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APIs/Finance

Finance APIs

Explore APIs in this category. Connect any of them to your AI agent through Jentic.

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Plaid The Plaid API

Connect applications to users' bank accounts for account verification, transaction history, and identity data across 12,000+ financial institutions. Plaid handles OAuth flows, credential rotation, and multi-factor authentication with each institution, returning normalised data through a single interface. Supports real-time balance checks, recurring transaction detection, and income verification workflows.

Xero Accounting API

Record and reconcile financial transactions, generate invoices, track payments, and produce financial reports for small and medium businesses. The API exposes 237 endpoints covering accounts, contacts, invoices, bank transactions, journals, and reporting - enabling full double-entry bookkeeping through programmatic access. Supports multi-currency transactions, tax calculations, and attachment management on all document types.

Avalara AvaTax API

The Avalara AvaTax API is a REST interface to Avalara's enterprise tax engine for calculating sales, use, VAT, and GST on transactions across US and international jurisdictions. It manages companies, locations, nexus declarations, exemption certificates, returns filing, and audit trails alongside real-time transaction calculation. Authentication uses HTTP Basic with an account ID and license key, and the spec exposes 432 operations across 314 paths, including a sandbox at sandbox-rest.avatax.com.

bunq API

The bunq API is the public banking API for bunq, a European mobile bank, covering monetary accounts, payments, scheduled payments, cards, attachments, bunq.me payment requests, currency conversion, and a large surface of user, device, and session management endpoints. It supports both a sandbox environment at public-api.sandbox.bunq.com and the production environment at api.bunq.com. Authentication uses bunq's installation-and-session model - register an installation, register a device-server, then create a session to obtain a session token used for API calls.

SoftLedger Accounting API v2

SoftLedger provides real-time visibility to critical financial data. Our cloud-native accounting software and APIs help organizations manage their distributed operations and assets. This includes a full-featured general ledger, accounts receivable, accounts payable, inventory management, crypto asset management, and more. The API exposes 375 endpoints secured with oauth2 authentication.

Binance Public Spot API

The Binance Public Spot API is the programmatic interface to Binance's spot exchange, exposing 340 endpoints covering market data, spot trading, margin, sub-accounts, savings, futures-related lookups, fiat on-ramps, C2C, NFT, and Binance Pay. It supports the standard exchange order lifecycle - place, query, cancel, list - with order types including market, limit, OCO, OTO, and SOR-routed orders, plus margin borrow and repay, isolated and cross margin, and account information lookups. Authentication is by API key in the X-MBX-APIKEY header for trading and account endpoints, with HMAC-SHA256 request signing required for signed endpoints.

Invoice Ninja

Jentic publishes the only available OpenAPI specification for Invoice Ninja, keeping it validated and agent-ready. Invoice Ninja is an open-source invoicing, billing, and time-tracking platform that lets businesses issue invoices, accept online payments, manage clients, and reconcile bank transactions. The API exposes 331 endpoints covering invoices, quotes, recurring invoices, credits, payments, expenses, projects, tasks, vendors, bank integrations, and webhooks. It is built for service businesses, freelancers, and agencies that want to run their full quote-to-cash workflow programmatically.

Buildium API

Jentic maintains a validated, agent-ready OpenAPI specification for Buildium API. Buildium is a property management platform from RealPage that handles rental properties, homeowner associations, leases, tenants, owners, vendors, maintenance work orders, communications, and a full accounting ledger. Across 326 endpoints the API exposes every record an operator touches in the dashboard, from lease transactions and bill payments to applicant pipelines and bank reconciliations. Use it to sync Buildium with custom landlord portals, push financial data into BI, automate tenant onboarding, or drive maintenance scheduling.

Payabli Payments API

Accept and disburse payments through a comprehensive payment infrastructure platform. Payabli enables software companies to embed payment capabilities including card and ACH processing, subscriptions, payouts, invoicing, and merchant onboarding. The API provides full-lifecycle payment operations from authorization to settlement, with support for customers, vendors, and recurring billing.

Increase API

Increase is a programmatic banking platform that exposes the underlying U.S. financial network through a REST API, including the Federal Reserve, Visa, ACH, real-time payments, wires, and check rails. The API spans 199 endpoints covering accounts, account numbers, account transfers, ACH transfers, wire transfers, real-time payment transfers, check transfers, inbound check deposits, cards, card disputes, physical card profiles, digital wallet tokens, and entity onboarding for KYC. Webhook event subscriptions deliver settlement, return, and decline notifications, and the simulations endpoints let teams reproduce wire returns or ACH NSF events in sandbox before production.

