# Prepare Transactions Build the transaction, keep the keys. Send a sender, a recipient and an amount; Crypto APIs returns the unsigned transaction with the fee, nonce or inputs worked out, ready to sign on your own server and broadcast. - Unsigned: you sign - Coins, tokens and NFTs - Fees and nonces filled in ## Key facts | | | | --- | --- | | Endpoints | 14 | | Blockchains | 19 | | Chain families | EVM, UTXO, XRP, Solana, Tezos, Kaspa | | Custody | Non-custodial, you sign | | Free trial | 14 days, no card | ## Unsigned transactions for non-custodial wallets and payouts **Send coins.** Prepare a native coin transfer on EVM, UTXO, XRP, Solana, Tezos and Kaspa chains, without running a node to pick the inputs or the nonce. **Send tokens and NFTs.** Prepare fungible and non-fungible token transfers on EVM chains and Tron, SPL tokens on Solana, and FA1.2 and FA2 tokens on Tezos. **Sign where your keys live.** Sign the prepared transaction with the free offline signer on your own server. Your private keys never reach Crypto APIs. ## Make your first Prepare Transactions call Real paths and example responses from the API reference. Add your API key and run it. ### Coins · EVM ``` curl -X POST https://rest.cryptoapis.io/prepare-transactions/evm/ethereum/mainnet/native-coins \ -H "Content-Type: application/json" \ -H "X-API-Key: YOUR_API_KEY" \ -d '{"data":{"item":{"additionalData":"yourAdditionalStriingHere","amount":"2000000009340","nonce":"0","recipient":"0x0902a667d6a3f287835e0a4593cae4167384abc6","sender":"0x1d107b75353229768dff96051262ce0088a3e26b"}}}' ``` ### Coins · UTXO ``` curl -X POST https://rest.cryptoapis.io/prepare-transactions/utxo/bitcoin/mainnet/native-coins \ -H "Content-Type: application/json" \ -H "X-API-Key: YOUR_API_KEY" \ -d '{"data":{"item":{"additionalData":"yourAdditionalDataHere","locktime":0,"fromAddress":"tb1q7cer5fh3w656jpe30gudzjg05j0kmd48jwxhzh","feeOptions":{"priority":"standard","exactAmount":"0.00001"},"prepareStrategy":"minimize-dust"}}}' ``` ### Tokens · EVM ``` curl -X POST https://rest.cryptoapis.io/prepare-transactions/evm/ethereum/mainnet/fungible-tokens \ -H "Content-Type: application/json" \ -H "X-API-Key: YOUR_API_KEY" \ -d '{"data":{"item":{"amount":"1.09340","contract":"0xdAC17F958D2ee523a2206206994597C13D831ec7","nonce":"0","recipient":"0x534bd102153ef199abae8296a2fae4599fc44cdc","sender":"0x1d107b75353229768dff96051262ce0088a3e26b"}}}' ``` ## Every Prepare 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 | | --- | --- | --- | --- | | Prepare A Fungible Token Transfer From Address EVM | `POST /prepare-transactions/evm/{blockchain}/{network}/fungible-tokens` | Ethereum, Ethereum Classic, BNB Smart Chain, Polygon, Avalanche, Arbitrum, Optimism, Base | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-a-fungible-token-transfer-from-address-evm/post) | | Prepare Transaction From Address EVM | `POST /prepare-transactions/evm/{blockchain}/{network}/native-coins` | Ethereum, Ethereum Classic, BNB Smart Chain, Polygon, Avalanche, Arbitrum, Optimism, Base | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-transaction-from-address-evm/post) | | Prepare A Non Fungible Token Transfer From Address EVM | `POST /prepare-transactions/evm/{blockchain}/{network}/non-fungible-tokens` | Ethereum, BNB Smart Chain, Polygon, Avalanche, Arbitrum, Optimism, Base | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-a-non-fungible-token-transfer-from-address-evm/post) | | Prepare A Native Coin Transfer From Address Tron | `POST /prepare-transactions/evm/tron/{network}/native-coins` | Tron | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-a-native-coin-transfer-from-address-tron/post) | | Prepare A Non Fungible Token Transfer From Address Tron | `POST /prepare-transactions/evm/tron/{network}/non-fungible-tokens` | Tron | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-a-non-fungible-token-transfer-from-address-tron/post) | | Prepare A TRC-20 Token Transfer From Address Tron | `POST /prepare-transactions/evm/tron/{network}/trc20-tokens` | Tron | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-a-trc-20-token-transfer-from-address-tron/post) | | Prepare Transaction From Address UTXO | `POST /prepare-transactions/utxo/{blockchain}/{network}/native-coins` | Bitcoin, Bitcoin Cash, Dash, Litecoin, Dogecoin, Zcash | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-utxo/prepare-transaction-from-address-utxo/post) | | Prepare