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1.3.x

Documentation

Introduction

CSPR.cloud is an enterprise-grade middleware platform aimed to super-charge developers and to be the primary way for dApps to interact with the Casper Network. It provides access to indexed and enriched blockchain data, real-time streaming subscriptions, and access to reliable and maintained Casper Node. The APIs include:

Indexed and normalized network data
Integrations with the existing fungible and non-fungible (NFT) token standards, such as CEP-18, CEP-47, and CEP-78
Support of the existing smart contract-level event standards, such as , which is also natively supported by the
Relevant off-chain data, such as CSPR rates or
and more

CSPR.cloud was built with developer experience in mind and expands the Casper Node RPC API with more data points and querying possibilities, which are not available via the native node API. You can check for examples in the section.

Reference

To get familiar with CSPR.cloud, we recommend that you read these documents:

Learn about the general technical aspects of CSPR.cloud API, and how it works
Learn how to make your first API request and start your integration with the Casper Network
Learn about CSPR.cloud API possibilities, which aren't present in the Casper Node RPC API

Support

If you have any questions or run into any issues while using the CSPR.cloud Web API, you can find help in the . Here you can connect and get help from other developers.

Legal

By using CSPR.cloud, you agree to our and acknowledge that you have read our .

Overview

CSPR.cloud REST API is an HTTP-based API that dApps can use to programmatically query Casper network data. It has predictable resource-oriented endpoints and uses standard HTTP response codes, authentication, and verbs.

CSPR.cloud Streaming API is WebSocket-based and follows the WebSocket standard conventions.

Base URLs

The APIs can be accessed using the following base URLs

Mainnet

API

Base URL

Testnet

API

Base URL

Authorization

The API is protected and requires access tokens to be provided with each request. The access tokens identify the API user and their corresponding access tier limits. Visit the page to learn more.

Rate limits and quotas

The API is rate-limited, with rate limits defined by the user access tier. The total number of requests to each of the APIs is limited by monthly and daily quotas. Visit the page to learn more.

Responses

The API sends data in the JSON format. Successful REST API responses contain the data property, which contains the response data:

The Streaming API messages additionally include the action and timestamp properties:

Pagination

Requests that potentially may return an unlimited number of items are paginated. Endpoints that return paginated responses accept the page and limit query parameters to control the page and the number of items per page, correspondingly. Paginated responses contain two additional properties providing information on the total number of items and the total number of pages:

Visit the page to learn more.

Sorting

Some of the endpoints that return paginated responses provide a possibility to sort the results. Sorting is controlled by the order_by and order_direction query params. Visit the page to learn more.

Filtering

Some of the endpoints that return paginated responses provide a possibility to filter the results by certain properties. Available filter properties vary for different endpoints and are specified in the corresponding endpoint documentation. Visit the page to learn more.

Optional properties

Some of the endpoints provide a possibility to include optional properties into the responses using the includes query param. Visit the page to learn more.

Errors

Error responses contain the error property with optional code, message, and description properties providing more information about the error that occurred:

Visit the page to learn more.

Versions

This documentation covers CSPR.cloud V2. Click for CSPR.cloud V1 documentation, which will be deprecated soon.

Authorization

The CSPR.cloud API is exclusively available to registered users. To authorize your API requests, an access token is required. The access tokens identify the API user and their corresponding access tier limitations. Please visit the CSPR.cloud website to learn about the tiers and to submit an access token request. To learn more about rate limites and quotas please read the Rate limits and quotas documentation page.

Authorization header

The access token should be included in the Authorization header:

curl --request GET \
    'https://node.testnet.cspr.cloud/status' \
    --header "Authorization: 55f79117-fc4d-4d60-9956-65423f39a06a"

The access token provided in the example above is for the demonstration purposes only, and has limited capabilities.

To learn how to include the Authorization header in Casper SDKs to access the CSPR.cloud Casper Node please read the page.

