APIs for AI agents

Anthropic

AI safety company and maker of Claude; the Claude API gives programmatic access to Claude models and Claude Managed Agents.

ai models · Developer tools

Brave Search API

Independent web search API for developers and AI agents: web, news, images, LLM context and answers.

Research and knowledge · Developer tools

Lemon Squeezy

Merchant of Record platform for software and digital products, with a REST API for stores, products, orders, subscriptions and checkouts.

Commerce · Finance and economic data · Developer tools

Plaid

Financial data network and API for connecting bank accounts to apps, with an API, a CLI and a remote MCP server.

Finance and economic data · Developer tools

SendX

Email marketing software for campaigns, list building, and marketing automation.

email marketing · analytics · developer API

Twilio

Communications platform with APIs for SMS, voice, WhatsApp, email and verification, plus a command-line interface.

Communications · Developer tools

Vonage

Communications APIs for messaging, voice, video, verification and identity.

Communications · Developer tools

OpenRouter

Unified API and MCP server for accessing many AI models from different providers.

Developer tools · ai models

Financial Datasets

Financial Datasets provides financial and market data through an API. Its income-statements operation retrieves financial statements for a stock ticker.

Finance and economic data · market data · API

Mail.tm

Mail.tm provides a temporary email REST API for creating mailbox accounts and receiving messages.

Communications · api · communication

PDFTables

PDF table extraction and conversion service with an API for processing PDFs into spreadsheet formats.

PDF conversion · data extraction · developer API

Sender

Sender provides email marketing and subscriber management with a REST API for reading subscriber records from an account.

email marketing · API

Dog API

An open-source collection of dog pictures with a public JSON API for retrieving images and breed information.

vatcheckapi.com

vatcheckapi.com provides a JSON REST API for validating VAT numbers and retrieving company registration details from official registries. This operation checks a VAT number.

business-data · tax · validation · api

SpherePay

SpherePay is an API-first platform for on-ramp and off-ramp transfers between fiat currencies and stablecoins, with built-in customer compliance flows.

Finance and economic data · Developer tools

WhatsOnChain

WhatsOnChain is a Bitcoin SV blockchain explorer with a REST API for BSV chain data. This interface retrieves mainnet chain information.

blockchain · cryptocurrency · API

eSignatures.com

eSignatures.com provides electronic signature workflows and a REST API for querying contract content.

electronic signatures · API

LinkPreview

LinkPreview returns a webpage's title, description and preview image as JSON through a GET or POST API, authenticated with a free API key.

Developer tools · api · web-content

Deepgram

Voice AI platform with speech-to-text, text-to-speech and voice agent APIs, plus a CLI with a built-in MCP server.

ai models · Developer tools · Media and entertainment

Cloudflare

Global network and developer platform for CDN, security, DNS and serverless Workers, with a REST API and the Wrangler CLI.

Developer tools · Hosting and deployment

Redpanda

Redpanda Cloud provides a Control Plane API that lists clusters belonging to a Redpanda Cloud organization.

cloud infrastructure · data streaming · API

Open Library

Open book catalog with JSON APIs for searching books, authors, covers and editions.

Research and knowledge · Media and entertainment

Gigasheet

Gigasheet provides a data analysis application and API. Its User info API endpoint returns the username associated with the request authorization and whether the request is authenticated.

data analysis · spreadsheets · API

data.gov.sg

Singapore government open-data portal with APIs for public datasets and real-time environmental readings.

Public data · environmental data