# Call
(*call*)
## Overview
### Available Operations
* [call](#call) - Make a Network-Specific Procedure Call
## call
Call invokes an arbitrary, network-specific procedure call with network-specific parameters. The guidance for what this endpoint should or could do is purposely left vague. In Ethereum, this could be used to invoke `eth_call` to implement an entire Rosetta API interface for some smart contract that is not parsed by the implementation creator (like a DEX). This endpoint could also be used to provide access to data that does not map to any Rosetta models instead of requiring an integrator to use some network-specific SDK and call some network-specific endpoint (like surfacing staking parameters). Call is NOT a replacement for implementing Rosetta API endpoints or mapping network-specific data to Rosetta models. Rather, it enables developers to build additional Rosetta API interfaces for things they care about without introducing complexity into a base-level Rosetta implementation. Simply put, imagine that the average integrator will use layered Rosetta API implementations that each surfaces unique data.
### Example Usage
```typescript
import { Icpmcp } from "icpmcp-rosetta-api";
const icpmcp = new Icpmcp({
serverURL: "https://api.example.com",
});
async function run() {
const result = await icpmcp.call.call({
networkIdentifier: {
blockchain: "bitcoin",
network: "mainnet",
subNetworkIdentifier: {
network: "shard 1",
metadata: {},
},
},
method: "eth_call",
parameters: {},
});
console.log(result);
}
run();
```
### Standalone function
The standalone function version of this method:
```typescript
import { IcpmcpCore } from "icpmcp/core.js";
import { callCall } from "icpmcp/funcs/callCall.js";
// Use `IcpmcpCore` for best tree-shaking performance.
// You can create one instance of it to use across an application.
const icpmcp = new IcpmcpCore({
serverURL: "https://api.example.com",
});
async function run() {
const res = await callCall(icpmcp, {
networkIdentifier: {
blockchain: "bitcoin",
network: "mainnet",
subNetworkIdentifier: {
network: "shard 1",
metadata: {},
},
},
method: "eth_call",
parameters: {},
});
if (res.ok) {
const { value: result } = res;
console.log(result);
} else {
console.log("callCall failed:", res.error);
}
}
run();
```
### Parameters
| Parameter | Type | Required | Description |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `request` | [models.CallRequest](../../models/callrequest.md) | :heavy_check_mark: | The request object to use for the request. |
| `options` | RequestOptions | :heavy_minus_sign: | Used to set various options for making HTTP requests. |
| `options.fetchOptions` | [RequestInit](https://developer.mozilla.org/en-US/docs/Web/API/Request/Request#options) | :heavy_minus_sign: | Options that are passed to the underlying HTTP request. This can be used to inject extra headers for examples. All `Request` options, except `method` and `body`, are allowed. |
| `options.retries` | [RetryConfig](../../lib/utils/retryconfig.md) | :heavy_minus_sign: | Enables retrying HTTP requests under certain failure conditions. |
### Response
**Promise\<[models.CallResponse](../../models/callresponse.md)\>**
### Errors
| Error Type | Status Code | Content Type |
| ------------------------- | ------------------------- | ------------------------- |
| errors.ErrorT | 500 | application/json |
| errors.IcpmcpDefaultError | 4XX, 5XX | \*/\* |
