# Polygon API

The Crypto APIs Polygon API, part of the Blockchain API, lets you read balances, token transfers and blocks on Polygon and send transactions without running a node. One API key covers mainnet and amoy. Webhooks tell your server when a payment confirms, and we never hold your private keys.

## Key facts

| | |
| --- | --- |
| Networks | Mainnet, Amoy |
| Model | Account (EVM) |
| Endpoints | 44 |
| Confirmations webhook | Yes, per address |
| Custody | Non-custodial, you sign |
| Free trial | 14 days, no card |

## How do I get the latest Polygon block?

Send one GET request with your API key; the same request works on amoy when you replace mainnet with amoy in the path.

```
curl https://rest.cryptoapis.io/blocks/evm/polygon/mainnet/latest/details \
  -H "X-API-Key: YOUR_API_KEY"
```

## Which Polygon endpoints are available?

The main calls. Every path takes the network: mainnet or amoy.

| What it does | Method and path | Reference |
| --- | --- | --- |
| Latest block | `GET /blocks/evm/polygon/mainnet/latest/details` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/blocks-evm/get-last-mined-block-evm/get) |
| Block by height | `GET /blocks/evm/polygon/mainnet/height/{blockHeight}/details` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/blocks-evm/get-block-details-by-block-height-evm/get) |
| Address balance | `GET /addresses-latest/evm/polygon/mainnet/{address}/balance` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/address-latest-evm/get-address-balance-evm/get) |
| Transactions of an address | `GET /addresses-latest/evm/polygon/mainnet/{address}/transactions` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/address-latest-evm/list-confirmed-transactions-by-address-evm/get) |
| Token transfers of an address | `GET /addresses-latest/evm/polygon/mainnet/{address}/tokens-transfers` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/address-latest-evm/list-confirmed-tokens-transfers-by-address-evm/get) |
| Transaction by hash | `GET /transactions/evm/polygon/mainnet/{transactionHash}` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/transactions-data-evm/get-transaction-details-by-transaction-hash-evm/get) |
| Fee recommendations | `GET /blockchain-fees/evm/polygon/mainnet/mempool` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/blockchain-fees-evm/get-fee-recommendations-evm/get) |
| Prepare an unsigned transaction | `POST /prepare-transactions/evm/polygon/mainnet/native-coins` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/prepare-transactions-evms/prepare-transaction-from-address-evm/post) |
| Broadcast a signed transaction | `POST /broadcast-transactions/polygon/mainnet` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/broadcast-locally-sign-transactions/broadcast-locally-signed-transaction/post) |
| Webhook on a confirmed payment | `POST /blockchain-events/polygon/mainnet/address-coins-transactions-confirmed` | [Docs](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/create-subscriptions-for/new-confirmed-coins-transactions/post) |

## Polygon API questions

**Is there a free Polygon API?** You can try it free for 14 days. The Blockchain API free trial covers Polygon and every 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.

**How do I get the balance of a Polygon address?** Call the address balance endpoint with the address; it returns the confirmed POL balance. Token balances live in the token contracts, so list the address's token transfers to see them.

**How do I broadcast a Polygon transaction?** Sign the transaction on your own server, then send the signed raw transaction to the broadcast endpoint, authenticated with your API key, and Crypto APIs pushes it to the Polygon network and returns the transaction ID. We can prepare the unsigned transaction for you first.

**Do you support Polygon amoy?** Yes. Every Polygon endpoint works on mainnet and amoy. Change mainnet to amoy in the path; the same API key works on both.

**What makes Polygon different to work with?** It is an account-model EVM chain — every address has a single balance and a nonce. Tokens live in their own contracts rather than in the account balance, so reading them means calling the token contract; and every transaction needs the account's next nonce, which the same API returns.

**How do I know when a Polygon transaction is confirmed?** Create a webhook subscription for the address. Crypto APIs calls your URL when a transaction to or from it confirms on Polygon.

## Blockchain for a decentralized future

Polygon is a layer 2 Ethereum blockchain scaling solution that offers quick transactions and low fees. It connects Ethereum-compatible blockchains into a multi-chain system.

Polygon aims to contribute to a decentralized future by enabling developers to build dApps faster, safer and cheaper. By providing the needed infrastructure it fosters the growth of Web 3 applications.

| About Polygon | |
| --- | --- |
| Released | 2017 |
| Consensus | Polygon Proof of stake (PoS) |
| Block time | ~ 2.3 seconds |
| Smart contracts | Yes |

## Other EVM chains, same request shape

- [Ethereum API](/chains/ethereum)
- [BNB Smart Chain API](/chains/binance-smart-chain)
- [Arbitrum API](/chains/arbitrum-one)

## Pointers

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