Deprecated RPC API Method Migration

Replace deprecated getProgramAccounts calls for token account discovery with getTokenAccountsByOwner. The old method scans the entire account index, causing excessive load on RPC nodes and frequent rate limiting. The new method uses the Token Program's internal index for O(1) lookup. Update wallet backends, portfolio trackers, and DeFi frontends to filter by mint address rather than fetching all token accounts and filtering client-side. Chainscore can audit your codebase for deprecated getProgramAccounts usage and build a prioritized migration roadmap.

The getConfirmedBlock method is fully replaced by getBlock, which uses the same parameters but returns additional transaction detail and commitment-level control. Indexers, block explorers, and analytics pipelines must update their ingestion code to handle the enriched response schema, including rewards arrays and loadedAddresses for address table lookups. The old method will return errors after deprecation. Chainscore can review your block ingestion pipeline for compatibility gaps and test against the new response format.

Migrate from getConfirmedSignaturesForAddress2 to getSignaturesForAddress before the deprecated method is removed. The replacement uses identical parameters but returns a cleaner response structure with explicit err fields instead of confirmationStatus ambiguity. Wallets displaying transaction history, compliance tools tracking address activity, and custody platforms reconciling deposits must update their parsing logic. Test against both confirmed and failed transactions to ensure your error-handling code handles the new schema correctly.

Replace getConfirmedTransaction with getTransaction, which supports the maxSupportedTransactionVersion parameter for handling legacy and versioned transactions in a single call. Exchanges processing deposits, bridge validators verifying inbound transfers, and accounting systems reconciling on-chain activity must update their transaction parsing to handle both transaction.message (legacy) and transaction.transaction.message (versioned) response shapes. Chainscore can build integration tests that validate your parsing logic against both transaction formats.

The getRecentBlockhash method returns a blockhash valid for only ~60 seconds and lacks the lastValidBlockHeight field needed for durable transaction submission. Migrate to getLatestBlockhash, which returns both the blockhash and the block height at which it expires. Wallets, dApp frontends, and automated transaction senders must update their retry logic to use lastValidBlockHeight for expiry checks rather than time-based heuristics. This prevents transactions from being silently dropped during congestion.

Start with the official Solana RPC documentation to confirm which methods are current, which are marked deprecated, and what replacement methods should be used. Migration work should compare request parameters, response shape, commitment handling, pagination behavior, and error semantics rather than only renaming methods. For example, legacy confirmed-era calls often map to newer finalized or commitment-aware methods, but downstream indexers, wallets, and exchange deposit systems should verify that their confirmation assumptions still match business requirements.

RPC deprecations become operationally relevant when validator and RPC node software changes behavior, logs warnings, or removes legacy paths. Teams running private RPC infrastructure should monitor Agave release notes for RPC-related breaking changes, feature gates, default configuration changes, and performance regressions affecting high-volume methods. Treat release notes as the source for deployment planning, but validate behavior against your own node version because hosted RPC providers may roll out removals or compatibility shims on different schedules.

When documentation is ambiguous, inspect the Agave source to understand the server-side behavior of a method: parameter validation, commitment defaults, response serialization, error codes, and deprecated aliases. This is especially useful for exchanges, custodians, analytics platforms, and RPC gateways that need deterministic compatibility tests. Source review should be paired with live-node testing because provider middleware, caching layers, and load balancers can change observable behavior even when the underlying client implementation is unchanged.

Applications using JavaScript or TypeScript should review their @solana/web3.js dependency for deprecated helper methods, renamed RPC wrappers, and changed return types. A safe migration includes static search for deprecated calls, dependency version review, unit tests against both old and new RPC responses, and integration tests against the target RPC provider. Wallets and frontends should also verify error handling because deprecated method removal often surfaces first as runtime JSON-RPC errors rather than compile-time failures.