Feature

Sandbox Environment

A safe test environment with fake data.

53 providers 1558 APIs 33 declared variants

A dedicated sandbox or test mode with synthetic data lets teams build and test without touching production or moving real money. Usually the gate on how fast an integration can be certified.

53 API providers on the APIs.io network offer sandbox environment. The highest-rated are Stripe, Salesforce, Postman, Plaid, Anthropic.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 18 Complete, well-documented, and agent-ready
Stripe Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce f... 159 APIs 84.7 Salesforce Salesforce is a cloud-based customer relationship management (CRM) platform that provides a comprehensive s... 294 APIs 80.1 Postman Postman is the world's leading API platform, used by 35+ million developers to design, build, test, documen... 39 APIs 75.8 Plaid Plaid is a US financial-technology company and data-network aggregator that provides an API platform for bu... 31 APIs 75.2 Anthropic Anthropic is an AI safety company and creator of the Claude family of large language models (Opus, Sonnet, ... 24 APIs 75.0 Avalara Avalara helps businesses of all sizes get tax compliance right. We deliver cloud-based solutions that work ... 73 APIs 75.0 Merge Merge is the connective infrastructure for production AI. The Merge Unified API offers one API surface acro... 118 APIs 73.4 Apidog Apidog is an all-in-one API development platform that connects the entire API lifecycle: visual API design,... 1 API 71.0 Sift Sift (formerly Sift Science) is the San Francisco-based Digital Trust and Safety platform that protects mor... 6 APIs 69.9 Commerce Layer Commerce Layer is the headless, multi-market commerce API used by global brands to sell everywhere — web, m... 148 APIs 69.5 PropelAuth PropelAuth is a B2B SaaS authentication and multi-tenant user management platform purpose-built for organiz... 18 APIs 68.7 Factorial Factorial is an all-in-one HR, payroll, time, talent, finance, and IT management platform headquartered in ... 22 APIs 68.6 Paystack Paystack is an African payment processor (acquired by Stripe in 2020) that lets businesses accept payments ... 21 APIs 68.5 emnify emnify is a cloud-native global IoT cellular connectivity provider operating its own mobile core and SuperN... 29 APIs 68.3 Truework Truework operates a unified income and employment verification platform for mortgage lenders, credit unions... 5 APIs 68.2 fireblocks Fireblocks is an institutional digital-asset and stablecoin infrastructure company providing MPC-secured cu... 35 APIs 67.2 Mockaroo Mockaroo is a realistic mock data generator and API mocking service used by developers and QA teams to prod... 4 APIs 66.3 Olo Olo is a leading on-demand commerce platform powering the digital experience for restaurant brands, serving... 15 APIs 66.0
Strong 12 Solid coverage with minor gaps
Moniepoint Moniepoint is Africa's all-in-one financial platform for small and medium-sized businesses and individuals ... 19 APIs 64.7 Mews Mews is a cloud-native hospitality operating system serving 15,000+ hotels, hostels, and vacation-rental pr... 78 APIs 64.2 dLocal dLocal (NASDAQ: DLO) is a Uruguay-headquartered emerging-markets payment infrastructure platform connecting... 16 APIs 64.1 Amazon Mechanical Turk Amazon Mechanical Turk (MTurk) is a crowdsourcing marketplace that makes it easier for individuals and busi... 39 APIs 63.7 Intuit Collection of APIs offered by Intuit for financial and business management services. 11 APIs 63.7 Upvest Upvest is a Berlin-based API-first investment infrastructure provider that enables banks, brokers, and weal... 35 APIs 63.2 Deel Deel is a global workforce platform combining payroll, Employer of Record (EOR), independent contractor man... 39 APIs 61.3 StackOne StackOne is an AI-powered embedded integration platform as a service (iPaaS) designed to simplify and accel... 33 APIs 60.4 Uber Uber is a global technology platform offering transportation, food delivery, and logistics services. Its de... 20 APIs 59.8 token-io Token.io is an Open Banking infrastructure provider offering A2A (Account-to-Account) payments and account ... 29 APIs 58.4 Interswitch Interswitch is Nigeria's foundational digital payments and transaction-switching company, founded in 2002 a... 32 APIs 58.0 Apollo Config Apollo is a reliable, open-source configuration management system suitable for microservice configuration m... 5 APIs 57.0
Developing 9 Usable, with meaningful gaps to close
Ambassador Ambassador is a Kubernetes-native API Gateway built on Envoy Proxy, providing routing, load balancing, auth... 11 APIs 54.2 Block Block, Inc. is a global technology company building economic empowerment tools through a family of products... 5 APIs 53.3 Bank of America Bank of America is a multinational investment bank and financial services holding company providing consume... 6 APIs 52.5 BNY Mellon BNY Mellon is a global investments company providing asset servicing, asset management, wealth management, ... 5 APIs 52.4 Dexcom Dexcom is a leading medical device company that develops, manufactures, and distributes continuous glucose ... 7 APIs 48.2 Amazon Cloud Map Amazon Cloud Map is a cloud resource discovery service that maintains an updated registry of application re... 3 APIs 45.7 Agave Agave is a unified API platform for the construction industry, enabling software companies and contractors ... 11 APIs 44.8 Beeceptor Beeceptor is an API mocking, HTTP debugging, and proxy platform that lets developers create mock servers in... 5 APIs 43.7 Pinwheel Pinwheel is an employment and income data platform that connects banks, fintechs, and lenders directly to p... 12 APIs 43.4
Thin 9 Limited public surface area
APIGit APIGit is a Git-native platform for full lifecycle API development that combines version control, API desig... 4 APIs 40.6 OPay OPay is a Nigerian mobile money and fintech super-app operated by Blue Ridge Microfinance Bank (OPay Digita... 3 APIs 39.6 Loadsmart Loadsmart is a digital freight technology company and 4PL that connects shippers, carriers, warehouses, and... 48 APIs 38.7 Automatic Data Processing (ADP) Automatic Data Processing (ADP) is a global provider of cloud-based human capital management (HCM) solution... 6 APIs 36.5 BBVA BBVA is a multinational Spanish financial services group operating in over 30 countries. The BBVA API Marke... 4 APIs 36.3 Ola Ola is India's leading ride-sharing and mobility platform operating across 100+ cities in India and interna... 5 APIs 33.1 NHS England Digital NHS England (incorporating the former NHS Digital and NHSX) provides national digital, data, and technology... 7 APIs 30.9 Apiary Apiary is an API design and documentation platform, now part of Oracle Cloud Infrastructure. With 486,000+ ... 2 APIs 30.6 Paysafe Paysafe is an integrated payment platform providing businesses with REST APIs for online payments, digital ... 9 APIs 30.3
Emerging 4 Early or largely undocumented
API Blueprint API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenti... 1 API 21.5 OpenTable OpenTable is a global restaurant reservation platform owned by Booking Holdings. The OpenTable Partner Port... 2 APIs 21.4 Ecologi Ecologi is a Bristol, UK climate action platform and B Corp founded in 2019 that lets individuals and busin... 2 APIs 20.8 Hostfully Hostfully is a San Francisco-based short-term rental (STR) property management platform serving vacation re... 2 APIs 20.3
Minimal 1 Almost no public developer surface
Unitree Robotics Unitree Robotics is a Hangzhou, China-based high-performance robot manufacturer founded in 2016 by Wang Xin... 12.6