Accessing from a browser

At this moment CPSR.cloud provides only the server side integration. By using your access token in a front-end application, you'll expose it to the world.

Reporting

You can request the usage report by sending an email from your registered account to .

Rate limits and quotas

At CSPR.cloud, we distinguish between rate limits and quotas to ensure efficient API management.

Rate limit

We impose a limit on the number of requests per minute. This measure helps manage load and avoid overloading our systems.

Errors

Requests made to our APIs can result in several different error responses. The following document describes error values.

Properties

The Error has the following properties:

Property

Type

Description

Highlights

CSPR.cloud indexes and normalizes on-chain data to improve developers' experience when building on the Casper Network. Below are examples that demonstrate some of the possibilities CSPR.cloud offers. For the full list, please see the API reference pages.

Including related entities Receive related entities in a single response to minimize the number of network requests needed to load the data
Including CSPR rates Include CSPR rates that were relevant at the moment of a transfer, contract call, or reward creation
Include account info information provided by the account owner in the responses that contain account identifiers
Query granular pieces of the auction data that interest you, like all account delegations or a list of the current era validators
Query fungible token data relevant to your dApp
Query NFT movements and ownership from CSPR.cloud while focusing on the core business value of your application
Check aggregated historical contract costs to provide your users with better pricing
Translate account hashes to the corresponding public key for accounts that were observed on the network
Translate account main purses to the account public keys to better trace the fund movements
Subscribe to contract-level events the contracts from your dApps emit to track and aggregate the off-chain state for a better user experience

Including CSPR rates

Often, when looking at the fiat value of a native token amount, we want it to be converted using the rate that was relevant at the moment when the corresponding action happened. CSPR.cloud REST API provides the possibility to do so when requesting data having the timestamp property and when it's semantically acceptable To learn more, visit the CSPR rate page.

In the example below, we include the USD to CSPR rate in the account delegation rewards response by calling the rate function with the USD currency ID as the argument in the includes query param:

curl -X 'GET' \
  'https://api.testnet.cspr.cloud/accounts/019aa4adcd6f58f92eb4c98c0245e5d86b61de4919245c23ae9e906a6df5d41b0c/delegation-rewards?includes=rate(1)' \
  -H 'accept: application/json' \
  -H 'authorization: 55f79117-fc4d-4d60-9956-65423f39a06a'

{
  "item_count": 38490,
  "page_count": 3849,
  "data": [
    {
      "amount": "139319",
      "era_id": 11774,
      "public_key": "019aa4adcd6f58f92eb4c98c0245e5d86b61de4919245c23ae9e906a6df5d41b0c",
      "rate": 0.04051209,
      "timestamp": "2023-12-20T12:55:54Z",
      "validator_public_key": "0106ca7c39cd272dbf21a86eeb3b36b7c26e2e9b94af64292419f7862936bca2ca"
    },
    {
      "amount": "186761050",
      "era_id": 11774,
      "public_key": "019aa4adcd6f58f92eb4c98c0245e5d86b61de4919245c23ae9e906a6df5d41b0c",
      "rate": 0.04051209,
      "timestamp": "2023-12-20T12:55:54Z",
      "validator_public_key": "017d96b9a63abcb61c870a4f55187a0a7ac24096bdb5fc585c12a686a4d892009e"
    },
    ...
    {
      "amount": "139010",
      "era_id": 11771,
      "public_key": "019aa4adcd6f58f92eb4c98c0245e5d86b61de4919245c23ae9e906a6df5d41b0c",
      "rate": 0.0403257,
      "timestamp": "2023-12-20T06:55:27Z",
      "validator_public_key": "0106ca7c39cd272dbf21a86eeb3b36b7c26e2e9b94af64292419f7862936bca2ca"
    }
  ]
}

Including account info

Accounts on Casper Mainnet and Testnet networks have the possibility to self-identify themselves in a decentralized with the smart contract. Many validators and contract owner accounts provide information about themselves to increase trust on the network.

