api0.app vs APILayer Marketplace

api0.app combines a no-code API builder with a marketplace for publishing and finding APIs. Its visual builder turns tables or defined fields into typed REST endpoints with request validation and pagination. Supported sources include Postgres, MySQL, SQLite, MongoDB, Google Sheets, CSV uploads and existing REST APIs. Each endpoint has an interactive reference and a downloadable OpenAPI 3.1 specification that updates when the schema changes. Generated APIs are private by default, and marketplace publication is optional. Access features include scoped API keys, secret rotation and rate limits that vary by plan. Publishers can charge per request, offer monthly plans or provide a free tier; the platform meters requests, bills buyers and pays builders monthly after a marketplace fee. The dashboard reports request volume, error rate, p95 latency and revenue by endpoint, including customer-level details. The Free plan costs nothing and includes up to 2 live endpoints and 10,000 requests per month.

APILayer Marketplace is a public web and API platform for discovering, integrating and managing APIs across categories such as machine learning and financial data. APILayer describes a catalog of more than 40 production-grade APIs with one API key, a shared dashboard and consistent documentation. The browser-based Live Demo lets users change parameters, try requests and view sample code in several programming languages. The platform combines subscription billing, usage tracking and support, and responses include a header showing remaining limits. Users must subscribe to an API before using it; almost all APIs have a free plan. Subscriptions can be upgraded, downgraded or canceled without a long-term commitment. Plans include Free Plan at free, billed monthly, with 100 requests monthly; Starter Plan at $19.99 a month; and Pro Plan at $149.99 a month. APILayer targets individual developers and enterprise teams in fintech, e-commerce and SaaS.