# Getting Started

Welcome to OffBlocks API, a powerful platform that offers comprehensive endpoints and capabilities for user (customer) onboarding, account and card management, transaction lifecycle, and real-time updates via webhooks. This guide provides step-by-step instructions on how to seamlessly integrate your application with OffBlocks API. For your reference and code generation, you can also download the full OpenAPI 3.1 specification for OffBlocks API [here](https://offblocks.github.io/offblocks-api-spec/).

## Environments

OffBlocks API is currently available in a limited Sandbox environment, offering reduced functionality for demonstration purposes. As our API evolves, we will progressively enable more features and functionality through the Production environment.

The current version of the Sandbox API can be accessed via the following URL: `https://api.sandbox.offblocks.xyz/v1`. To set up your access and begin exploring the capabilities, please contact us at <gm@offblocks.xyz>.

## Key Concepts

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[Postman](/developer-guides/api-integration/postman.md)
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[Authentication](/developer-guides/api-integration/authentication.md)
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[Request Signatures](/developer-guides/api-integration/request-signatures.md)
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[Idempotency](/developer-guides/api-integration/idempotency.md)
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[Blockchain Identifiers](/developer-guides/api-integration/blockchain-identifiers.md)
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[Blockchain Updates](/developer-guides/api-integration/blockchain-updates.md)
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[Sign in With X](/developer-guides/api-integration/sign-in-with-x.md)
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[Fees](/developer-guides/api-integration/fees.md)
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[Simulator](/developer-guides/api-integration/simulator.md)
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## API Documentation

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[API Reference](/developer-guides/api-integration/api-reference.md)
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[States and Transitions](/developer-guides/api-integration/states-and-transitions.md)
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[Step-by-step Guide](/developer-guides/step-by-step-guide.md)
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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.offblocks.xyz/developer-guides/api-integration/getting-started.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.