHeader` → `parseFeedHeader` → `parseFeedProperty` → `parseFeedValueUint64` | | ||||||
| | Feed ID type | `bytes32` | `uint32` | | ||||||
| | Flow | Update, then read (two steps) | Verify, parse, and use (single flow) | | ||||||
| | SDK package | `@pythnetwork/pyth-sdk-solidity` | Pyth Lazer Solidity SDK | | ||||||
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| <Callout type="warning"> | ||||||
| You **must** pass the `pos` cursor returned by each parsing call to the next | ||||||
| call sequentially. Skipping any parsing step will cause incorrect results. | ||||||
| </Callout> | ||||||
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| See the [full EVM integration guide](./integrate-as-consumer/evm) and the [pyth-lazer-example-evm](https://github.com/pyth-network/pyth-examples/tree/main/lazer/evm) example. | ||||||
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| ## SVM (Solana) Migration | ||||||
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| On Solana, **Pyth Pro** uses the **Pyth Lazer program** instead of the Pyth Solana Receiver. The verification mechanism changes from Wormhole VAA to SVM's native ed25519 program, and price data no longer requires separate accounts. | ||||||
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| <Tabs items={["Core (Solana Receiver)", "Pro (Pyth Lazer)"]}> | ||||||
| <Tab value="Core (Solana Receiver)"> | ||||||
| ```rust copy | ||||||
| use pyth_solana_receiver_sdk::price_update::PriceUpdateV2; | ||||||
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| pub price_update: Account<'info, PriceUpdateV2>, | ||||||
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| let price = ctx.accounts.price_update | ||||||
| .get_price_no_older_than(&Clock::get()?, max_age, &price_feed_id)?; | ||||||
| ``` | ||||||
| </Tab> | ||||||
| <Tab value="Pro (Pyth Lazer)"> | ||||||
| ```rust copy | ||||||
| use pyth_lazer_solana_contract::*; | ||||||
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| invoke(&verify_instruction, &[lazer_storage, treasury, fee_payer])?; | ||||||
| let message = PayloadData::deserialize_slice_le(&verified.payload)?; | ||||||
| // Access: message.feeds, message.timestamp, etc. | ||||||
| ``` | ||||||
| </Tab> | ||||||
| </Tabs> | ||||||
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| ### Key SVM differences | ||||||
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| | Aspect | Core | Pro | | ||||||
| | ---------------------- | --------------------------------------------------------------- | ---------------------------------------------------------- | | ||||||
| | Rust crate | `pyth-solana-receiver-sdk` | `pyth-lazer-solana-contract` | | ||||||
| | TypeScript SDK | `@pythnetwork/hermes-client` + `@pythnetwork/pyth-solana-receiver` | `@pythnetwork/pyth-lazer-sdk` | | ||||||
| | Verification | Wormhole VAA via Solana Receiver | Ed25519 via SVM native program | | ||||||
| | On-chain program | Pyth Solana Receiver | `pytd2yyk641x7ak7mkaasSJVXh6YYZnC7wTmtgAyxPt` | | ||||||
| | Compute cost | Higher (Wormhole VAA verification) | ~15K CU (supports 20 feeds per tx) | | ||||||
| | Account model | `PriceUpdateV2` accounts (must create/manage) | No price accounts — data passed in instruction | | ||||||
| | Feed ID type | `bytes32` hex | `uint32` numeric | | ||||||
| | Transaction complexity | May require multiple transactions | Single transaction | | ||||||
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| <Callout type="warning"> | ||||||
| Pyth Pro uses SVM's native **ed25519 program** for signature verification. | ||||||
| This program **cannot** be invoked via CPI — you must include the ed25519 | ||||||
| instruction explicitly in the transaction alongside your program instruction. | ||||||
| See the [SVM integration guide](./integrate-as-consumer/svm) for details. | ||||||
| </Callout> | ||||||
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| See the [full SVM integration guide](./integrate-as-consumer/svm) and the [pyth-lazer-example-solana](https://github.com/pyth-network/pyth-examples/tree/main/lazer/solana) example. | ||||||
