Through this endpoint customers can create callback subscriptions for a specific event. In this case the event is when there are new incoming or outgoing confirmed transactions for coins from/to the customer's address with also a response at each confirmation the transaction has received until the specified confirmations limit is reached. By creating this subscription the user will be notified by Crypto APIs 2.0 when that event occurs. The information is returned per specified address.

Being confirmed means that the transactions are verified by miners and added to the next block. This endpoint refers to coins transactions only, not tokens.

For UTXO-based protocols like Bitcoin, a transaction could have multiple inputs and outputs, which means the address could be both sender and recipient. Here is how we inform you on that.

To have an operational callback subscription, you need to first verify a domain for the Callback URL. Please see more information on Callbacks here.

Crypto APIs will notify the user only when the event occurs. There are cases when the specific event doesn't happen at all, or takes a long time to do so. A callback notification will not be sent if the event does not or cannot occur, or will take long time to occur.

Path Parameters

blockchain string Required

Represents the specific blockchain protocol name, e.g. Ethereum, Bitcoin, etc.

network string Required

Represents the name of the blockchain network used; blockchain networks are usually identical as technology and software, but they differ in data, e.g. - "mainnet" is the live network with actual data while networks like "testnet", "sepolia" are test networks.

Query Parameters

context string Optional

In batch situations the user can use the context to correlate responses with requests. This property is present regardless of whether the response was successful or returned as an error. context is specified by the user.

Request Body Schema application/json

context string Optional

data object Required

item object Required

address string Required

Represents the address of the transaction, per which the result is returned.

allowDuplicates boolean Optional

Specifies a flag that permits or denies the creation of duplicate addresses.

Default : false

callbackSecretKey string Optional

Represents the Secret Key value provided by the customer. This field is used for security purposes during the callback notification, in order to prove the sender of the callback as Crypto APIs. For more information please see our Documentation.

callbackUrl string Required

Represents the URL that is set by the customer where the callback will be received at. The callback notification will be received only if and when the event occurs. We support ONLY httpS type of protocol.

confirmationsCount integer Required

Represents the number of confirmations, i.e. the amount of blocks that have been built on top of this block.

Response Schema

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

data object Required

item object Required

address string Required

Represents the address of the transaction, per which the result is returned.

15XyNC88pujwuuur8DCsXBCfEhJJMzHayU

callbackSecretKey string Required

yourSecretKey

callbackUrl string Required

https://example.com

confirmationsCount integer Required

Represents the number of confirmations, i.e. the amount of blocks that have been built on top of this block.

createdTimestamp integer Required

Defines the specific time/date when the subscription was created in Unix Timestamp.

1611238648

eventType string Required

Defines the type of the specific event available for the customer to subscribe to for callback notification.

ADDRESS_COINS_TRANSACTION_CONFIRMED_EACH_CONFIRMATION

isActive boolean Required

Defines whether the subscription is active or not. Set as boolean.

true

referenceId string Required

Represents a unique ID used to reference the specific callback subscription.

bc243c86-0902-4386-b30d-e6b30fa1f2aa

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

code string Required

Specifies an error code, e.g. error 404.

uri_not_found

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The specified URI has not been found. Check the URI and try again.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

limit_greater_than_allowed

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

You have reached the allowed limit. The maximum number of items for this endpoint is {limit}, please use the specific pagination attributes to get the items in portions.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

invalid_pagination

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The pagination attributes that have been used are invalid. Please check the Documentation to see details on pagination.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

code string Required

Specifies an error code, e.g. error 404.

missing_api_key

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The specific authorization header (API Key) is missing, please check our Authorization section in our Documentation.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

invalid_api_key

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The provided API key is invalid. Please, generate a new one from your Dashboard.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

insufficient_credits

code string Required

Specifies an error code, e.g. error 404.

insufficient_credits

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

You have insufficient credits. Please upgrade your plan from your Dashboard or contact our team via email.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

code string Required

Specifies an error code, e.g. error 404.

banned_ip_address

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

This IP address has been banned. To check the reason for that, please contact our team via email.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

endpoint_not_allowed_for_plan

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

This endpoint is not available for your current subscription plan, please upgrade your plan to be able to use it.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

endpoint_not_allowed_for_api_key

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

This endpoint is not available for your API key.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

feature_mainnets_not_allowed_for_plan

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

Mainnets access is not available for your current subscription plan, please upgrade your plan to be able to use it.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

blockchain_events_callbacks_limit_reached

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

You have reached the maximum number of active Blockchain Events subscriptions which is {callbacks_limit} now. Please upgrade your plan to be get higher number of active subscriptions.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

code string Required

Specifies an error code, e.g. error 404.

