> For the complete documentation index, see [llms.txt](https://docs.carv.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.carv.io/carv-ecosystem/verifier-nodes/join-mainnet-verifier-nodes/operating-a-verifier-node/running-in-cli/gasless-server-api.md). # Gasless Server API To minimize node operating costs, CARV offers official endpoints that assist node operators in batching operations and posting them on-chain. While gasless transactions still necessitate user signatures for specific operations, CARV ensures endpoint availability. However, if you are concerned about risks, you also have the option to independently send transactions to the smart contract. **Base URLs: ** ### Message Construction To make sure the gasless server still guarantee the authorization from the original node operater, it adopts the [EIP-712](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md) standard to proof authorization through the signature. For more details of message structure: Example config: [Using Docker](/carv-ecosystem/verifier-nodes/join-mainnet-verifier-nodes/operating-a-verifier-node/running-in-cli/using-docker.md#example-config) ### POST ExplorerSendTxNodeEnter `POST /explorer/send_tx_node_enter` #### Message structure (Golang) ```json typedData := apitypes.TypedData{ Types: apitypes.Types{ "EIP712Domain": { { Name: "name", Type: "string", }, { Name: "version", Type: "string", }, { Name: "chainId", Type: "uint256", }, }, "NodeEnterData": { { Name: "replacedNode", Type: "address", }, { Name: "expiredAt", Type: "uint256", }, }, }, PrimaryType: "NodeEnterData", Domain: apitypes.TypedDataDomain{ Name: c.cf.Signature.DomainName, Version: c.cf.Signature.DomainVersion, ChainId: (*math.HexOrDecimal256)(big.NewInt(c.cf.Chain.ChainId)), }, Message: apitypes.TypedDataMessage{ "replacedNode": replacedNode.String(), "expiredAt": expiredAt, }, } ``` #### Body Parameters ```json { "signer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "replaced_node": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "expired_at": 1000000000, "v": 27, "r": "ac0b5874f37c40838a33663da72cf90629a0164f98d7785736cc3fd96abeec67", "s": "10ba15d823cd831ef4061d474cc42d66933c6e45c2865b6d9c5f3646a2599b55", "version": "1.0.0" } ``` #### Params
NameLocationTypeRequiredDescription
Originheaderstringyes
User-Agentheaderstringyes
x-app-idheaderstringyes
» signerbodystringyes
» replaced_nodebodystringyesThe node to replace. There are 2000 active node limit. To join the active set you have to specify a node has lower delegation than you to replace with.
» expired_atbodyintegeryes
» vbodyintegeryes
» rbodystringyes
» sbodystringyes
#### Response Examples 200 Response ```json { "code": 0, "msg": "string", "data": {} } ``` #### Responses | HTTP Status Code | Meaning | Description | Data schema | | ---------------- | ---------------------------------------------------------------- | --------------- | ----------- | | 200 | [OK](https://tools.ietf.org/html/rfc7231#section-6.3.1) | Success | Inline | | 400 | [Bad Request](https://tools.ietf.org/html/rfc7231#section-6.5.1) | ResponseForFail | Inline | #### Responses Data Schema HTTP Status Code **200** | Name | Type | Required | | ------ | ------- | -------- | | » code | integer | true | | » msg | string | true | | » data | object | true | HTTP Status Code **400** | Name | Type | Required | | ------- | ------ | -------- | | » error | string | true | ### POST ExplorerSendTxNodeExit `POST /explorer/send_tx_node_exit` #### Message structure (Golang) ```json apitypes.TypedData{ Types: apitypes.Types{ "EIP712Domain": { { Name: "name", Type: "string", }, { Name: "version", Type: "string", }, { Name: "chainId", Type: "uint256", }, }, "NodeExitData": { { Name: "expiredAt", Type: "uint256", }, }, }, PrimaryType: "NodeExitData", Domain: apitypes.TypedDataDomain{ Name: c.cf.Signature.DomainName, Version: c.cf.Signature.DomainVersion, ChainId: (*math.HexOrDecimal256)(big.NewInt(c.cf.Chain.ChainId)), }, Message: apitypes.TypedDataMessage{ "expiredAt": expiredAt, }, } v, r, s, err := tools.SignTypedDataAndSplit(typedData, c.verifierPrivKey) if err != nil { return } } ``` #### Body Parameters ```json { "signer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "expired_at": 