Speakeasy
: How to use it, features, and the business problems it solves

How to Use

1. Prepare your OpenAPI spec

   Get your API's OpenAPI (Swagger) specification file ready. Speakeasy treats this spec as the single source of truth, generating SDKs and other artifacts from it.

2. Install the CLI and run quickstart

   Install the Speakeasy CLI (a single binary) and run the quickstart command. An interactive flow lets you specify the languages and package details you want to generate.

3. Choose your target languages

   Select and generate SDKs for the languages you need, including TypeScript, Python, Go, Java, C#, PHP, and Ruby. You can also generate Terraform providers and contract tests here.

4. Customize the output

   Use OpenAPI extensions to rename methods or group operations, preserve hand-written code across regenerations, and otherwise fine-tune what gets generated.

5. Publish automatically with CI/CD

   Integrate with tools like GitHub Actions so that changes to your OpenAPI spec automatically trigger SDK regeneration. Versioning, changelog creation, and publishing to each package manager (npm, PyPI, Maven Central, and so on) are all automated.

Features

• Type-safe SDK generation in multiple languages

  Generate SDKs in TypeScript, Python, Go, Java, C#, PHP, Ruby, and more from an OpenAPI spec. The generated code is idiomatic, type-safe, and built to production-grade quality.

• MCP server generation

  Generate an MCP (Model Context Protocol) server so your API can be used by AI agents. This is ideal for making an existing API ready for AI integration.

• Terraform provider generation

  Generate a Terraform provider from your OpenAPI spec so your API can be managed as code (IaC).

• Contract test generation

  Generate contract tests that verify consistency between the API and its spec, preventing drift between the specification and implementation.

• Authentication, retries, and pagination support

  Practical features are built in by default, including OAuth 2.0, API key, and bearer-token authentication, automatic retries with exponential backoff, pagination helpers, and webhook signature verification.

• CI/CD and automatic publishing

  Detect spec changes to automatically regenerate SDKs and automate version numbering, changelogs, and package publishing.

• OpenAPI toolchain

  A suite of tools for linting, previewing, and customizing your OpenAPI spec, helping improve the quality of the spec itself.

Pricing

Pricing is current as of June 2026. Amounts are in US dollars, and the yen equivalent fluctuates with exchange rates. Billing is counted per language and per operation (the operationId in OpenAPI). Check the official pricing page for the latest details.

*You retain ownership of the generated code. Operations are counted by the number of unique operationIds in the spec, and endpoints you exclude are not billed.

Pros and Cons

Pros

• Generate multi-language SDKs from a single OpenAPI spec, dramatically reducing the effort of writing and maintaining them by hand
• Generate MCP servers, Terraform providers, and contract tests all from the same tool
• Keep up with spec changes and automate everything through publishing via CI/CD
• You retain ownership of the generated code, making vendor lock-in easier to avoid

Cons

• The interface and documentation are primarily in English
• Paid plans bill per language and per operation, so larger projects require careful cost planning
• High-quality generation assumes you have the knowledge to maintain a well-structured OpenAPI spec

Reviews and Reputation

• Developers praise it for being able to "generate SDKs in multiple languages from OpenAPI all at once, dramatically reducing SDK maintenance burden."
• Users say "the generated code is readable, with retries and authentication built in" and "being able to generate a Terraform provider too is convenient."
• On the other hand, some point out that it is "English-centric" and that "billing per language and per operation makes costs hard to see once you exceed the free tier."

Frequently Asked Questions (FAQ)

Q. Can I use Speakeasy for free?

Yes. There is a free plan that lets you use SDK and MCP generation and automatic package publishing for up to 250 operations per language. Scaling up or adding features requires a Business or higher paid plan.

Q. What SDK languages can it generate?

It supports major languages including TypeScript, Python, Go, Java, C#, PHP, and Ruby, and can also generate Terraform providers, contract tests, and MCP servers.

Q. Who owns the generated code?

Ownership of the generated code remains with you.

Q. Does it support Japanese?

The interface and documentation are primarily in English. The generated SDKs themselves are code that follows each language's conventions, and no Japanese UI is provided.

How Speakeasy Differs from Other SDK Generation and Development Tools

For a more detailed comparison, see the pages for related services as well.