Wallet API

Overview

Meaning and scope

A wallet API lets software create, query, sign, send, or monitor wallet-related accounts, addresses, balances, tokens, and transactions programmatically. Wallet API returning an accepted or successful response proves only the documented API state; payment, payout, refund, settlement, or ledger completion may require later verification.

Mechanism and operation

Transactions need stable intent records, receipt and finality tracking, monitoring, and reconciliation against wallet and ledger balances. Integrators should document who controls keys, isolate credentials, use least privilege, verify network and destination, and apply approvals, limits, and idempotency. A leaked key with transfer authority can cause immediate loss, while balance data may be stale or wrong-chain. Data modeling for Wallet API should use stable identifiers, explicit timestamps and timezones, documented decimal and currency rules, nullable-field semantics, enumerated statuses, and immutable historical references. Custodial APIs may hold keys and authorize transfers, while noncustodial interfaces expose public data or request user signatures from an external wallet.

Practical payment example

A payment application requests a transaction signature through a wallet API. It presents human-readable chain, recipient and amount details before authorization, and treats a rejected signature as an expected outcome.

Operational checks

Blind retries, weak destination checks, and unclear finality handling create additional transaction hazards. Some APIs also manage policies, webhooks, fees, and address generation. The Wallet API contract should define identifiers, validation, authorization, status semantics, errors, limits, and version behavior at the same boundary. Testing Wallet API should cover malformed input, denied access, rate limits, timeouts, duplicates, asynchronous completion, and version changes.

Distinctions and limits

A successful transport result from Wallet API should not be interpreted beyond the exact API state documented by the provider. The Wallet API owner should publish stable error semantics and guidance on whether correction, retry, status lookup, or escalation is appropriate.

Related reading

Related definitions: reconciliation.