APIs for AI agents

Retell AI

Retell AI is a platform for building voice agents that make and receive phone calls. Its REST API creates outbound calls and manages agents, phone numbers and calls.

voice · telephony

ReqRes

A hosted REST API and backend testing platform with persistent sample collections, user sessions, request logs, and QA automation scenarios.

Developer tools · testing · api

WhichTrim Vehicle Data API

Machine-readable vehicle records including model-year data, recalls, complaints, crash ratings and comparison results, with filters for searching vehicle records.

vehicle data · automotive · API

APIVerve

APIVerve is an API platform with a catalog of utility services, including Email Validator for checking address format, mail-domain records, disposable and role-account status, and deliverability signals.

Developer tools · data-validation · Communications

AMNT

AMNT provides an authenticated API for searching public metadata about live AI agents; listing never spends a credit.

ai-agents · agent-discovery · marketplace · api

Amara

Amara provides a REST API to interact with the site.

subtitles · video captioning · REST API

Ipregistry API

Developer tools

Ip2Geo

Ip2Geo provides a REST API that converts IP addresses into structured geolocation data.

ip-geolocation · Maps and geospatial data · Developer tools

When I Work

When I Work provides employee scheduling and time and attendance software with an API for account data.

workforce-management · Productivity and collaboration · API

AShareHub

AShareHub provides Chinese A-share market data through REST API, Python SDK and MCP, including daily stock-price data.

Finance and economic data · stock market data

Loreboard

A fan directory for Lorcana resources with an anonymous read-only MCP server and filterable public resource search.

Research and knowledge · search · mcp · gaming

HeyGen

Generate AI videos by sending a prompt to the Video Agent API.

Video · AI

SearchPinCode

HTTPS JSON API for looking up Indian postal PIN codes and their post offices.

postal · location · Public data

awork

awork is a project management platform with an API for listing projects visible to the authenticated user.

project-management

tawk.to

tawk.to provides live-chat and customer-support software with a REST API for managing account resources and retrieving account information.

customer-support · live-chat · api

sqlai.dev

SQL verification service for AI agents: run_sql checks SQL against a fresh ephemeral SQLite database and returns actual rows, typed errors, query plans or result-set differences.

Databases · Developer tools · ai-agents

Omise

Omise is a payment platform with a REST API. Its Charges API can retrieve a charge by its ID; this path uses the read-only GET operation and can be used with a test key in the test dashboard.

Finance and economic data · Commerce · Developer tools

Mailisk

Mailisk provides email and SMS testing services with API-accessible inbox namespaces.

Developer tools · email-testing · testing

Smallest AI

Skrapp

Skrapp provides an API for business email discovery and account data; its account read returns the API plan, remaining credits, and lists.

business data · email enrichment · REST API

Pushover

Send notification messages to Pushover users or groups from applications through a token-authenticated HTTP API.

communication

Zoho CRM

Zoho CRM provides customer relationship management, including creating and managing lead records through its CRM API.

Productivity and collaboration · business

Mindola

A digital-twin platform whose hosted MCP interface can report the status and knowledge counts of an existing lens.

Digital twin · MCP

JobDataLake

Developer API for searching enriched job listings, with a free API key tier and per-request credits.

jobs · Public data · api