# Token Indexing & Retrieval

#### **Configuration:**

Ordiswap's indexer is configured with retry and rate-limiting capabilities. This is crucial for handling potential network issues and preventing abuse of the API by limiting the number of requests per second.

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#### **Token Information Retrieval:**

Ordiswap defines functions to retrieve information about tokens from the blockchain indexer.

`getToken`: Retrieves detailed information about a specific token using its ticker.

`getTokenList`: Retrieves a list of all tokens, converting tickers to uppercase for consistency.

`getTokenTickerList`: Retrieves a list of token tickers.

`getBtcBalance`: Retrieves the Bitcoin balance for a given address.<br>

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#### **Token Balance Retrieval:**

Functions to get token balances for a specific token and address.

`getTokenBalance`: Retrieves the balance of a specific token for a given address.

`getTokenBalanceList`: Retrieves a list of token balances for all tokens associated with a specific address.

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&#x20;**Token Information and Indexing:**

`getTokenInfo`: Retrieves detailed information about a token, including ticker, maximum supply, limit, and decimal points.

`brc20_index`: Initiates a continuous process to index new tokens. It queries the blockchain indexer for a list of tokens, checks if each token is already in the collection, fetches detailed information, and inserts new tokens into the collection.

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**Error Handling:**

Ordiswap includes error handling for HTTP requests. If an error occurs, it logs the error and sets an `indexerError` flag. Ordiswap checks for a specific error code (-2005) to identify indexer-related issues.

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#### **Configuration and Global Variables:**

Ordiswap uses configuration variables like `INDEXER_URL`, `INDEXER_API_KEY`, and `FIND_OPTIONS`. These likely represent the endpoint URL for the blockchain indexer, API key for authorization, and find options for DB queries.

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#### System Flow:

**Token Retrieval:**

Users can retrieve detailed information about individual tokens, lists of tokens, and token tickers.

**Balance Retrieval:**

Users can obtain token balances for a specific token or a list of balances for all tokens associated with a given address.

**Token Indexing:**

The continuous process (`brc20_index`) fetches the list of tokens from the blockchain indexer, checks and inserts new tokens into the collection, and maintains an error flag (`indexerError`).

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