Blockchain API · REST + webhooks

Blockchain API for 35+ networks

The Crypto APIs Blockchain API lets your app read and send crypto on 35+ networks without running nodes. One REST API covers balances, transactions, fees and sending. Webhooks (alerts sent to your server) flag every deposit. You create addresses from an xPub (a wallet's public key) and sign on your servers, so we never hold your keys.

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14-day free trial, no card Non-custodial One API key

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How it works · non-custodial

How do you send a transaction without giving up your keys?

Six steps with one API key, and your keys stay on your servers for the whole loop. Pick a step to see the call.

1. ReadBalances, transactions, blocks and tokens on 35+ networks.
2. Derive xPubCreate receiving addresses from your xPub. It is a public key, so no custody.
3. PrepareGet an unsigned transaction with the fee already set.
4. Sign locallyOn your servers with our free MIT signer. Your key never leaves your process.
5. BroadcastPush the signed transaction to the network. One request shape on every chain.
6. WebhooksGet a webhook when a deposit arrives or a transaction confirms.

curl https://rest.cryptoapis.io/addresses-latest/
  evm/tron/mainnet/TQn9…kEx/balance \
  -H "X-API-Key: YOUR_API_KEY"

200 OKExample response

{
  "confirmedBalance": {
    "amount": "1520.45",
    "unit": "TRX"
  }
}

Read. Balances, transactions, blocks and tokens on 35+ networks.

curl "https://rest.cryptoapis.io/utils/bitcoin/mainnet/
  xpubs/xpub6CUG…Jm9/derive-addresses?addressFormat=p2wpkh
  &addressesCount=1&isChange=false&startIndex=0" \
  -H "X-API-Key: YOUR_API_KEY"

200 OKExample response

{
  "addresses": [
    { "address": "bc1q…7x3k", "index": 0 }
  ]
}

Derive xPub. Create receiving addresses from your xPub. It is a public key, so no custody.

curl -X POST https://rest.cryptoapis.io/
  prepare-transactions/evm/tron/mainnet/trc20-tokens \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"data":{"item":{"sender":"TQn9…kEx",
      "recipient":"TXm4…a2P","amount":"250.00",
      "contract":"TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t"}}}'

200 OKUnsigned: nothing can move yet

{
  "rawDataHex": "0a026afd…8e40",
  "transactionId": "4043bc60…c51d"
}

Prepare. Get an unsigned transaction with the fee already set.

// npm i @cryptoapis-io/offline-signer
// Runs on your server: no API key, no network call.
import { tronSignUnsignedHex } from "@cryptoapis-io/offline-signer/tron";

const { signedTransactionHex } = tronSignUnsignedHex({
  unsignedTransactionHex: rawDataHex,
  privateKey: process.env.TRON_PRIVATE_KEY,
});

Signed on your serverYour private key stayed with you

Sign locally. On your servers with our free MIT signer. Your key never leaves your process.

curl -X POST https://rest.cryptoapis.io/
  broadcast-transactions/tron/mainnet \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"data":{"item":{"signedTransactionHex":"0a02…f29b01"}}}'

201 CreatedExample response

{
  "transactionId": "347d9685…e0a2"
}

Broadcast. Push the signed transaction to the network. One request shape on every chain.

curl -X POST https://rest.cryptoapis.io/blockchain-events/
  tron/mainnet/address-tokens-transactions-confirmed \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"data":{"item":{"address":"TXm4…a2P",
      "receiveCallbackOn":3,
      "callbackUrl":"https://your.app/hooks/deposits"}}}'

201 CreatedExample response

{
  "referenceId": "c748624f…f524",
  "isActive": true,
  "eventType": "ADDRESS_TOKENS_TRANSACTION_CONFIRMED"
}

Webhooks. Get a webhook when a deposit arrives or a transaction confirms.

Capabilities

What can you build with the Blockchain API?

Each capability has its own page with endpoints, examples and credit costs.

API reference

Blockchain data

Balances, transaction history, blocks and tokens in one response shape on every network.

Blockchain data

xPub and HD wallets

Derive and sync addresses from an xPub, ypub or zpub. Track balances across the whole wallet.

xPub and HD wallets

Prepare transactions

Unsigned transactions for UTXO, EVM and Tron with fees set, ready for you to sign.

Prepare transactions

Broadcast transactions

Send signed raw transactions to 35+ networks with one endpoint shape.

Broadcast transactions

Webhooks

Address, token and confirmation events, signed and retried, sent to your URL.

Webhooks

Fee estimation

Slow, standard and fast fee estimates for each network, including Tron energy (the resource that pays USDT fees).

Fee estimation

Transaction simulator

See what a transaction will do before you sign it. Catch mistakes before they cost you.

Transaction simulator

Free offline signer

@cryptoapis-io/offline-signer signs EVM, UTXO, Tron, XRP, Kaspa and Solana transactions in your process. MIT licence.

npm i @cryptoapis-io/offline-signer

Also in the API Address history Transactions data Block data Contracts Blockchain utils Market data AI compatibility

35+ networks

Which blockchains does the API support?