invalid_data

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The data provided seems to be invalid.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

code string Required

Specifies an error code, e.g. error 404.

already_exists

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The specified resource already exists.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

unsupported_media_type

code string Required

Specifies an error code, e.g. error 404.

unsupported_media_type

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The selected Media Type is unavailable. The Content-Type header should be 'application/json'.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

invalid_request_body_structure

code string Required

Specifies an error code, e.g. error 404.

invalid_request_body_structure

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

Your request body for POST requests must have a structure of { data: { item: [...properties] } }

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

request_limit_reached

code string Required

Specifies an error code, e.g. error 404.

request_limit_reached

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

The request limit has been reached. There can be maximum {requests} requests per {seconds} second(s) made. Please contact our team via email if you need more or upgrade your plan.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2023-04-25

requestId string Required

Defines the ID of the request. The requestId is generated by Crypto APIs and it's unique for every request.

601c1710034ed6d407996b30

context string Optional

yourExampleString

error object Required

unexpected_server_error

code string Required

Specifies an error code, e.g. error 404.

unexpected_server_error

message string Required

Specifies the message of the error, i.e. why the error was returned, e.g. error 404 stands for “not found”.

An unexpected server error has occurred, we are working to fix this. Please try again later and in case it occurs again please report it to our team via email.

details array Items (object) Optional

attribute string Required

Specifies an attribute of the error by name.

attribute which content caused the error

message string Required

Specifies the details of an attribute as part from the error.

message describing the error

Callback parameters

apiVersion string Required

Specifies the version of the API that incorporates this endpoint.

2021-03-20

referenceId string Required

Represents a unique identifier that serves as reference to the specific request which prompts a callback, e.g. Blockchain Events Subscription, Blockchain Automation, etc.

6038d09050653d1f0e40584c

idempotencyKey string Required

Specifies a unique ID generated by the system and attached to each callback. It is used by the server to recognize consecutive requests with the same data with the purpose not to perform the same operation twice.

e55bf7a4a7188855f1c27541a6c387d04cc3b22ee34d1304b0e6ecad61c9906c

data object Required

Specifies all data, as attributes, included into the callback notification, which depends on the event.

product string Required

Represents the Crypto APIs 2.0 product which sends the callback.

BLOCKCHAIN_EVENTS

event string Required

Defines the specific event, for which a callback subscription is set.

ADDRESS_COINS_TRANSACTION_CONFIRMED_EACH_CONFIRMATION

item object Required

Defines an item as one result.

blockchain string Required

Represents the specific blockchain protocol name, e.g. Ethereum, Bitcoin, etc.

bitcoin

network string Required

testnet

address string Required

Defines the specific address to which the transaction has been sent.

15282N4BYEwYh3j1dTgJu64Ey5qWn9Po9F

minedInBlock object Required

Refers to the specific block the transaction was mined in.

height integer Required

Defines the number of blocks in the blockchain preceding this specific block.

667754

hash string Required

Represents the hash of the block's header, i.e. an output that has a fixed length.

dfe45f6724b550c281107ffaa5880cb280878fb4dbaa742aa21449f3d2340c13

timestamp integer Required

Defines the exact date/time when this transaction was mined in seconds since Unix Epoch time.

1610365314

transactionId string Required

Defines the unique ID of the specific transaction, i.e. its identification number.

cbd3dea703bd2bc78bca69ee61ca14e6ffcdd809d07ebbc3b8fea3c30ea38f33

currentConfirmations integer Required

Defines the number of currently received confirmations for the transaction.

targetConfirmations integer Required

Defines the number of confirmation transactions requested as callbacks, i.e. the system can notify till the n-th confirmation.

amount string Required

Defines the amount of coins sent with the confirmed transaction.

0.0611

unit string Required

Defines the unit of the transaction, e.g. BTC.