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| ## TypeScript SDK Migration | ||||||
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| <Tabs items={["Core (Hermes)", "Pro (Lazer SDK)"]}> | ||||||
| <Tab value="Core (Hermes)"> | ||||||
| ```ts copy | ||||||
| import { HermesClient } from "@pythnetwork/hermes-client"; | ||||||
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| const hermes = new HermesClient("https://hermes.pyth.network"); | ||||||
| const updates = await hermes.getLatestPriceUpdates([priceFeedId]); | ||||||
| ``` | ||||||
| </Tab> | ||||||
| <Tab value="Pro (Lazer SDK)"> | ||||||
| ```ts copy | ||||||
| import { PythLazerClient } from "@pythnetwork/pyth-lazer-sdk"; | ||||||
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| const client = await PythLazerClient.create({ | ||||||
| urls: [ | ||||||
| "wss://pyth-lazer-0.dourolabs.app/v1/stream", | ||||||
| "wss://pyth-lazer-1.dourolabs.app/v1/stream", | ||||||
| "wss://pyth-lazer-2.dourolabs.app/v1/stream", | ||||||
| ], | ||||||
| token: accessToken, | ||||||
| }); | ||||||
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| client.subscribe({ | ||||||
| type: "subscribe", | ||||||
| subscriptionId: 1, | ||||||
| priceFeedIds: [1, 2], // uint32 numeric IDs | ||||||
| properties: ["price", "bestBidPrice", "bestAskPrice"], | ||||||
| formats: ["solana"], // or ["evm"] | ||||||
| channel: "fixed_rate@200ms", // or "real_time", "fixed_rate@50ms" | ||||||
| }); | ||||||
| ``` | ||||||
| </Tab> | ||||||
| </Tabs> | ||||||
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| ## Migration Checklist | ||||||
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| <Steps> | ||||||
| <Step> | ||||||
| ### Get your access token | ||||||
| Request authenticated credentials from a [Pyth Data Distributor](./acquire-access-token). You'll receive a Bearer token for API authentication. | ||||||
| </Step> | ||||||
| <Step> | ||||||
| ### Update your off-chain SDK | ||||||
| Replace `@pythnetwork/hermes-client` with `@pythnetwork/pyth-lazer-sdk`. See [Subscribe to Prices](./subscribe-to-prices) for the full setup guide. | ||||||
| </Step> | ||||||
| <Step> | ||||||
| ### Update your smart contracts | ||||||
| **EVM:** Import the Pyth Lazer Solidity SDK. Replace `IPyth` calls with `PythLazer` verification and parsing. See the [EVM guide](./integrate-as-consumer/evm). | ||||||
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| **SVM:** Switch from `pyth-solana-receiver-sdk` to `pyth-lazer-solana-contract`. Add the ed25519 instruction to your transaction. See the [SVM guide](./integrate-as-consumer/svm). | ||||||
| </Step> | ||||||
| <Step> | ||||||
| ### Update price feed IDs | ||||||
| Pyth Pro Price Feed IDs are different from Pyth Core Price Feed IDs. You can find the complete list of Price Feed IDs in the [Price Feed IDs](/price-feeds/pro/price-feed-ids) page. | ||||||
| </Step> | ||||||
| <Step> | ||||||
| ### Configure your subscription | ||||||
| Set your preferred `channel` (`real_time`, `fixed_rate@200ms`, `fixed_rate@50ms`), `properties`, and `formats` in your WebSocket subscription message. | ||||||
| </Step> | ||||||
| <Step> | ||||||
| ### Test your integration | ||||||
| Use the example repos to validate: | ||||||
| - [pyth-lazer-example-evm](https://github.com/pyth-network/pyth-examples/tree/main/lazer/evm) for EVM | ||||||
| - [pyth-lazer-example-solana](https://github.com/pyth-network/pyth-examples/tree/main/lazer/solana) for Solana | ||||||
| - [pyth-lazer-example-js](https://github.com/pyth-network/pyth-examples/tree/main/lazer/js) for the WebSocket SDK | ||||||
| </Step> | ||||||
| </Steps> | ||||||
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| <Callout type="error"> | ||||||
| **Never expose your access token in frontend code.** Use it only in secure | ||||||
| backend environments. Exposing it in client-side code is a violation of the | ||||||
| Terms of Service. | ||||||
| </Callout> | ||||||
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Pro doesn't have "confidence interval" like core