Mainnets and testnets for Bitcoin, EVM chains, Tron, Solana, XRP Ledger and more. Every chain page has its endpoints and a working example.

See all networks

Bitcoin

Ethereum

TRON

Solana

BNB Smart Chain

Polygon

XRP Ledger

Litecoin

Avalanche + 10 more

Stablecoins

Can I use it as a USDT API and USDC API?

Read stablecoin balances and transfers, prepare token transfers and get a webhook when USDT or USDC arrives. The same calls work for TRC-20, ERC-20 and BEP-20.

USDT on Tron (TRC-20), Ethereum (ERC-20) and BNB Chain (BEP-20)
USDC on Ethereum and other supported chains
Check if a USDT address is frozen before you credit it Soon
Cut USDT TRC-20 fees with rented Tron Energy Soon

USDT API USDC API Free USDT checker Soon Tron Energy Soon

USDT on Tron · token transfers

curl https://rest.cryptoapis.io/addresses-latest/
  evm/tron/mainnet/TXm4…a2P/tokens-transfers \
  -H "X-API-Key: YOUR_API_KEY"

200 OKExample response

{ "items": [{
  "sender": "TQn9…kEx",
  "tokenData": {
    "symbol": "USDT", "standard": "TRC-20",
    "fungibleValues": { "amount": "250.00" }
  }
}] }

Compare

How does Crypto APIs compare with Tatum, Moralis and Blockdaemon?

A short, sourced comparison for teams looking for a Tatum, Moralis or Blockdaemon alternative.

Crypto APIs

Tatum

Moralis

Blockdaemon

Free trial or free tier

14-day free trial: mainnet and every feature, no card

100K lifetime credits, 3 requests a second

No free plan; trial on request

Free plan: 1M CU a month, one test key

Lowest paid plan

Starter $49 / month

Starter from $49 / month

Starter $149 / month

Starter; price not published

Above your plan

Prepaid packs at your subscription's rate; calls keep working

Auto-upgrade to the next tier, or keys stop

Published overage per million CU

Overage price not published

Prepare and broadcast transactions

Yes, and you sign locally

Transaction and broadcast APIs

Data API only; signed transactions go through RPC

Transaction API, plus MPC key management

Self-serve signup

Email, Google or GitHub

Email or Google

Email, Google or GitHub

Networks claimed

35+

130+ (RPC)

40+

50+

Checked on each vendor's public pages and docs on 27 Oct 2026. Tatum claims more chains; pick it if chain count matters most.

Compare with alternatives Crypto APIs vs Tatum Coming soon Crypto APIs vs Moralis Coming soon Crypto APIs vs Blockdaemon Coming soon

Pricing

How much does the Blockchain API cost?

Start with a 14-day free trial. Subscriptions are in credits and billed on the 1st of each month. If your credits run out, prepaid packs keep your calls working.

See full pricing

Free trial · 14 days

Mainnet, testnets, every feature
No card needed

Start free

Starter

$49/ month

30,000,000 credits a month
700 requests a second
Prepaid packs when credits run out

See full pricing

Scale

$299/ month

200,000,000 credits a month
2,100 requests a second
Prepaid packs when credits run out

See full pricing

Pro

$799/ month

600,000,000 credits a month
6,300 requests a second
Prepaid packs when credits run out

See full pricing

Custom

Let's talk

Credits and limits set for you
Same products and API key
Invoice billing available

Talk to sales

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

Michael BenistiHead of Data, Ledger

Security

Crypto APIs, Inc. is a US company (Delaware) serving exchanges, wallets and fintechs since 2018.

FAQ

Blockchain API questions

What is a blockchain API?

A blockchain API lets your app read and write blockchain data over HTTPS without running nodes. With Crypto APIs you call one REST API for balances, transactions and blocks, and you prepare and broadcast transactions on 35+ networks.

Is the Blockchain API non-custodial?

Yes. You derive addresses from an xPub (a public key), we prepare unsigned transactions, you sign them on your own servers with @cryptoapis-io/offline-signer, and we broadcast them. We never see or hold your private keys.

Which networks does it support?

35+ networks, including Bitcoin, Ethereum, Tron, Solana, BNB Smart Chain, Polygon, XRP Ledger and Litecoin, plus their main testnets. Each chain has its own page with endpoints and examples.

Does it support USDT and USDC?

Yes. Read USDT and USDC balances and transfers, prepare token transfers and get webhooks when tokens arrive, for example USDT on Tron (TRC-20) and Ethereum (ERC-20).

Is there a free trial?

Yes. Every account can start one 14-day free trial for each product. Mainnet, testnets and every feature are included, and no card is needed. The trial ends after 14 days or when its credits run out, whichever comes first. Then calls that use credits stop, testnet included, until you choose a subscription.

How much does the Blockchain API cost?

Subscriptions are in credits and billed on the 1st of each month; see the pricing page for each one's price and credits. Custom subscriptions are for large volume. If your credits run out and pay-as-you-go is on, a prepaid pack is added and billed to you at your subscription's pay-as-you-go rate, and your calls keep working.

Make your first call in 10 minutes

14-day free trial, mainnet included. No card needed.

Start free trial Talk to sales