Biapi Pro Budgea API

The Budgea API by Powens (formerly Budget Insight) is an open banking aggregation platform covering PSD2-regulated bank connections, account information, transaction history, payment initiation, and personal finance management features. Agents can connect end users to French and European banks, retrieve normalised transaction feeds, categorise spending, and trigger SEPA payments. The spec exposes 167 endpoints across banking connectors, accounts, transactions, categories, users, webhooks, and document-based wealth aggregation. Authentication relies on JWT tokens minted from /auth/jwt and user access tokens minted from /auth/token.

MX Platform API

The MX Platform API aggregates financial data from tens of thousands of financial institutions and enriches it with categorization, merchant matching, and account verification. It covers user and member management, account and transaction sync, microdeposits, ACH return handling, managed institution data, transaction rule engines, tax document retrieval, and embeddable widget URLs. The 166 endpoints span the full lifecycle from connecting a user's bank to producing categorized, merchant-resolved transaction streams.

Portfolio Optimizer

Portfolio Optimizer is a quantitative finance API offering 158 endpoints for analyzing and optimizing investment portfolios. It covers modern portfolio theory (mean-variance optimization, maximum Sharpe ratio, minimum variance), risk analysis (Value-at-Risk, Conditional VaR), asset correlation and covariance matrix estimation, hierarchical clustering, Monte Carlo simulation, factor models (Fama-French), and capital market assumptions. The API supports up to 100 assets and 2500 data points per authenticated request.

Codat Accounting API

Codat's Accounting API provides a unified interface for reading and writing accounting data across 20+ accounting platforms including QuickBooks, Xero, Sage, NetSuite, and FreeAgent. It standardises invoices, bills, journal entries, customers, suppliers, payments, and financial reports so a single integration maps to all supported systems. The API supports both pull operations (read normalised data from a linked company) and push operations (create or update records back into the source ledger). It is designed for fintech applications, lending platforms, and B2B SaaS products that need accounting data from their customers' books.

Alpaca Broker API

The Alpaca Broker API lets businesses open and manage brokerage accounts and offer stock, options, and crypto trading to their end users under their own brand. It covers the full account lifecycle including onboarding, KYC and CIP, ACH and bank relationship setup, funding wallets, journals between accounts, trading on behalf of accounts, watchlists, corporate actions, and rebalancing portfolios. The API uses HTTP basic authentication for server-to-server calls and exposes both production and sandbox endpoints. With 131 endpoints, it is the broadest of Alpaca's three APIs and is intended for fintechs building branded investing products.

Blockfrost.io ~ API Documentation

Jentic publishes the only available OpenAPI specification for Blockfrost.io, keeping it validated and agent-ready. Blockfrost is a hosted Cardano backend that exposes accounts, addresses, native assets, blocks, epochs, governance records, mempool state, pool data, scripts, transactions, and metadata across mainnet, preprod, and preview networks. It also includes IPFS pinning endpoints for storing off-chain content alongside Cardano transactions. Authentication uses a per-project header token, and a single project is scoped to one network.

Stax API

stax.com/main version 1.0.0. The API exposes 122 endpoints.

Big Red Cloud API

Big Red Cloud is an Irish small-business accounting platform, and its REST API exposes the full ledger model - customers, suppliers, sales and purchase invoices, cash payments and receipts, bank accounts, and nominal accounts - across 120 endpoints under /v1. The API supports list, single-item, and batch operations for most resources, plus dedicated endpoints for sending sales invoices, statements, and quotes by email. Authentication is by API key generated from the user's Big Red Cloud account, scoping access to that company's books. Suitable for syncing accounting data with e-commerce platforms, payment processors, or custom reporting tools.

bexio API

The bexio API provides programmatic access to Switzerland's leading SME business management and accounting platform, covering contacts, invoices, quotes, orders, deliveries, products, projects, time tracking, and accounting ledgers. Agents can create and manage invoices in CHF, EUR and other currencies, track payments, sync product catalogues, and book accounting entries. The API uses OAuth bearer tokens and supports the full quote-to-cash workflow used by Swiss small businesses. Rate limits and idempotency depend on the bexio plan tier.

Finnhub API

Jentic publishes the only available OpenAPI specification for Finnhub API, keeping it validated and agent-ready. Finnhub is a real-time financial data API providing institutional-grade market data, fundamentals, alternative data, and news for global stocks, forex, crypto, bonds, ETFs, and economic indicators. Coverage spans 60+ exchanges with company financials, earnings calendars, insider transactions, analyst estimates, sentiment scores, and an AI Copilot endpoint for natural-language financial queries. The 108 endpoints make it suitable for trading research, portfolio analytics, and agent-driven market intelligence pipelines.

Linkcy API

Overview This is the partner API from [linkcy](https://linkcy.io/). Here you can find our API documentation. LinkCy API allows you to create fully embedded banking products for your own company or consumers. This API is backed by all mandatory requirements by financial authorities. To process, information provided into the API must be accurate. Authentication You can obtain a LinkCy Authorization . The API exposes 102 endpoints secured with bearer authentication.

