API discoveries

Accounting API (Codat) vs Advicent FactFinder vs Adyen Balance Control vs Adyen BinLookup

A practical comparison of four finance APIs captured on 2026-09-20: Codat's multi-platform accounting normalizer, NaviPlan's Fact Finder access, and Adyen's balance transfer and BIN lookup services.

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Reported Purposes

Codat's Accounting API normalizes and aggregates data from 20 accounting integrations, exposing a uniform CRUD interface across platforms like Xero, QuickBooks, and Sage. The Advicent FactFinder Service provides programmatic access to the NaviPlan Fact Finder, a financial planning data collection tool. Adyen's Balance Control API moves funds between merchant accounts that share a legal entity and company account. Adyen's BinLookup API returns card BIN metadata including cost estimates and 3D Secure version support. All four were observed in the APIs.guru directory on 2026-09-20.

Authentication Models

Codat's spec lists auth as "Unknown" in the directory record. Adyen's Balance Control and BinLookup services both document API key (X-API-Key header) and HTTP Basic authentication, with separate test and live endpoints. BinLookup additionally shows a company-specific live URL prefix pattern ({PREFIX}-pal-live.adyenpayments.com). Advicent's directory entry also shows "Unknown" auth. The Adyen specs include curl examples for both auth methods; the other two specs would need to be inspected directly for their security schemes.

Versioning and Endpoint Structure

Both Adyen APIs use a version suffix in the URL path (format "vXX"), e.g., /BalanceControl/v1/balanceTransfer and /BinLookup/v54/get3dsAvailability. BinLookup's spec version is 54, Balance Control's is 1. Codat's Accounting API is at spec version 2.1.0 with a path structure under /accounting/. Advicent's FactFinder uses /factfinder/v1/ in its Swagger URL. Only the Adyen specs explicitly describe the versioning scheme in their descriptions.

Scope and Data Domain

Codat targets multi-platform accounting data synchronization (chart of accounts, invoices, bills, bank transactions, etc.) across 20+ integrations. Advicent focuses on financial planning fact-finding data collection. Adyen Balance Control handles intra-entity merchant account fund transfers. Adyen BinLookup provides card network intelligence (BIN-to-cost, 3DS version). These are non-overlapping domains: accounting normalization, financial planning input, payment operations, and card metadata respectively.

Limitations and Gaps in Directory Records

Directory metadata marks auth as "Unknown" for Codat and Advicent, leaving their actual security schemes unverified from this source. No rate limits, pagination conventions, or error schemas are captured in the directory descriptions. Adyen's live endpoint requirements (company-specific prefixes, live credentials) are noted but not testable here. Advicent's spec is Swagger 2.0 while the others are OpenAPI 3.x, which may affect tooling compatibility. No SLAs, data residency, or sandbox availability information is present in any record.

Next Evaluation Steps

1) Fetch each OpenAPI/Swagger document to enumerate operations, schemas, and security requirements. 2) For Codat: confirm which 20 accounting platforms are supported and whether write operations are available for all. 3) For Advicent: determine if the FactFinder API is read-only or supports data submission. 4) For Adyen: verify test environment access, webhook support for transfer status, and BIN lookup rate limits. 5) Compare auth implementation details (OAuth flows, key rotation, scopes) across all four. 6) Check for webhook/eventing support in Codat and Adyen for real-time sync.