BTC

direction string Required

Defines whether the transaction is "incoming" or "outgoing".

incoming

Credits Cost : 400 Credits for 1 Results

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               {
    "context": "yourExampleString",
    "data": {
        "item": {
            "address": "mho4jHBcrNCncKt38trJahXakuaBnS7LK5",
            "allowDuplicates": false,
            "callbackSecretKey": "yourSecretKey",
            "callbackUrl": "https://example.com",
            "confirmationsCount": 3
        }
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "address": "15XyNC88pujwuuur8DCsXBCfEhJJMzHayU",
            "callbackSecretKey": "yourSecretKey",
            "callbackUrl": "https://example.com",
            "confirmationsCount": 3,
            "createdTimestamp": 1611238648,
            "eventType": "ADDRESS_COINS_TRANSACTION_CONFIRMED_EACH_CONFIRMATION",
            "isActive": true,
            "referenceId": "bc243c86-0902-4386-b30d-e6b30fa1f2aa"
        }
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "uri_not_found",
        "message": "The specified URI has not been found. Check the URI and try again.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "limit_greater_than_allowed",
        "message": "You have reached the allowed limit. The maximum number of items for this endpoint is {limit}, please use the specific pagination attributes to get the items in portions.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "invalid_pagination",
        "message": "The pagination attributes that have been used are invalid. Please check the Documentation to see details on pagination.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "missing_api_key",
        "message": "The specific authorization header (API Key) is missing, please check our Authorization section in our Documentation.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "invalid_api_key",
        "message": "The provided API key is invalid. Please, generate a new one from your Dashboard.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "insufficient_credits",
        "message": "You have insufficient credits. Please upgrade your plan from your Dashboard or contact our team via email.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "banned_ip_address",
        "message": "This IP address has been banned. To check the reason for that, please contact our team via email.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "endpoint_not_allowed_for_plan",
        "message": "This endpoint is not available for your current subscription plan, please upgrade your plan to be able to use it.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "endpoint_not_allowed_for_api_key",
        "message": "This endpoint is not available for your API key.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "feature_mainnets_not_allowed_for_plan",
        "message": "Mainnets access is not available for your current subscription plan, please upgrade your plan to be able to use it.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "blockchain_events_callbacks_limit_reached",
        "message": "You have reached the maximum number of active Blockchain Events subscriptions which is {callbacks_limit} now. Please upgrade your plan to be get higher number of active subscriptions.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "invalid_data",
        "message": "The data provided seems to be invalid.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "already_exists",
        "message": "The specified resource already exists.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "unsupported_media_type",
        "message": "The selected Media Type is unavailable. The Content-Type header should be 'application/json'.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "invalid_request_body_structure",
        "message": "Your request body for POST requests must have a structure of { data: { item: [...properties] } }",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "request_limit_reached",
        "message": "The request limit has been reached. There can be maximum {requests} requests per {seconds} second(s) made. Please contact our team via email if you need more or upgrade your plan.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2023-04-25",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "error": {
        "code": "unexpected_server_error",
        "message": "An unexpected server error has occurred, we are working to fix this. Please try again later and in case it occurs again please report it to our team via email.",
        "details": [
            {
                "attribute": "attribute which content caused the error",
                "message": "message describing the error"
            }
        ]
    }
}

{
    "apiVersion": "2021-03-20",
    "referenceId": "6038d09050653d1f0e40584c",
    "idempotencyKey": "e55bf7a4a7188855f1c27541a6c387d04cc3b22ee34d1304b0e6ecad61c9906c",
    "data": {
        "product": "BLOCKCHAIN_EVENTS",
        "event": "ADDRESS_COINS_TRANSACTION_CONFIRMED_EACH_CONFIRMATION",
        "item": {
            "blockchain": "bitcoin",
            "network": "testnet",
            "address": "15282N4BYEwYh3j1dTgJu64Ey5qWn9Po9F",
            "minedInBlock": {
                "height": 667754,
                "hash": "dfe45f6724b550c281107ffaa5880cb280878fb4dbaa742aa21449f3d2340c13",
                "timestamp": 1610365314
            },
            "transactionId": "cbd3dea703bd2bc78bca69ee61ca14e6ffcdd809d07ebbc3b8fea3c30ea38f33",
            "currentConfirmations": 8,
            "targetConfirmations": 12,
            "amount": "0.0611",
            "unit": "BTC",
            "direction": "incoming"
        }
    }
}

New Confirmed Coins Transactions And Each Confirmation

Path Parameters

Query Parameters

Request Body Schema application/json

Response Schema

Callback parameters

Credits Cost : 400 Credits for 1 Results

Security schema

URL Schema

Request