# 5. Creating the APIs

As a Solver integrating with SYMMIO, you’ll need to include **REST APIs**, to allow frontends to display data like available symbols, retrieving open interest and notional caps.

## REST APIs

Detailed documentation about REST API endpoint queries and returned data can be found in the following section. It's recommended that solvers follow the same structure in their endpoints to integrate with frontends easily.

The full list of endpoints that solvers can integrate is here, however not all are essential for an implementation. Essential endpoints are listed below:

### [**GET Contract Symbols: /contract-symbols**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-contract-symbols.md)

### [
**GET Open Interest: /open-interest**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-open-interest.md)

### [
**GET Notional Cap by Symbol: /notional\_cap/{symbol\_id}**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-notional-cap.md)

### [
**GET Price Range by Symbol: /price-range/{symbol}**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-price-range.md)

### [
**GET Locked Parameters for a Symbol: /get\_locked\_params/{symbol}?leverage={leverage}**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-get-locked-params.md)

### [
**GET Funding Information: /get\_funding\_info**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-get-funding-info.md)

### [**GET Error Codes: /error\_codes**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/get-error-codes.md)

### [**POST Position Information: /position\_state/\<offset>/\<size>**](/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis/post-position-state.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.symm.io/liquidity-provider-documentation/building-a-solver-on-symmio/5.-creating-the-apis.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.