1000000000, "v": 27, "r": "ac0b5874f37c40838a33663da72cf90629a0164f98d7785736cc3fd96abeec67", "s": "10ba15d823cd831ef4061d474cc42d66933c6e45c2865b6d9c5f3646a2599b55", "version": "1.0.0" } ``` #### Params | Name | Location | Type | Required | | ------------- | -------- | ------- | -------- | | Origin | header | string | yes | | User-Agent | header | string | yes | | x-app-id | header | string | yes | | » signer | body | string | yes | | » expired\_at | body | integer | yes | | » v | body | integer | yes | | » r | body | string | yes | | » s | body | string | yes | | » version | body | string | yes | #### Response Examples 200 Response ```json { "code": 0, "msg": "string", "data": {} } ``` #### Responses | HTTP Status Code | Meaning | Description | Data schema | | ---------------- | ---------------------------------------------------------------- | --------------- | ----------- | | 200 | [OK](https://tools.ietf.org/html/rfc7231#section-6.3.1) | Success | Inline | | 400 | [Bad Request](https://tools.ietf.org/html/rfc7231#section-6.5.1) | ResponseForFail | Inline | #### Responses Data Schema HTTP Status Code **200** | Name | Type | Required | | ------ | ------- | -------- | | » code | integer | true | | » msg | string | true | | » data | object | true | HTTP Status Code **400** | Name | Type | Required | | ------- | ------ | -------- | | » error | string | true | ### POST ExplorerSendTxModifyCommissionRate `POST /explorer/send_tx_modify_commission_rate` #### Message structure (Golang) ```json typedData := apitypes.TypedData{ Types: apitypes.Types{ "EIP712Domain": { { Name: "name", Type: "string", }, { Name: "version", Type: "string", }, { Name: "chainId", Type: "uint256", }, }, "NodeModifyCommissionRateData": { { Name: "commissionRate", Type: "uint32", }, { Name: "expiredAt", Type: "uint256", }, }, }, PrimaryType: "NodeModifyCommissionRateData", Domain: apitypes.TypedDataDomain{ Name: c.cf.Signature.DomainName, Version: c.cf.Signature.DomainVersion, ChainId: (*math.HexOrDecimal256)(big.NewInt(c.cf.Chain.ChainId)), }, Message: apitypes.TypedDataMessage{ "commissionRate": strconv.Itoa(int(commissionRate)), "expiredAt": expiredAt, }, } ``` #### Body Parameters ```json { "signer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "commission_rate": 100, "expired_at": 1000000000, "v": 27, "r": "ac0b5874f37c40838a33663da72cf90629a0164f98d7785736cc3fd96abeec67", "s": "10ba15d823cd831ef4061d474cc42d66933c6e45c2865b6d9c5f3646a2599b55", "version": "1.0.0" } ``` #### Params | Name | Location | Type | Required | | ------------------ | -------- | ------- | -------- | | Origin | header | string | yes | | User-Agent | header | string | yes | | x-app-id | header | string | yes | | » signer | body | string | yes | | » commission\_rate | body | integer | yes | | » expired\_at | body | integer | yes | | » v | body | integer | yes | | » r | body | string | yes | | » s | body | string | yes | #### Response Examples 200 Response ```json { "code": 0, "msg": "string", "data": {} } ``` #### Responses | HTTP Status Code | Meaning | Description | Data schema | | ---------------- | ---------------------------------------------------------------- | --------------- | ----------- | | 200 | [OK](https://tools.ietf.org/html/rfc7231#section-6.3.1) | Success | Inline | | 400 | [Bad Request](https://tools.ietf.org/html/rfc7231#section-6.5.1) | ResponseForFail | Inline | #### Responses Data Schema HTTP Status Code **200** | Name | Type | Required | | ------ | ------- | -------- | | » code | integer | true | | » msg | string | true | | » data | object | true | HTTP Status Code **400** | Name | Type | Required | | ------- | ------ | -------- | | » error | string | true | ### POST ExplorerSendTxSetRewardClaimer `POST /explorer/send_tx_set_reward_claimer` #### Message structure (Golang) ```json typedData := apitypes.TypedData{ Types: apitypes.Types{ "EIP712Domain": { { Name: "name", Type: "string", }, { Name: "version", Type: "string", }, { Name: "chainId", Type: "uint256", }, }, "NodeSetRewardClaimerData": { { Name: "claimer", Type: "address", }, { Name: "expiredAt", Type: "uint256", }, }, }, PrimaryType: "NodeSetRewardClaimerData", Domain: apitypes.TypedDataDomain{ Name: c.cf.Signature.DomainName, Version: c.cf.Signature.DomainVersion, ChainId: (*math.HexOrDecimal256)(big.NewInt(c.cf.Chain.ChainId)), }, Message: apitypes.TypedDataMessage{ "claimer": rewardClaimer.String(), "expiredAt": expiredAt, }, } ``` #### Body Parameters ```json { "signer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "claimer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "expired_at": 1000000000, "v": 27, "r": "ac0b5874f37c40838a33663da72cf90629a0164f98d7785736cc3fd96abeec67", "s": "10ba15d823cd831ef4061d474cc42d66933c6e45c2865b6d9c5f3646a2599b55", "version": "1.0.0" } ``` #### Params | Name | Location | Type | Required | | ------------- | -------- | ------- | -------- | | Origin | header | string | yes | | User-Agent | header | string | yes | | x-app-id | header | string | yes | | body | body | object | no | | » signer | body | string | yes | | » claimer | body | string | yes | | » expired\_at | body | integer | yes | | » v | body | integer | yes | | » r | body | string | yes | | » s | body | string | yes | #### Response Examples 200 Response ```json { "code": 0, "msg": "string", "data": {} } ``` #### Responses | HTTP Status Code | Meaning | Description | Data schema | | ---------------- | ---------------------------------------------------------------- | --------------- | ----------- | | 200 | [OK](https://tools.ietf.org/html/rfc7231#section-6.3.1) | Success | Inline | | 400 | [Bad Request](https://tools.ietf.org/html/rfc7231#section-6.5.1) | ResponseForFail | Inline | #### Responses Data Schema HTTP Status Code **200** | Name | Type | Required | | ------ | ------- | -------- | | » code | integer | true | | » msg | string | true | | » data | object | true | HTTP Status Code **400** | Name | Type | Required | | ------- | ------ | -------- | | » error | string | true | ### POST ExplorerSendTxNodeReportVerification `POST /explorer/send_tx_node_report_verification` #### Message structure (Golang) ```json typedData := apitypes.TypedData{ Types: apitypes.Types{ "EIP712Domain": { { Name: "name", Type: "string", }, { Name: "version", Type: "string", }, { Name: "chainId", Type: "uint256", }, }, "VerificationData": { { Name: "attestationID", Type: "bytes32", }, { Name: "result", Type: "uint8", }, { Name: "index", Type: "uint32", }, }, }, PrimaryType: "VerificationData", Domain: apitypes.TypedDataDomain{ Name: c.cf.Signature.DomainName, Version: c.cf.Signature.DomainVersion, ChainId: (*math.HexOrDecimal256)(big.NewInt(c.cf.Chain.ChainId)), }, Message: apitypes.TypedDataMessage{ "attestationID": attestationId[:], "result": strconv.Itoa(int(result)), "index": strconv.Itoa(int(index)), }, } ``` #### Body Parameters ```json { "signer": "0xb1878c4d1BAAbbB6abba3d77836cC85A80D5753B", "attestation_id": "0x518c1c43067238438f81546f39623c49b09a8eeeb0ee14794aafefd9fa84c7ab", "result": 0, "index": 1, "v": 27, "r": "ac0b5874f37c40838a33663da72cf90629a0164f98d7785736cc3fd96abeec67", "s": "10ba15d823cd831ef4061d474cc42d66933c6e45c2865b6d9c5f3646a2599b55", "version": "1.0.0" } ``` #### Params | Name | Location | Type | Required | | ----------------- | -------- | ------- | -------- | | Origin | header | string | yes | | User-Agent | header | string | yes | | x-app-id | header | string | yes | | » signer | body | string | yes | | » attestation\_id | body | string | yes | | » result | body | integer | yes | | » index | body | integer | yes | | » v | body | integer | yes | | » r | body | string | yes | | » s | body | string | yes | #### Response Examples 200 Response ```json { "code": 0, "msg": "string", "data": null } ``` #### Responses | HTTP Status Code | Meaning | Description | Data schema | | ---------------- | ---------------------------------------------------------------- | --------------- | ----------- | | 200 | [OK](https://tools.ietf.org/html/rfc7231#section-6.3.1) | Success | Inline | | 400 | [Bad Request](https://tools.ietf.org/html/rfc7231#section-6.5.1) | ResponseForFail | Inline | #### Responses Data Schema HTTP Status Code **200**
NameTypeRequiredRestrictions
» codeintegertruenone
» msgstringtruenone
» datanulltruenone
HTTP Status Code **400** | Name | Type | Required | | ------- | ------ | -------- | | » error | string | true |