# Query and submit transactions

Use the REST API with your existing Cardano transaction library.

Canonical URL: https://getyano.dev/develop/transactions/

Yano supplies chain queries, transaction submission, and script evaluation. Your application or Cardano library owns address generation, keys, transaction construction, and signing.

For provider setup with CCL, MeshJS, or Evolution SDK, start with [Build with any SDK](/develop/blockfrost/).

## Query spendable outputs

Replace `<address>` with a real address on your selected network:

```bash
curl -fsS 'http://localhost:7070/api/v1/addresses/<address>/utxos'
curl -fsS http://localhost:7070/api/v1/epochs/latest/parameters
```

Preserve lovelace and native-asset quantities without floating-point rounding. Build and sign using the returned UTxOs and protocol parameters.

## Submit signed CBOR

```bash
curl -fsS -X POST http://localhost:7070/api/v1/tx/submit \
  -H 'Content-Type: application/cbor' \
  --data-binary @tx.cbor
```

Hex-encoded CBOR is also accepted with `Content-Type: text/plain`. A submission response does not prove inclusion. Query or await confirmation and handle rollback in your application.

## Evaluation

The evaluation route is `/api/v1/utils/txs/evaluate`. Use the running node's [OpenAPI document](/reference/http-api/) for its accepted request/response shapes. The launcher selects Aiken for the JVM and Scalus for native execution; `yano.block-producer.script-evaluator` can override the choice where supported. Aiken's JNA evaluator is not supported by native image.

## Integration choices

- Java: use Cardano Client Lib; [the CCL testkit adapter](/develop/ccl/) provides an in-process backend for tests.
- JavaScript and TypeScript: use the [JavaScript testkit](/develop/javascript-testkit/) alongside your transaction library.
- Indexers: consume N2N blocks on the configured server port and handle rollbacks.

Some REST shapes are Blockfrost-compatible. This does not mean every Blockfrost API is implemented. Inspect the endpoints and schemas of the artifact you run.