Transaction From Address XRP | `POST /prepare-transactions/xrp/{network}/native-coins` | XRP Ledger | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-xrp/prepare-transaction-from-address-xrp/post) | | Prepare A Native Coin Transfer From Address Solana | `POST /prepare-transactions/solana/{network}/native-coins` | Solana | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-solana/prepare-a-native-coin-transfer-from-address-solana/post) | | Prepare An SPL Token Transfer From Address Solana | `POST /prepare-transactions/solana/{network}/spl-tokens` | Solana | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-solana/prepare-an-spl-token-transfer-from-address-solana/post) | | Prepare An FA1.2 Token Transfer From Address Tezos | `POST /prepare-transactions/tezos/{network}/fa1-2-tokens` | Tezos | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-tezos/prepare-an-fa12-token-transfer-from-address-tezos/post) | | Prepare An FA2 Token Transfer From Address Tezos | `POST /prepare-transactions/tezos/{network}/fa2-tokens` | Tezos | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-tezos/prepare-an-fa2-token-transfer-from-address-tezos/post) | | Prepare A Native Coin Transfer From Address Tezos | `POST /prepare-transactions/tezos/{network}/native-coins` | Tezos | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-tezos/prepare-a-native-coin-transfer-from-address-tezos/post) | | Prepare Kaspa Transaction | `POST /prepare-transactions/kaspa/{network}/native-coins` | Kaspa | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-kaspa/prepare-kaspa-transaction/post) | ## Prepare Transactions works on 19 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) - [Kaspa](/chains/kaspa) ## Build the rest of the flow - [Offline Signer](/products/blockchain-api/offline-signer) — Sign on your own server, free and open source - [Broadcast Transactions](/products/blockchain-api/broadcast-transactions) — Send a transaction you signed yourself - [Blockchain Fees](/products/blockchain-api/blockchain-fees) — Fee recommendations and gas estimates ## Prepare Transactions questions **Which blockchains does Prepare Transactions support?** Prepare Transactions works on 19 blockchains: Bitcoin, Ethereum, XRP Ledger, Ethereum Classic, Bitcoin Cash, Dash, Litecoin, Dogecoin, Zcash, BNB Smart Chain, Polygon, Tron, Solana, Tezos, Avalanche, Arbitrum, Optimism, Base, Kaspa. Each chain's page lists its networks and its own endpoints. **Can I try Prepare Transactions for free?** Yes, for 14 days. The Blockchain API free trial includes Prepare 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). **Does the Prepare Transactions API support Solana or Bitcoin?** Yes. Prepare Transactions works on 19 blockchains: the EVM chains and Tron, Bitcoin and the other UTXO chains, XRP Ledger, Solana (coins and SPL tokens), Tezos and Kaspa. It builds the unsigned transaction, with the inputs or the nonce and the fee filled in, for you to sign on your own server and then broadcast. **Can I prepare ERC-20 token and NFT transfers, or only native coin transfers?** Yes, both. The Prepare Transactions API supports native EVM coin transfers as well as fungible token (ERC-20) and non-fungible token (NFT) transfers from any address. It builds the unsigned transaction payload ready for you to sign locally. **How do I go from a prepared transaction to a confirmed on-chain transaction?** Prepare the unsigned EVM transaction with Prepare Transactions, sign it, then submit it with the Broadcast Signed Transaction endpoint. You can also estimate gas costs beforehand using the EVM Blockchain Fees endpoint. **Can I estimate gas fees for an EVM transaction before sending it?** Yes. CryptoAPIs provides an EVM Blockchain Fees endpoint to retrieve current fee estimates so you can set gas parameters before signing and broadcasting. This pairs directly with the Prepare Transactions workflow. **Can I test what an EVM transaction will do before broadcasting it?** Yes. CryptoAPIs offers an EVM transaction simulation endpoint that lets you preview the outcome of a transaction before it is signed and broadcast. This helps you catch failures or unexpected results without spending gas on-chain. ## Pointers - [Blockchain API](/products/blockchain-api) - [All networks](/what-we-support) - [Pricing](/pricing) - [Developer portal](https://developers.cryptoapis.io/)