Exchange and Custodian Integration Test Suite

The Exchange and Custodian Integration Test Suite provides a canonical checklist for validating core operational workflows—transaction construction, signature verification, balance reconciliation, and deposit address monitoring—against specific Starknet client releases. Integration teams use this suite to certify that their Starknet support remains correct and reliable after upgrading Pathfinder, Juno, or Papyrus nodes, or when adapting to new JSON-RPC specification versions. The suite is designed to catch regressions in fee estimation, nonce management, and event parsing that commonly break exchange pipelines during network upgrades.

Key validation vectors include constructing and broadcasting invoke and declare transactions with correct fee parameters derived from starknet_estimateFee, verifying secp256k1 and secp256r1 signature schemes against the native account abstraction model, and reconciling on-chain ERC-20 balance states with internal ledger entries using starknet_getStorageAt and event log filtering. Deposit monitoring tests validate that starknet_getEvents and WebSocket subscriptions reliably detect inbound transfers to generated deposit addresses without gaps or duplicates, a critical requirement for maintaining solvency in custodial operations. Each test case maps to a specific RPC method and client version, allowing teams to isolate failures to a particular software component.

Operators should execute this test suite against a staging environment running the target client version before promoting it to production. The suite complements the Pre-Release Testing and Staging Environments and Client Compatibility Matrix pages, which define the infrastructure setup and version alignment required for valid testing. Teams managing disaster recovery procedures should also validate that backup and restore operations do not corrupt the state required for balance reconciliation, as documented in the Backup, Restore, and Disaster Recovery Procedures page. Chainscore Labs can execute this integration test suite on behalf of exchange and custodian teams, providing a formal certification report that confirms operational readiness and identifies any compatibility gaps before a production upgrade.

The integration surface for an exchange or custodian on Starknet extends far beyond a simple balance query. It encompasses the full lifecycle of a deposit, from monitoring for Transfer events on the correct token contract to verifying sufficient block confirmations against the canonical chain. The critical path for a withdrawal involves constructing a valid INVOKE transaction with accurate fee estimation via starknet_estimateFee, managing account nonce ordering to prevent sequence gaps, and submitting the transaction to a reliable RPC endpoint. Each of these touchpoints—event subscription, transaction simulation, fee market behavior, and RPC method compatibility—represents a potential failure mode that the integration test suite is designed to systematically validate against a specific Starknet client release.

A core operational risk lies in the mismatch between transaction simulation and on-chain execution. The test suite must verify that a transaction simulated via starknet_simulateTransactions produces the same fee consumption and state changes as one submitted to the live network. This is particularly sensitive to changes in the Blockifier transaction executor, where a new release could alter fee calculation logic or Cairo VM gas metering, causing simulated transactions to succeed while actual invocations fail. For custodians, the test vectors for signature verification are equally critical, ensuring that the signing logic for Starknet's native account abstraction—which differs fundamentally from Ethereum's ECDSA model—produces valid signatures that the sequencer will accept under the current protocol rules.

The operational checklist must also cover the monitoring surface: verifying that WebSocket subscriptions for new block headers and pending transactions remain stable under load, and that the event log filtering correctly identifies deposit transactions without false positives from non-standard token implementations. The integration test suite serves as a certification gate, allowing an operations team to assert that their Starknet integration is compatible with a target client version and JSON-RPC specification revision before deploying to production. Chainscore Labs can execute this test suite against a team's specific infrastructure, providing a certification report that validates transaction construction, signature handling, balance reconciliation, and deposit monitoring against the canonical Starknet protocol behavior.