Feature

Sandbox Environment

A safe test environment with fake data.

50 providers 418 APIs 30 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.

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

Providers

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

Exemplar 6 Complete, well-documented, and agent-ready
Stripe Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce f... 57 APIs 80.1 Postman Postman is the world's leading API platform, used by 35+ million developers to design, build, test, documen... 17 APIs 75.3 Salesforce Salesforce is a cloud-based customer relationship management (CRM) platform that provides a comprehensive s... 43 APIs 75.3 Anthropic Anthropic is an AI safety company and creator of the Claude family of large language models (Opus, Sonnet, ... 11 APIs 72.6 Paystack Paystack is an African payment processor (acquired by Stripe in 2020) that lets businesses accept payments ... 14 APIs 70.6 Commerce Layer Commerce Layer is the headless, multi-market commerce API used by global brands to sell everywhere — web, m... 3 APIs 70.3
Strong 16 Solid coverage with minor gaps
Avalara Avalara helps businesses of all sizes get tax compliance right. We deliver cloud-based solutions that work ... 20 APIs 69.8 Sift Sift (formerly Sift Science) is the San Francisco-based Digital Trust and Safety platform that protects mor... 6 APIs 69.2 Apidog Apidog is an all-in-one API development platform that connects the entire API lifecycle: visual API design,... 1 API 69.1 Merge Merge is the connective infrastructure for production AI. The Merge Unified API offers one API surface acro... 11 APIs 69.0 Olo Olo is a leading on-demand commerce platform powering the digital experience for restaurant brands, serving... 12 APIs 68.3 Moniepoint Moniepoint is Africa's all-in-one financial platform for small and medium-sized businesses and individuals ... 14 APIs 67.8 PropelAuth PropelAuth is a B2B SaaS authentication and multi-tenant user management platform purpose-built for organiz... 5 APIs 67.7 dLocal dLocal (NASDAQ: DLO) is a Uruguay-headquartered emerging-markets payment infrastructure platform connecting... 9 APIs 66.4 Amazon Mechanical Turk Amazon Mechanical Turk (MTurk) is a crowdsourcing marketplace that makes it easier for individuals and busi... 1 API 65.7 Block Block, Inc. is a global technology company building economic empowerment tools through a family of products... 1 API 65.6 fireblocks Fireblocks is an institutional digital-asset and stablecoin infrastructure company providing MPC-secured cu... 15 APIs 63.9 emnify emnify is a cloud-native global IoT cellular connectivity provider operating its own mobile core and SuperN... 4 APIs 63.2 Mockaroo Mockaroo is a realistic mock data generator and API mocking service used by developers and QA teams to prod... 1 API 63.1 Truework Truework operates a unified income and employment verification platform for mortgage lenders, credit unions... 5 APIs 62.5 Mews Mews is a cloud-native hospitality operating system serving 15,000+ hotels, hostels, and vacation-rental pr... 6 APIs 61.6 Interswitch Interswitch is Nigeria's foundational digital payments and transaction-switching company, founded in 2002 a... 12 APIs 60.4
Developing 14 Usable, with meaningful gaps to close
StackOne StackOne is an AI-powered embedded integration platform as a service (iPaaS) designed to simplify and accel... 12 APIs 59.4 Amazon Cloud Map Amazon Cloud Map is a cloud resource discovery service that maintains an updated registry of application re... 1 API 58.4 Uber Uber is a global technology platform offering transportation, food delivery, and logistics services. Its de... 7 APIs 57.0 APIGit APIGit is a Git-native platform for full lifecycle API development that combines version control, API desig... 1 API 56.0 Upvest Upvest is a Berlin-based API-first investment infrastructure provider that enables banks, brokers, and weal... 1 API 56.0 Agave Agave is a unified API platform for the construction industry, enabling software companies and contractors ... 3 APIs 55.9 Intuit Collection of APIs offered by Intuit for financial and business management services. 8 APIs 55.9 token-io Token.io is an Open Banking infrastructure provider offering A2A (Account-to-Account) payments and account ... 12 APIs 55.2 Dexcom Dexcom is a leading medical device company that develops, manufactures, and distributes continuous glucose ... 1 API 54.5 Apollo Config Apollo is a reliable, open-source configuration management system suitable for microservice configuration m... 1 API 54.2 Plaid Plaid is a financial technology company that provides an API platform for businesses to connect with user's... 39 APIs 52.6 BNY Mellon BNY Mellon is a global investments company providing asset servicing, asset management, wealth management, ... 1 API 51.4 Ambassador Ambassador is a Kubernetes-native API Gateway built on Envoy Proxy, providing routing, load balancing, auth... 6 APIs 51.1 Bank of America Bank of America is a multinational investment bank and financial services holding company providing consume... 1 API 50.1
Thin 9 Limited public surface area
BBVA BBVA is a multinational Spanish financial services group operating in over 30 countries. The BBVA API Marke... 4 APIs 42.5 OPay OPay is a Nigerian mobile money and fintech super-app operated by Blue Ridge Microfinance Bank (OPay Digita... 1 API 39.1 Beeceptor Beeceptor is an API mocking, HTTP debugging, and proxy platform that lets developers create mock servers in... 1 API 37.3 Loadsmart Loadsmart is a digital freight technology company and 4PL that connects shippers, carriers, warehouses, and... 2 APIs 36.6 Ola Ola is India's leading ride-sharing and mobility platform operating across 100+ cities in India and interna... 5 APIs 36.4 NHS England Digital NHS England (incorporating the former NHS Digital and NHSX) provides national digital, data, and technology... 7 APIs 34.2 Pinwheel Pinwheel is an employment and income data platform that connects banks, fintechs, and lenders directly to p... 12 APIs 34.0 Paysafe Paysafe is an integrated payment platform providing businesses with REST APIs for online payments, digital ... 9 APIs 33.8 Apiary Apiary is an API design and documentation platform, now part of Oracle Cloud Infrastructure. With 486,000+ ... 2 APIs 32.7
Emerging 5 Early or largely undocumented
Automatic Data Processing (ADP) Automatic Data Processing (ADP) is a global provider of cloud-based human capital management (HCM) solution... 6 APIs 27.8 API Blueprint API Blueprint is a high-level API description language using Markdown-based syntax for designing, documenti... 1 API 23.3 Ecologi Ecologi is a Bristol, UK climate action platform and B Corp founded in 2019 that lets individuals and busin... 2 APIs 23.2 OpenTable OpenTable is a global restaurant reservation platform owned by Booking Holdings. The OpenTable Partner Port... 2 APIs 23.2 Hostfully Hostfully is a San Francisco-based short-term rental (STR) property management platform serving vacation re... 2 APIs 22.4

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 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 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"

Scroll for all 30