CSPR.cloud REST API allows including account information to simplify the integration with the standard for dApps developers. Typically, account info standard data can be included in responses that contain account identifiers like account hashes or public keys.

In the example below, we'll include validator account info data in the account delegations API response. To demonstrate the possibility of , we'll request only the owner name and logo properties of the account info object.

Accessing auction data

CPSR.cloud provides granular access to the auction data, which is more convenient than parsing the results of the Casper RPC API method, through the following APIs:

De-anonymizing account hashes

While accounts are known to be recognized by their public keys, internally on-chain, they are uniquely identified by fixed-length accounts hashes derived from those public keys. Because of that, in certain contexts, we may know the account hash but not the public key. CSPR.cloud maintains the mapping between account hashes and the corresponding public keys to be able to "de-anonymize" the former when needed by requesting the public key as an optional property.

Let's have a look at the Transfer API, for example. The Transfer object only provides the recipient account hash:

curl -X 'GET' \
  'https://api.testnet.cspr.cloud/deploys/6117d9f92a40d3785b53145c68a118cf36b974b2803acf41cffce8630acd769c/transfers' \
  -H 'accept: application/json' \
  -H 'authorization: 55f79117-fc4d-4d60-9956-65423f39a06a'

{
  "data": [
    {
      "amount": "2000000000000",
      "deploy_hash": "6117d9f92a40d3785b53145c68a118cf36b974b2803acf41cffce8630acd769c",
      "from_purse": "uref-72653d09444d0b3bd27372247510e9346c39fa831a89008dd9ce849a7b2c15e2-007",
      "id": 1704899420700,
      "initiator_account_hash": "7dc2bcc676eba6196d16374e1a2dbfa1df336f779854d95a0b4e65de6d593158",
      "timestamp": "2024-01-10T15:10:36Z",
      "to_account_hash": "b85634e0695ac3b6a7792c2009377b4a405118571a9c64ab2c66048250fef36c",
      "to_purse": "uref-7bba21087353cf75a83234b07525efdf33f59a6d71da00021a4bb80b6ace4bd7-004",
      "transform_key": "a1845ce7b2d334c7fd39b6313ebcfe4e8e29889bcdc792f7c67c7ba5360fd220"
    }
  ],
  "item_count": 1,
  "page_count": 1
}

Let's "de-anonymize" the recipient of the transfer above by including the to_public_key optional property:

Note the to_public_key property that was added in the second response. It contains the public key that corresponds to the account hash specified in to_account_hash. Please check Transfer Optional Properties to learn about all the optional data that can be included in the responses.

De-anonymizing account purses

Similarly to , CSPR.cloud can also "de-anonymize" account purses which can be used as the only transfer source or destination parameter. Let's have a look at transfers that happened in this for example.

The to_account_hash was not specified in the transfer parameters. Let's "de-anonymize" it by including the to_purse_public_key :

Note the to_purse_public_key property that was added in the second response. It contains the public key that corresponds to the account having the to_purse as its main purse. Please check to learn about all the optional data that can be included in the responses.

REST API

Get auction metrics

GET /auction-metrics

Query params

None

Sorting

None

Optional properties

None

Response

Example

Create Awaiting Deploy

Creates awaiting deploy

Query params

None

Sorting

Add Awaiting Deploy signatures

Add more signatures to awaiting deploy

POST /awaiting-deploys/{deploy_hash}/approvals

Query params

None

Sorting

None

Optional properties

None

Response

Status [boolean]

Example

HTTP Status Created (201)

Get block

Get block by its identifier (block height or block hash)

Query params

None

Get validator blocks

Get paginated list of blocks proposed by the validator

Query params

None

Centralized account info

The CentralizedAccountInfo entity provides account information collected by CSPR.cloud team for the well-known accounts in the Casper ecosystem.

Properties

The CentralizedAccountInfo entity has the following properties:

Property

Type

Get centralized account info

Get centralized account info by account identifier.

