> For the complete documentation index, see [llms.txt](https://shinkalabs.gitbook.io/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://shinkalabs.gitbook.io/hub/andromeda/sdks-and-tooling/samples.md).

# Code samples

The API is plain HTTPS with JSON bodies and an `X-Api-Key` header, so any HTTP client works. Below are the same call (estimate the cost of an operation) in a few languages. Swap in real endpoints from the [OpenAPI spec](https://api.andromedainfra.pro/openapi.json).

## curl

```bash
curl -X POST https://api.andromedainfra.pro/v1/pricing/estimate \
  -H "X-Api-Key: $ANDROMEDA_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "operations": ["ika.sign.submit"] }'
```

## Node (fetch)

```js
const res = await fetch("https://api.andromedainfra.pro/v1/pricing/estimate", {
  method: "POST",
  headers: {
    "X-Api-Key": process.env.ANDROMEDA_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ operations: ["ika.sign.submit"] }),
});
const data = await res.json();
```

## Go

```go
req, _ := http.NewRequest("POST",
    "https://api.andromedainfra.pro/v1/pricing/estimate",
    strings.NewReader(`{"operations":["ika.sign.submit"]}`))
req.Header.Set("X-Api-Key", os.Getenv("ANDROMEDA_KEY"))
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
```

## Python (requests)

```python
import os, requests

r = requests.post(
    "https://api.andromedainfra.pro/v1/pricing/estimate",
    headers={"X-Api-Key": os.environ["ANDROMEDA_KEY"]},
    json={"operations": ["ika.sign.submit"]},
)
print(r.json())
```

## Rust (reqwest)

```rust
let client = reqwest::Client::new();
let resp = client
    .post("https://api.andromedainfra.pro/v1/pricing/estimate")
    .header("X-Api-Key", std::env::var("ANDROMEDA_KEY")?)
    .json(&serde_json::json!({ "operations": ["ika.sign.submit"] }))
    .send()
    .await?;
```

## For real flows

* Add an `Idempotency-Key` header on mutating calls. See [Idempotency keys](/hub/andromeda/guides/idempotency.md).
* For `prepare -> submit` flows, sign the returned `unsignedTx` with your chain's signing library before calling submit. See [Custody-free model](/hub/andromeda/concepts/custody-free.md).
* For `challenge -> submit` flows, have the user sign the 32-byte challenge with their wallet or passkey, then submit the signature. See [Wallet-agnostic & challenge auth](/hub/andromeda/concepts/wallet-agnostic.md).
* To generate a full typed client instead of hand-writing requests, see [OpenAPI codegen](/hub/andromeda/sdks-and-tooling/codegen.md).


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