Integration connects institutional applications to network capabilities through agreed interfaces. EVM RPC provides a standard path for compatible clients to read network state and submit signed transactions. Wallet, contract, event, API, or SDK components may also form part of a scoped design. The presence of familiar EVM interfaces does not mean a bank’s core systems are already connected or that an institution-specific connector is included.
Teams should distinguish three layers: the banking application that owns the customer workflow, the integration components that prepare and observe network requests, and the banking network that executes eligible transactions. This separation clarifies who authenticates users, who signs, where policies are checked, how failures are handled, and which team reconciles network evidence with the institution’s own books and obligations.
Choose interfaces around the application boundary
RPC is the network-facing interface for compatible EVM operations. A banking application or integration service can use it to read supported chain information and relay a properly prepared transaction. Wallet and contract tooling help create or authorize application requests according to the institution’s chosen design. Endpoint access, credentials, network environments, and operational limits are agreed during technical onboarding.
An SDK is a software package that can simplify use of documented interfaces for a particular development environment; it is not itself a banking system or a guarantee of business workflow coverage. Use only the packages and documentation supplied for the agreed deployment. Avoid designing against imagined convenience methods: confirm the actual interface, version, authentication, error behavior, and support boundary with the implementation team.
Application request to network receipt
- 01Banking applicationCollects the intended operation and applicable customer or operator authorization.
- 02Integration componentsApply the agreed preparation, signing, policy, and submission responsibilities.
- 03RPC and networkRelays an eligible signed request for network processing.
- 04Receipt and eventsProvide network outcome evidence for the application’s subsequent workflow.
Keep integration distinct from the banking core
A network integration handles blockchain-specific concerns such as transaction encoding, signing coordination, RPC communication, receipt interpretation, and supported contract events. The bank’s core banking platform remains the authoritative location for its customer accounts, product rules, financial postings, and business processes unless the institution designs and approves a specific connection to those systems.
Core integration requires discovery of system ownership, available interfaces, data mapping, identity and authorization, exception states, idempotency, operational support, and reconciliation responsibilities. Vendor cooperation and institutional implementation work may be necessary. An API or SDK package does not imply a prebuilt core-banking connector; that work is assessed and scoped for the institution rather than presumed available.
Treat receipts as evidence, then reconcile
A transaction receipt reports the network result associated with a submitted transaction, while supported events may describe relevant contract activity. Applications should persist the identifiers and status information needed for their own processing and investigation. The integration design must define how it handles pending responses, re-submission risks, failures, timeouts, duplicate notifications, and the confirmation policy used by the institution.
A receipt does not perform an off-chain book entry, settle a separate payment obligation, or establish that every internal workflow has completed. Reconciliation compares network activity with institution-maintained records and any other relevant payment or settlement systems. Define matching keys, timing windows, breaks ownership, review evidence, and correction procedures with finance and operations before relying on an automated process.
Integration boundary and system ownership
- Customer or operator workflowInstitution-owned application, identity checks, approvals, and user experience.
- Network integrationAgreed wallet, API, SDK, RPC, contract, and event responsibilities.
- Banking coreInstitution-owned accounts, records, business rules, and financial posting.
- Scoped connectionMapping, controls, exception handling, and ownership defined during discovery.
Make integration scope testable
A useful interface specification records the environments, supported operations, credential handling, signing boundaries, data fields, error cases, event expectations, and escalation contacts relevant to the agreed scope. It should identify what the platform supplies and what the institution or another vendor implements. Security review should cover secrets, network access, least privilege, logging, and the safe handling of transaction data.
Plan validation around representative institution-owned scenarios: accepted and rejected requests, receipt processing, event interpretation, timeout recovery, reconciliation exceptions, and operational handover. Deliverables may include interface documentation, configuration, agreed integration components, and test evidence. They do not guarantee settlement speed, throughput, or end-to-end business completion; capacity and service terms require separate confirmation.