Endpoint

GET /centralized-account-info/{account_identifier}

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get centralized account infos

Endpoint

Query params

Get contract

Get contract by its hash.

Query params

None

Sorting

Get contract types

Get all contract types with their id and name.

Query params

None

Contract entry point

The ContractEntryPoint entity offers a normalized representation of the Casper Network . Entry points are associated with the entity and describe how to interact with it. In CSPR.Cloud, only the name of the entry point and its relations to the Contract and ContractPackage are stored.

Properties

The ContractEntryPoint entity has the following properties:

Get contract entry points

Get contract entry points by contract hash

GET /contracts/{contract_hash}/entry-points

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get contract entry point costs

Get deploys costs and payment amounts, aggregated by contract hash and entry point name

GET /contracts/{contract_hash}/entry-points/{entry_point_name}/costs

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get total account delegation rewards

Get total amount of delegation rewards for an account.

GET /accounts/{public_key}/total-delegation-rewards

Query params

None

Sorting

None

Optional properties

None

Response

uint64

Example

Get total validator delegators' rewards

Get total amount of delegator rewards for a validator.

GET /validators/{public_key}/total-delegator-rewards

Query params

None

Sorting

None

Optional properties

None

Response

uint64

Example

Get contract package fungible token ownership

GET /contract-packages/{contract_package_hash}/ft-token-ownership

Query params

None

Sorting

None

Optional properties

Property

Type

Description

Response

Example

Get NFT

Get NFT by contract package hash and token ID

Query params

None

Get NFT standards

Query params

None

Sorting

Get off-chain NFT metadata statuses

Query params

None

Get NFT action types

GET /nft-token-action-types

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get the current currency rate

Get the current CSPR rate by currency identifier.

GET /rates/{currency_id}/amount

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get currencies

Get a paginated list of currencies.

GET /currencies

Query params

None

Sorting

None

Optional properties

None

Response

Example

Get supply

Get the latest CSPR supply

GET /supply

Query params

None

Sorting

None

Optional properties

None

Response

Example

curl -X 'POST' \ 'https://api.testnet.cspr.cloud/awaiting-deploys' \ -H 'accept: application/json' \ -H 'authorization: 55f79117-fc4d-4d60-9956-65423f39a06a' -d '{ "hash": "aa46828cd1b756686c2ed1af7fcd8ab0b37305a208164dd55aaf19d23607dfa9", "header": { "ttl": "30m", "account": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "body_hash": "3d5b08d531e9bd979d20f40b8ba74fc47ae5d209a42f64a345220661e5000254", "gas_price": 1, "timestamp": "2024-02-08T09:13:35.291Z", "chain_name": "casper-test", "dependencies": [] }, "payment": { "ModuleBytes": { "args": [ [ "amount", { "bytes": "0400f90295", "parsed": "2500000000", "cl_type": "U512" } ] ], "module_bytes": "" } }, "session": { "StoredContractByHash": { "args": [ [ "validator", { "bytes": "010e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7", "parsed": "010e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7", "cl_type": "PublicKey" } ], [ "amount", { "bytes": "050006e78aa5", "parsed": "711000000000", "cl_type": "U512" } ], [ "delegator", { "bytes": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "parsed": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "cl_type": "PublicKey" } ] ], "hash": "93d923e336b20a4c4ca14d592b60e5bd3fe330775618290104f9beb326db7ae2", "entry_point": "undelegate" } }, "approvals": [ { "signer": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "signature": "013815f5f7ca37cb16ffd1277afdc11e3bc765a072d839e9ebf1bf3798f3671c1cf77cb1d6c8367b6ab11a014829e4d03c4950721705fc0eec3f9e91fb9a8d180d" } ] }'