Rillet Accounting API

rillet.com/main version v3.0. The API exposes 100 endpoints secured with bearer authentication.

E Conomic Visma e-conomic OpenAPI

Visma e-conomic is a Nordic cloud accounting platform whose v20 REST API exposes activities, activity groups, cost types, employees and employee groups, mileage entries and prices, project activities, and project customers. Built for ISVs integrating expense, project costing, and time-tracking flows into e-conomic books, the API is paginated by /paged endpoints and authenticated with a per-agreement grant token plus an app secret token. Visma publishes its own OpenAPI document for this Projects surface and that document is canonical; it is linked in the FAQ below. This page describes a curated, agent-optimized Jentic specification of the same 98 operations, kept validated so agents can discover and execute them through the Jentic API Directory.

Apideck Accounting API

Apideck Accounting is a unified API that maps a single schema for invoices, bills, payments, ledger accounts, customers, suppliers, and tax rates onto many downstream accounting platforms such as Xero, QuickBooks, Sage, NetSuite, and FreshBooks. The 95 operations cover the day-to-day finance objects most apps need plus reports like Balance Sheet, Profit and Loss, and Aged Debtors. Apideck routes each call through Apideck Vault, so customer credentials for the underlying platform stay in Apideck's vault instead of being passed in by the calling app.

Faktoora e-Invoicing API

Jentic publishes the only available OpenAPI specification for Faktoora e-Invoicing API, keeping it validated and agent-ready. Faktoora is a European electronic invoicing platform that creates, validates, and exchanges invoices in compliance with the EN16931 standard, including XRechnung, ZUGFeRD, and Peppol formats required for B2G and B2B e-invoicing across the EU. The 87-endpoint API covers outgoing and incoming invoices, structured invoice import with validation, customer and product catalogues, product bundles, and webhooks for real-time invoice status events.

Nem Catapult REST Endpoints

The Catapult REST API is the public HTTP interface for nodes running the Symbol blockchain (the protocol born from the NEM ecosystem). It exposes 81 endpoints covering accounts, blocks, transactions, mosaics, namespaces, finalisation, and node and network metadata, so a client can query chain state, broadcast signed transactions, and watch finality progress without running its own node. The API is designed for wallets, explorers, and back-office services that need a read and submit interface to the Symbol chain.

Bill Organization | Accounts tracking

Jentic publishes the only available OpenAPI specification for Organization | Accounts tracking, keeping it validated and agent-ready. This BILL surface manages the accounting dimensions an organisation uses to classify every transaction: chart of accounts, accounting classes, departments, employees, items, jobs, locations, and payment terms. Agents create, update, and bulk-load these tracking entities so that invoices, bills, and payments downstream can be coded against the correct ledger, cost centre, and project. Without this layer, AR and AP records cannot be reconciled to the underlying accounting system.

Qonto API

Qonto business banking, invoicing and expense management API. The API exposes 73 endpoints secured with oauth2 authentication.

Sandbox Api Starkbank Stark Bank API

Stark Bank API for financial services in Brazil. The API exposes 72 endpoints.

Keeper App Double API

The Double API (the public API for Keeper, the bookkeeping platform) gives bookkeepers and accounting firms programmatic access to clients, branches, files, contacts, assignments, end-of-period closes, and the activity log. The 69 endpoints cover reading and updating the client roster, navigating branch hierarchies, and pulling the audit trail used to track who did what across a practice. Authentication is OAuth2 client credentials - clients exchange a client_id and client_secret at the OAuth token endpoint for a 24-hour bearer token, then attach it to every request. Rate limits are 300 requests per OAuth client per 5-minute window.

Griffin The Griffin API

Griffin is a UK banking-as-a-service provider, and the Griffin API is the resource-oriented REST surface that exposes its banking operations. Agents can open and close bank accounts, manage legal persons (KYC subjects), submit and track payments, query transactions, look up Companies House data, run Admissions and Submissions for onboarding, and manage API keys. The API is structured as a tree under your organization with navigation links in every response and uses an Authorization header containing a Griffin-issued API key.

EODHD Financial Data API

Jentic publishes the only available OpenAPI specification for EODHD Financial Data API, keeping it validated and agent-ready. EODHD provides end-of-day prices, intraday data, fundamentals, dividends, splits, earnings calendars, news with sentiment, screening, technical indicators, macroeconomic indicators, and ESG data across more than 70 stock exchanges. The API exposes 68 REST endpoints organised around price history, company fundamentals, calendar events, screening, and reference data so agents can pull market data on demand. Authentication is by API token passed as a query parameter, and most responses are JSON suitable for downstream analysis.

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