# Broadcast Transactions

Send a transaction you signed yourself. Post the signed raw transaction to one endpoint on any of 18 blockchains, and Crypto APIs pushes it to the network.

- You sign, we send
- One endpoint for every chain
- Optional callback URL

## Key facts

| | |
| --- | --- |
| Endpoints | 1 |
| Blockchains | 18 |
| Chain families | EVM, UTXO, XRP, Solana, Tezos |
| Custody | Non-custodial, you sign |
| Free trial | 14 days, no card |

## Broadcasting for wallets, exchanges and payouts

**Keep your keys in-house.** Sign on your own servers or hardware, then hand only the signed transaction to the API. Your private keys stay with you.

**Skip running nodes.** Reach 18 blockchains without operating, syncing or watching a node for each.

**Hear back.** Add a callback URL and a secret to the request, and Crypto APIs calls your URL about the transaction.

## Make your first Broadcast Transactions call

Real paths and example responses from the API reference. Add your API key and run it.

### Broadcast

```
curl -X POST https://rest.cryptoapis.io/broadcast-transactions/ethereum/mainnet \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"data":{"item":{"callbackSecretKey":"yourSecretString","callbackUrl":"https://example.com","signedTransactionHex":"0xf86a22827d00831e8480941b85a43e2e7f52e7…"}}}'
```

## Every Broadcast Transactions endpoint

Each operation links to its page in the API reference, with its parameters and responses. Paths take the blockchain and the network, so moving to another chain is a change of path.

| What it does | Method and path | Blockchains | Reference |
| --- | --- | --- | --- |
| Broadcast Locally Signed Transaction | `POST /broadcast-transactions/{blockchain}/{network}` | Bitcoin, Ethereum, XRP Ledger, Ethereum Classic, Bitcoin Cash, Dash, Litecoin, Dogecoin, Zcash, BNB Smart Chain, Polygon, Tron, Solana, Tezos, Avalanche, Arbitrum, Optimism, Base | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/broadcast-locally-sign-transactions/broadcast-locally-signed-transaction/post) |

## Broadcast Transactions works on 18 blockchains

Mainnets, and test networks where the chain has one. Open a chain for its own endpoints and quick start.

- [Bitcoin](/chains/bitcoin)
- [Ethereum](/chains/ethereum)
- [XRP Ledger](/chains/ripple)
- [Ethereum Classic](/chains/ethereum-classic)
- [Bitcoin Cash](/chains/bitcoin-cash)
- [Dash](/chains/dash)
- [Litecoin](/chains/litecoin)
- [Dogecoin](/chains/doge)
- [Zcash](/chains/zcash)
- [BNB Smart Chain](/chains/binance-smart-chain)
- [Polygon](/chains/polygon)
- [Tron](/chains/tron)
- [Solana](/chains/solana)
- [Tezos](/chains/tezos)
- [Avalanche](/chains/avalanche)
- [Arbitrum](/chains/arbitrum-one)
- [Optimism](/chains/optimism)
- [Base](/chains/base)

## Build the rest of the flow

- [Prepare Transactions](/products/blockchain-api/prepare-transactions) — Unsigned transactions, ready to sign on your server
- [Offline Signer](/products/blockchain-api/offline-signer) — Sign on your own server, free and open source
- [Blockchain Events](/products/blockchain-api/blockchain-events) — Webhooks when a transaction confirms or a block is mined

## Broadcast Transactions questions

**Which blockchains does Broadcast Transactions support?** Broadcast Transactions works on 18 blockchains: Bitcoin, Ethereum, XRP Ledger, Ethereum Classic, Bitcoin Cash, Dash, Litecoin, Dogecoin, Zcash, BNB Smart Chain, Polygon, Tron, Solana, Tezos, Avalanche, Arbitrum, Optimism, Base. Each chain's page lists its networks and its own endpoints.

**Can I try Broadcast Transactions for free?** Yes, for 14 days. The Blockchain API free trial includes Broadcast Transactions and every other feature, with no card. It ends after 14 days or when its credits run out; after that, calls need a subscription, listed on the [pricing page](/pricing).

**What is the CryptoAPIs Broadcast Transactions API and how does it work?** It lets you push a transaction you have already signed locally to the blockchain network through a single specialized endpoint. You keep your private keys on your side, sign the raw transaction offline, and CryptoAPIs relays the signed payload to a node for you. This means CryptoAPIs never handles your keys while still giving you node access for broadcasting.

**Does the Broadcast Transactions API support Solana and Bitcoin?** Yes. Solana is supported for broadcasting locally signed transactions, as are Bitcoin and the other UTXO chains (Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash). XRP and Kaspa are also covered, alongside the EVM chains.

**Can I broadcast transactions on testnets as well as mainnet?** Yes. Broadcasting works on both mainnets and testnets across the networks CryptoAPIs supports. For example EVM chains offer testnets such as Sepolia, Amoy, Fuji, Nile and Mordor, and UTXO chains such as Bitcoin, Litecoin and Dogecoin offer their standard testnets. Kaspa is currently mainnet only.

**Does broadcasting a transaction with CryptoAPIs mean they hold my private keys?** No. The model is non-custodial for signing: you sign the transaction locally with your own keys and only send the already-signed transaction to the broadcast endpoint. CryptoAPIs relays that signed payload to a node and never sees or stores your private keys.

## Pointers

- [Blockchain API](/products/blockchain-api)
- [All networks](/what-we-support)
- [Pricing](/pricing)
- [Developer portal](https://developers.cryptoapis.io/)