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

100 RPS read/write in live mode, 25 RPS in test mode60-day or unlimited sandbox accessAPI MockingAPI Mocking with BlackbirdClaude Haiku 4.5 — fastest model with near-frontier intelligenceDynamic Mock ServerFactory Test Mode (FTM) — 100 KB data and 10 SMS free per SIM for pre-production validationFree for personal mock APIs (1 endpoint, 50 requests/day). Paid plans from $10/mo.Mock APIsMock Server GenerationMock ServersMulti-Environment SupportMulti-environment: live and test environments with separate rate limitsProduction and Demo environments (api.factorialhr.com vs api.demo.factorialhr.com)Production environment at `https://api.mews.com`, demo environment at `https://api.mews-demo.com` with free test credentialsSandbox EnvironmentSandbox EnvironmentsSandbox environment at `sandbox.interswitchng.com` and `qa.interswitchng.com` with public test credentialsSandbox environment at api-sandbox.demo.deel.com with pre-populated test workersSandbox environment at dashboard.sandbox.token.ioSandbox environment at https://api.truework-sandbox.com with deterministic test SSN fixturesSandbox environment at sandbox.dlocal.com (and marketplace-api.dlocal-sbox.com) with chargeback simulationSandbox environment at sandbox.monnify.com with separate API key / secret pairSandbox environment for partner integration testing prior to production approvalSandbox environment with pre-funded test assets and communal test co-signerSandbox environment with synthetic dataSandbox environments (Developer/Partial/Full)Sandbox environments for both API surfacesSeparate staging environment included on Growth tier and aboveTest ModeTest environment at api.test.paysafe.comTest mode via "test"unitree_mujoco — MuJoCo simulation environment

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