{ "deploy": { "hash": "aa46828cd1b756686c2ed1af7fcd8ab0b37305a208164dd55aaf19d23607dfa9", "header": { "ttl": "30m", "account": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "body_hash": "3d5b08d531e9bd979d20f40b8ba74fc47ae5d209a42f64a345220661e5000254", "gas_price": 1, "timestamp": "2024-02-08T09:13:35.291Z", "chain_name": "casper-test", "dependencies": [] }, "payment": { "ModuleBytes": { "args": [ [ "amount", { "bytes": "0400f90295", "parsed": "2500000000", "cl_type": "U512" } ] ], "module_bytes": "" } }, "session": { "StoredContractByHash": { "args": [ [ "validator", { "bytes": "010e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7", "parsed": "010e5669b070545e2b32bc66363b9d3d4390fca56bf52a05f1411b7fa18ca311c7", "cl_type": "PublicKey" } ], [ "amount", { "bytes": "050006e78aa5", "parsed": "711000000000", "cl_type": "U512" } ], [ "delegator", { "bytes": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "parsed": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "cl_type": "PublicKey" } ] ], "hash": "93d923e336b20a4c4ca14d592b60e5bd3fe330775618290104f9beb326db7ae2", "entry_point": "undelegate" } }, "approvals": [ { "signer": "0176197d7191ce519ed043221956a2227921abf30364d4362970229027ec828f04", "signature": "013815f5f7ca37cb16ffd1277afdc11e3bc765a072d839e9ebf1bf3798f3671c1cf77cb1d6c8367b6ab11a014829e4d03c4950721705fc0eec3f9e91fb9a8d180d" } ] } }

{ "data": [ { "contract_package_hash": "c4e5a03066ce3c6006f562939e48f7076c77de5d46cf8fe625c41e02c5e74814", "is_burned": false, "offchain_metadata": null, "offchain_metadata_status": 0, "onchain_metadata": { "asset": "https://maritime.sealstorage.io/make/c4e5a03066ce3c60/0a14a18a7a214b64a9da1e5bdfe12ded", "description": "Friday morning in Рíвне.", "name": "Friday morning in Rivne" }, "owner_hash": "8297d55f4530ac75f46d04319bf4c7d1de68de1b3fe31cd462f752fadf27b571", "owner_type": 0, "timestamp": "2022-10-31T07:20:42Z", "token_id": "1", "token_standard_id": 1, "tracking_id": 6053 }, { "contract_package_hash": "c4e5a03066ce3c6006f562939e48f7076c77de5d46cf8fe625c41e02c5e74814", "is_burned": false, "offchain_metadata": null, "offchain_metadata_status": 0, "onchain_metadata": { "asset": "https://maritime.sealstorage.io/make/c4e5a03066ce3c60/69a349373da14f6f9511e2a8d375657e", "description": "Dougal loving life on the edge", "name": "Flying Dougal" }, "owner_hash": "2af66211f9fb970ead08bb80d3d05ad385f83e51caf4940c2f2eb309a0427828", "owner_type": 0, "timestamp": "2022-11-15T16:54:36Z", "token_id": "10", "token_standard_id": 1, "tracking_id": 11228 }, ... { "contract_package_hash": "c4e5a03066ce3c6006f562939e48f7076c77de5d46cf8fe625c41e02c5e74814", "is_burned": false, "offchain_metadata": null, "offchain_metadata_status": 0, "onchain_metadata": { "asset": "https://maritime.sealstorage.io/ipfs/bafybeif6wojygvwuav4wdt7dyqx2ekem4fqdpx47p3fu2e5yh7y6anqr2u", "description": "The “Ghost” collection is a unique serie of NFTs found on the Casper blockchain. These NFTs are digital representations of ghosts, spirits, and paranormal phenomenon that have been meticulously designed and created by digital artists. Each NFT in this collection is a unique and exclusive piece that captures the essence of the supernatural and the mysterious.\n", "name": "Ghosts" }, "owner_hash": "a485e8c7fbe2bfd939930dd9d94025b403fe4bfcf0f8f46b31bd9f28298b8890", "owner_type": 0, "timestamp": "2023-10-07T08:31:23Z", "token_id": "1006", "token_standard_id": 1, "tracking_id": 317986 } ], "item_count": 1277, "page_count": 128 }

