Key Management System

Open-source Node.js SDK library

Crypto APIs KMS is an open-source Node.js software that provides full control of master private keys, master seeds, and mnemonics.

The KMS is a secure enterprise-grade solution for operating with digital assets, creating wallets and signing transactions locally without a network connection.

In addition, Crypto APIs product suite provides endpoints for syncing HD wallets (xPub, yPub, zPub), deriving wallet addresses, getting fee recommendations, preparing transactions, broadcasting locally signed transactions, and more.

Full control of private keys

Secure offline signing

Unlimited scalability

View it on GitHub

Secure KMS integrated with Crypto APIs infrastructure

A collection of powerful endpoints to securely manage wallet addresses and transactions.

Sync New HD Wallet (xPub, yPub, zPub)

POST

List Synced Addresses

GET

Derive And Sync New Receiving Addresses

POST

Derive And Sync New Change Addresses

POST

Prepare A UTXO-Based Transaction From HD Wallet (xPub, yPub, zPub)

POST

Prepare An Account-Based Transaction From HD Wallet (xPub, yPub, zPub)

POST

Broadcast Locally Signed Transaction

POST

List HD Wallet (xPub, yPub, zPub) Transactions

GET

Get HD Wallet (xPub, yPub, zPub) Assets

GET

View Docs

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "extendedPublicKey": "upub5Ei6bRNneqozk6smK7dvtXHC5PjUyEL4ynCfMKvjznLcXi9DQaikETzQjHvJC43XexMvQs64jxB1njMjCHpRZ4xQWAmv3ge9cVtjfsHmbvQ"
        }
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "limit": 50,
        "offset": 0,
        "total": 100,
        "items": [
            {
                "address": "0x9e91eb3a35b96f0f0fe71f3c17fe8d29eb406b16",
                "index": 1
            }
        ]
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "limit": 50,
        "offset": 0,
        "total": 100,
        "items": [
            {
                "address": "tb1qupysufr3palqvz08hk7seglvskkvah9hmt66s7",
                "addressFormat": "P2WPKH",
                "addressType": "change",
                "derivationType": "bip32",
                "index": "1"
            }
        ]
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "limit": 50,
        "offset": 0,
        "total": 100,
        "items": [
            {
                "address": "tb1q2sy5l2vn4p648g3ttjxegghp6w9nycvdxap4ef",
                "addressFormat": "P2WPKH",
                "addressType": "change",
                "derivationType": "bip32",
                "index": "1"
            }
        ]
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "additionalData": "yourAdditionalDataHere",
            "fee": "0.0000279",
            "feePerByte": "0.00000014",
            "locktime": 1781965,
            "replaceable": false,
            "size": 243,
            "vin": [
                {
                    "address": "tb1q8wus03xdv3t6aknmsnpd0jmeu7dgh93j34pj5a",
                    "change": 0,
                    "derivationIndex": 1,
                    "outputIndex": 1,
                    "satoshis": 10000,
                    "script": "00143bb907c4cd6457aeda7b84c2d7cb79e79a8b9632",
                    "sighash": "90cfeef03b2755586b8e81668d8009b16b34d48abf2968729892279222e8d893",
                    "transactionId": "ff59ac56616ece7498e62c7f9f957cfdd50f6f2a74402058154e3022e7617bf2"
                }
            ],
            "vout": [
                {
                    "address": "tb1qvx3fynjuctk475vgecetfck005fxh699mflshv",
                    "satoshis": 3094,
                    "script": "0014a3f1019940ce572681c43fd836db97036a85bc8f"
                }
            ]
        }
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "amount": "30000000000000",
            "dataHex": "0x0079006f00750072004100640064006900740069006f006e0061006c00440061007400610048006500720065",
            "derivationIndex": 0,
            "fee": {
                "gasLimit": "552020",
                "gasPrice": "2500000007",
                "maxFeePerGas": "2000000008",
                "maxPriorityFeePerGas": "2000000000"
            },
            "nonce": "0",
            "recipient": "0x041c594a0cc194e826bef5411b29c7f27001b7e3",
            "sender": "0x03654A9E78771442CAdf8DB37ae60D6a12bAEa9f",
            "sigHash": "40738814e379fd2b1923729c87ac80dddc6810a3f8f02fef05452251972ec83a",
            "transactionType": "access-list-transaction"
        }
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "transactionId": "347d96855d41b77f1e23048fff11c18e9fe699ee69b0b402338f34189734e0a2"
        }
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "limit": 50,
        "offset": 0,
        "total": 100,
        "items": [
            {
                "index": 1,
                "minedInBlockHash": "00000000407f119ecb74b44229228910400aaeb9f4e3b9869955b85a53e9b7db",
                "minedInBlockHeight": 1903849,
                "recipients": [
                    {
                        "address": "2MzakdGTEp8SMWEHKwKM4HYv6uNCBXtHpkV",
                        "amount": "0.000144",
                        "isMember": false
                    }
                ],
                "senders": [
                    {
                        "address": "2N5PcdirZUzKF9bWuGdugNuzcQrCbBudxv1",
                        "amount": "0.00873472",
                        "isMember": true
                    }
                ],
                "timestamp": 1582202940,
                "transactionHash": "1ec73b0f61359927d02376b35993b756b1097cb9a857bec23da4c98c4977d2b2",
                "transactionId": "4b66461bf88b61e1e4326356534c135129defb504c7acb2fd6c92697d79eb250",
                "fee": {
                    "amount": "0.00016932"
                }
            }
        ]
    }
}

