> For the complete documentation index, see [llms.txt](https://docs.cspr.cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cspr.cloud/x402-facilitator-api/settle.md).

# Settle

Validates a client's signed payment payload and, if valid, submits the payment transaction to the Casper Network. The facilitator's account pays the gas (motes) for the settlement deploy; the CEP-18 tokens are transferred from the payer to the payee via the `transfer_with_authorization` contract entry point.

```
POST /settle
```

## Request body

The request body has the same shape as [/verify](/x402-facilitator-api/verify.md).

| Property              | Type     | Required | Description                                               |
| --------------------- | -------- | -------- | --------------------------------------------------------- |
| `paymentPayload`      | `object` | Yes      | The signed payment payload submitted by the client.       |
| `paymentRequirements` | `object` | Yes      | The payment requirements declared by the resource server. |

See [Verify](/x402-facilitator-api/verify.md) for the full schema of `paymentPayload` and `paymentRequirements`.

## Response

The response always returns HTTP `200`. The `success` field indicates whether settlement succeeded.

| Property       | Type      | Description                                                           |
| -------------- | --------- | --------------------------------------------------------------------- |
| `success`      | `boolean` | `true` if the payment was settled on-chain, `false` otherwise.        |
| `transaction`  | `string`  | Casper deploy hash of the settlement transaction (64 hex characters). |
| `network`      | `string`  | CAIP-2 network identifier where the payment was settled.              |
| `payer`        | `string`  | Casper account hash of the payer.                                     |
| `errorReason`  | `string`  | Machine-readable error code, present when `success` is `false`.       |
| `errorMessage` | `string`  | Human-readable error description, present when `success` is `false`.  |

### Error codes

In addition to all [verification error codes](/x402-facilitator-api/verify.md#error-codes), the following codes may appear during settlement:

| Code                  | Description                                                                              |
| --------------------- | ---------------------------------------------------------------------------------------- |
| `network_mismatch`    | The facilitator has no signing key configured for the requested network.                 |
| `verification_failed` | The payload failed pre-settlement verification.                                          |
| `build_deploy_failed` | Failed to build the Casper `TransactionV1`.                                              |
| `sign_deploy_failed`  | Failed to sign the transaction with the facilitator's key.                               |
| `put_deploy_failed`   | Failed to submit the transaction to the Casper Network.                                  |
| `wait_deploy_failed`  | The transaction was submitted but confirmation timed out or returned an execution error. |

## Example

```bash
curl -X 'POST' \
  'https://x402-facilitator.cspr.cloud/settle' \
  -H 'authorization: 55f79117-fc4d-4d60-9956-65423f39a06a' \
  -H 'accept: application/json' \
  -H 'content-type: application/json' \
  -d '{
    "paymentPayload": {
      "x402Version": 2,
      "resource": {
          "url": "http://127.0.0.1:3002/api/data"
      },
      "accepted": {
          "scheme": "exact",
          "network": "casper:casper-test",
          "asset": "9824d60dc3a5c44a20b9fd260a412437933835b52fc683d8ae36e4ec2114843e",
          "amount": "10000",
          "payTo": "0000000000000000000000000000000000000000000000000000000000000000",
          "maxTimeoutSeconds": 300
      },
      "payload": {
        "signature": "01a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f601",
        "publicKey": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04",
        "authorization": {
          "from":        "00048a54220799a48171743407c086668bdcc788e2a31e4185fe52d0682634f888",
          "to":          "009e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7",
          "value":       "10000",
          "validAfter":  "1710000000",
          "validBefore": "1710000900",
          "nonce":       "a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2"
        }
      }
    },
    "paymentRequirements": {
      "scheme": "exact",
      "network": "casper:casper-test",
      "payTo":  "009e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7",
      "amount": "10000",
      "asset":  "9824d60dc3a5c44a20b9fd260a412437933835b52fc683d8ae36e4ec2114843e",
      "maxTimeoutSeconds": 900,
      "extra": {
        "name":     "Cep18x402",
        "version":  "1",
        "decimals": "2",
        "symbol":   "CSPR"
      }
    }
  }'
```

Successful settlement:

```json
{
  "success": true,
  "transaction": "88461218a5e972fcda1d764d7cc4edb2e0c3a538123b97890d484f43c55935f5",
  "network": "casper:casper-test",
  "payer": "00048a54220799a48171743407c086668bdcc788e2a31e4185fe52d0682634f888"
}
```

Failed settlement:

```json
{
  "success": false,
  "errorReason": "invalid_signature",
  "errorMessage": "signature verification failed",
  "transaction": "",
  "network": "casper:casper-test",
  "payer": ""
}
```


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