{ "data": [ { "contract_package_hash": "998af6825d77da15485baf4bb89aeef3f1dfb4a78841d149574b0be694ce4821", "deploy": { "args": { "recipient": { "cl_type": "Key", "parsed": { "Account": "account-hash-989ca079a5e446071866331468ab949483162588d57ec13ba6bb051f1e15f8b7" } }, "token_ids": { "cl_type": { "List": "U256" }, "parsed": [ "2" ] } }, "block_hash": "6dd2def46e2417f05dbbb3b8429099f20f89f7fb4b32d4e61fd5d79959ba35f8", "caller_public_key": "013eecc2f0fbcad01a35fca7ad0bf191a8cf1eb8d6b13ea63cb92a31e6c767c0bc", "contract_hash": "ff2f649f127c033d744f80e7c3bcf0561c716d8f6d1dadc0cd79d8b2d309c020", "contract_package_hash": "998af6825d77da15485baf4bb89aeef3f1dfb4a78841d149574b0be694ce4821", "cost": "801777450", "deploy_hash": "7ffa747cf92deace24a8f81f62ed01694271940ac16e20c419a56f47f680f0a5", "entry_point_id": 96622, "error_message": null, "execution_type_id": 4, "payment_amount": "1000000000", "status": "processed", "timestamp": "2022-10-28T13:40:14Z" }, "deploy_hash": "7ffa747cf92deace24a8f81f62ed01694271940ac16e20c419a56f47f680f0a5", "from_hash": "c1e4f35cf36553d9acca0fa02be97537f333c18783373e34d6932eb649584a8c", "from_type": 0, "nft_action_id": 4, "timestamp": "2022-10-28T13:40:14Z", "to_hash": "989ca079a5e446071866331468ab949483162588d57ec13ba6bb051f1e15f8b7", "to_type": 0, "token_id": "2", "token_tracking_id": 20709 }, { "contract_package_hash": "998af6825d77da15485baf4bb89aeef3f1dfb4a78841d149574b0be694ce4821", "deploy": { "args": { "token_meta_data": { "cl_type": "String", "parsed": "{\"token_uri\":\"ipfs://\"}" }, "token_owner": { "cl_type": "Key", "parsed": { "Account": "account-hash-d0bc9ca1353597c4004b8f881b397a89c1779004f5e547e04b57c2e7967c6269" } } }, "block_hash": "928a4518bd001cc4ba07a6405e2a2053c157a8a16f0df08668a8aa4d12b7ddbf", "caller_public_key": "016d9e3db0a800aef8d18975b469c77bef042ee909d24cb83d27df97a22bb6d8ad", "contract_hash": "4a2c7bda207ddf20487c13bd882a0773e1047c0544024bfae4a40e8769a8f452", "contract_package_hash": "e2e9be86fb0bef6f2df08c0e3b49cc66ce458a40e496e115f6dc984011177d16", "cost": "6398252230", "deploy_hash": "af1d08519310188c9746f090d7a0d999da13b58d64680086277bdecebfd29628", "entry_point_id": 117617, "error_message": null, "execution_type_id": 2, "payment_amount": "10381644690", "status": "processed", "timestamp": "2023-01-01T09:40:04Z" }, "deploy_hash": "af1d08519310188c9746f090d7a0d999da13b58d64680086277bdecebfd29628", "from_hash": null, "from_type": null, "nft_action_id": 1, "timestamp": "2023-01-01T09:40:04Z", "to_hash": "d0bc9ca1353597c4004b8f881b397a89c1779004f5e547e04b57c2e7967c6269", "to_type": 0, "token_id": "2", "token_tracking_id": 20709 } ], "item_count": 2, "page_count": 1 }

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