{
    "apiVersion": "2021-03-20",
    "requestId": "601c1710034ed6d407996b30",
    "context": "yourExampleString",
    "data": {
        "item": {
            "fungibleTokens": [
                {
                    "amount": "0.100000000000000000",
                    "identifier": "0x101848d5c5bbca18e6b4431eedf6b95e9adf82fa",
                    "symbol": "WEENUS",
                    "type": "ERC-20"
                }
            ],
            "nonFungibleTokens": [
                {
                    "identifier": "0x90ca8a3eb2574f937f514749ce619fdcca187d45",
                    "symbol": "GA",
                    "tokenId": "0x000000000000000000000000000000000000000000000000000000000000195b",
                    "type": "ERC-721"
                }
            ],
            "confirmedBalance": {
                "amount": "0.008516447598774679",
                "unit": "ETH"
            }
        }
    }
}

View Docs

Flexible solution for key management

We never store your private keys or have access to them. Your keys, your coins.

1. Generate locally
Generate wallet addresses and private keys without network connection.
2. Store securely
Keep your private keys in a preferred secure offline storage.
3. Sign and broadcast
Sign transactions locally, prepare and broadcast with Crypto APIs.

Explore KMS

Custodial or non-custodial?

Flexibility to choose whether you keep the private keys or give them to your customers.

Crypto Taxes & Accounting

If you want to integrate cryptocurrency with your service or product, we recommend using Crypto APIs. Accessing the hardware wallet data of our customers, which definitely advanced our products' development, was a great help from Crypto APIs. Crypto APIs provides good services that help us accelerate the development of new features.

Accessing the hardware wallet data of our customers, which definitely advanced our products' development, was a great help from Crypto APIs.

Jenny Hsu, Market Director
AuthenTrend

We were very pleased when we discovered Crypto APIs. Now we have a trusted provider whose products proved to be reliable, effective and fast. Our business runs smoother with the help of Crypto APIs and our customers are extremely happy.

We were very pleased when we discovered Crypto APIs. Now we have a trusted provider whose products proved to be reliable, effective and fast.

Trayan Nikolov, Chief Product and Operating Officer
NEXO

After trying multiple different platforms, we were impressed by Crypto API's quality support and robust uptime. Crypto API is now our number one choice for blockchain gateway.

Xavier Hendrickx, Co-founder & CTO
NGrave

Crypto APIs have been a great help for us to enable accessing hardware wallet data of our customers, which significantly increased our value proposition. Their support and willingness to help their customer is amazing. Highly recommended if you're looking for any kind of crypto API.

Crypto APIs have been a great help for us to enable accessing hardware wallet data of our customers, which significantly increased our value proposition.

Narek Gevorgyan, Founder
CoinStats

Crypto APIs Blockchain Data is a reliable and fast provider. By using their APIs we can now easily and in a matter of milliseconds access any Blockchain data from top Blockchain protocols.

By using their APIs we can now easily and in a matter of milliseconds access any Blockchain data from top Blockchain protocols.

Michael Benisti, Head of Data
Ledger

Crypto APIs has an outstanding team that helped us successfully integrate their Blockchain products. We can now take advantage of the best crypto API available and our business has been scaling faster than before. Crypto APIs is without a doubt a leading company in their field that provides its products at a fair price.

We can now take advantage of the best crypto API available and our business has been scaling faster than before.

Sharan Nair, CBO
CoinSwitch

Crypto APIs provide a safe and reliable service with good customer support and extensive documentation that helps us access and verify relevant transaction and wallet data.

Jakub Sawczuk, Founder and CEO
AEM Algorithm

Choosing Crypto APIs has helped us to not only accelerate the progress of developing new features for our CoolWallet product but also while providing great stability. Their services are valuable to us and their products are offered at a fair price.

Crypto APIs has helped us to not only accelerate the progress of developing new features for our CoolWallet product but also while providing great stability.

Wesley Wen, Technical Director
CoolWallet

Crypto APIs is helping us support one of Gilded's key partners by providing Webhook notification service for transaction tracking. The robust feature set and white glove support were key factors in the success of our integration. Crypto APIs helps us focus on our core product offering and saves us a lot of hassle.

Тhe robust feature set and white glove support were key factors in the success of our integration. Crypto APIs helps us focus on our core product offering.

Gil Hildebrand, CEO
Gilded

Customers

Infrastructure optimized for growth

30+

Networks Supported

25ms

Avg Processing Time

25,000+ rq/s

Enterprise-ready

100+ TB

of Big Data

See how it works

Frequently Asked Questions

What is Crypto APIs?

