> For the complete documentation index, see [llms.txt](https://docs.trustlesswork.com/trustless-work/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trustlesswork.com/trustless-work/v2-en/escrow-react-sdk/architecture.md).

# Architecture

## Architecture

#### Package entry points

| Import                                 | Contains                                            |
| -------------------------------------- | --------------------------------------------------- |
| `@trustless-work/escrow`               | Config, client, REST + GraphQL hooks, types, errors |
| `@trustless-work/escrow/rest`          | `EscrowRestService` + REST hooks only               |
| `@trustless-work/escrow/graphql`       | GraphQL service, documents, GraphQL hooks           |
| `@trustless-work/escrow/hooks`         | All hooks (REST + GraphQL)                          |
| `@trustless-work/escrow/hooks/rest`    | REST hooks only                                     |
| `@trustless-work/escrow/hooks/graphql` | GraphQL hooks only                                  |
| `@trustless-work/escrow/types`         | Payloads, responses, read-model, entities           |

```typescript
import { useEscrowRest, useEscrowGraphql } from "@trustless-work/escrow";
import { useGraphqlGetEscrow } from "@trustless-work/escrow/hooks/graphql";

const rest = useEscrowRest();
const graphql = useEscrowGraphql();
const { getEscrow } = useGraphqlGetEscrow();
```

#### Client layers

```mermaid
flowchart TB
  Config[TrustlessWorkConfig]
  Client[TrustlessWorkClient]
  Transport[HttpTransport]
  Rest[EscrowRestService]
  Gql[EscrowGraphqlService]

  Config --> Client
  Client --> Transport
  Transport --> Rest
  Transport --> Gql
```

* **Operate URLs:** `/escrow/{single-release|multi-release}/v2/...`
* **Submit:** `POST /stellar/send-transaction`
* **REST reads:** `GET /escrows*`
* **GraphQL:** `POST /graphql`

#### Build → sign → send

Every mutate hook returns an **unsigned** transaction. You sign with the wallet, then submit.

```typescript
import {
  useDeployEscrow,
  useSendTransaction,
  toTrustlessWorkError,
  TrustlessWorkApiError,
  formatApiErrorMessage,
} from "@trustless-work/escrow";
import type { DeploySingleReleaseEscrowPayload } from "@trustless-work/escrow/types";

const { deployEscrow } = useDeployEscrow();
const { sendTransaction } = useSendTransaction();

const onSubmit = async (payload: DeploySingleReleaseEscrowPayload) => {
  try {
    const { unsignedXdr, contractId } = await deployEscrow(payload, "single-release");
    const signedXdr = await signWithWallet(unsignedXdr);
    const result = await sendTransaction(signedXdr);

    if (result.code === "STELLAR_TX_SUBMITTED_INDEXER_LAGGING") {
      // Tx is on-chain; poll GET /escrows/:contractId until the indexer catches up
    }
  } catch (error: unknown) {
    const normalized = toTrustlessWorkError(error);
    if (normalized instanceof TrustlessWorkApiError) {
      console.error(formatApiErrorMessage(normalized), normalized.code);
    }
    throw error;
  }
};
```

#### Response shapes

| Step         | Type                       | Shape                                                       |
| ------------ | -------------------------- | ----------------------------------------------------------- |
| Deploy build | `DeployEscrowResponse`     | `{ unsignedXdr, txHash, contractId }`                       |
| Other builds | `BuildTransactionResponse` | `{ unsignedXdr, txHash }`                                   |
| Submit       | `SendTransactionResponse`  | `{ txHash, ledger, contractId?, escrow?, code?, message? }` |

`code` may be `STELLAR_TX_SUBMITTED` or `STELLAR_TX_SUBMITTED_INDEXER_LAGGING`.

{% hint style="info" %}
Deploy trustline shape: `{ contractId, symbol }` (Soroban SAC `C…` + asset code).
{% endhint %}

#### Environment

`development` and `mainNet` currently point at:

`https://trustless-core-production.up.railway.app`

Pass any Core API `baseURL` string when you need another host.


---

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