Crypto APIs is a blockchain infrastructure layer that radically simplifies the development of blockchain and crypto related applications by providing all needed blockchain APIs. We provide fast, reliable, and unified API solutions to access real-time and historical data from crypto market and blockchain protocols.

What products does Crypto APIs offer?

Crypto APIs is a set of blockchain- and crypto-related products which can help you reduce your development and infrastructure costs. It's an infrastructure layer which significantly reduces your go to market time.

- Wallet as a Service - an MPC digital wallet that incorporates the best features, security and authorization processes on the market.
- Blockchain Data - Unified access to complex and dynamic blockchain data from a single point using REST APIs.
- Blockchain Events - monitor and be notified for webhooks on top blockchain protocols using unified requests and callbacks
- Node as a Service - shared and dedicated node infrastructure for top blockchains using JSON-RPC.
- Blockchain Tools - a collection of API endpoints that provide an easy connection with blockchains and perform certain operations.
- Blockchain Automations - forward automatically any received coins or tokens to a preferred main deposit address.
- Market Data - real-time and historical crypto market data in one place.

Who are our intended customers?

Crypto APIs product suite has multiple use cases. Our infrastructure is designed to best serve any SMEs, enterprises or crypto-enthusiasts who need quick, secure and reliable access to top blockchain nodes. You can check our website to see the crypto and blockchain products that we offer and for any questions, don't hesitate and contact our team.

Which blockchains, tokens and layers are supported?

Crypto APIs supports the following blockchains:

- Bitcoin
- Ethereum
- XRP
- Litecoin
- Bitcoin Cash
- Dash
- Dogecoin
- Ethereum Classic
- Zilliqa
- Zcash
- Binance Smart Chain
Check out our dedicated page with all supported blockchains, layers, tokens and exchanges.

Do you support testnet networks?

Yes, we support testnet networks for mutiple blockchains. We also offer a free subscription plan to be used over testnet networks.

Do you use one node per network?

We have a pool of nodes that we use, all hosted with us. If it happens one to go offline, there is always another one that will continue processing.

Do you use your own nodes or shared ones?

We don’t use shared nodes. The pool of nodes we use is owned by Crypto APIs.

How can I contact support?

You can contact our support team via Live Chat or Support Email. When you contact us, please use the email address associated with your Crypto APIs account, or the email added as a Team member in another Crypto APIs account.

Do you offer a free plan/trial/demo for Crypto APIs?

We do not offer trial or demo for Crypto APIs products. We do however offer a free subscription instead, which can be used over testing networks.

Can I use more than one Crypto APIs product at once?

Of course. It's an all in one subscription.

I need more custom settings for my subscription, is it possible?

Yes. We have a Custom option for subscription. To set it up you can directly discuss it with one of our representatives by contacting our team.

How can I pay for the service?

We accept payment methods such as debit and credit cards (Visa, MasterCard) by using our payment provider Stripe. We can also offer you an alternative way to pay for your subscription plan, such as wire transfers, pay with cryptocurrency or PayPal. For more information, contact our business development team at [email protected]

Are payments for Crypto APIs services recurring?

Yes, in the sense that paid subscriptions plans for Crypto APIs products require either regular monthly or yearly payments, or additional time range that suit your business.

Can I prepay for my subscription for longer?

Yes. For that purpose you can contact our team so that we can discuss how and for what period of time you would like to make your payment.

Do you offer discounts?

We may offer you a discount depending on your subscription. Only larger packages and subscriptions for a longer period of time (yearly) can apply for a discount. If you think your subscription is eligible for a Crypto APIs discount, contact our team right away!

What is “Rate per second”?

This rate sets a limit for requests that can be made per second. The default equals 10, which means at most 10 requests can be done in a second. Still, this logic does not apply to all time frames.

For 1 minute time you can use up requests equal for max 30 seconds, which means that 1 minute allows max 300 requests. The same logic goes for 1 hour, where you can use up requests equal for max 30 min, which means 9 000 requests.

How many credits does an endpoint cost?

You can see the credits cost for each endpoint in our official Documentation. Simply select the endpoint you want information for and the credits cost is displayed at the end of the page.

Key Management System

Open-source Node.js SDK library

Secure KMS integrated with Crypto APIs infrastructure

A collection of powerful endpoints to securely manage wallet addresses and transactions.

Flexible solution for key management

1. Generate locally

2. Store securely

3. Sign and broadcast

What we support

Mainnets and Testnets

Custodial or non-custodial?

Infrastructure optimized for growth

30+

25ms

25,000+ rq/s

100+ TB

Frequently Asked Questions

What is Crypto APIs?

What products does Crypto APIs offer?

Who are our intended customers?

Which blockchains, tokens and layers are supported?

Do you support testnet networks?

Do you use one node per network?

Do you use your own nodes or shared ones?

How can I contact support?

Do you offer a free plan/trial/demo for Crypto APIs?

Can I use more than one Crypto APIs product at once?

I need more custom settings for my subscription, is it possible?

How can I pay for the service?

Are payments for Crypto APIs services recurring?

Can I prepay for my subscription for longer?

Do you offer discounts?

What is “Rate per second”?

How many credits does an endpoint cost?

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