| Protocol       | Network        | Path Parameter            |
|----------------|----------------|---------------------------|
| Avalanche      | Mainnet-c     | `avalanche/mainnet-c`    |
|                | Testnet-c     | `avalanche/testnet-c`    |
| Bitcoin        | Mainnet       | `bitcoin/mainnet`        |
|                | Testnet       | `bitcoin/testnet`        |
|                | Testnet4      | `bitcoin/testnet4`       |
| Bitcoincash    | Mainnet       | `bitcoincash/mainnet`    |
|                | Testnet       | `bitcoincash/testnet`    |
| Dogecoin      | Mainnet       | `dogecoin/mainnet`       |
|                | Testnet       | `dogecoin/testnet`       |
| Ethereum      | Mainnet       | `ethereum/mainnet`       |
|                | Sepolia       | `ethereum/sepolia`      |
|                | Hoodi         | `ethereum/hoodi`        |
| Litecoin      | Mainnet       | `litecoin/mainnet`       |
|                | Testnet       | `litecoin/testnet`       |
| Optimism      | Mainnet       | `optimism/mainnet`       |
| Polkadot      | Mainnet       | `polkadot/mainnet`       |
|                | Westend       | `polkadot/westend`      |
| Polygon       | Mainnet       | `polygon/mainnet`        |

protocol

string

required

Defaults to bitcoin

Protocol handle, one of: `avalanche`, `bitcoin`, `bitcoincash`, `dogecoin`, `ethereum`,`litecoin`, `optimism`, `polkadot`, `polygon`, `tezos`.

network

string

required

Defaults to mainnet

Which network to target. Available networks can be found in the list of supported protocols or with /{protocol}.

order

string

enum

Defaults to desc

The pagination order.

descasc

Allowed:

`desc``asc`

page_token

string

The token to retrieve more items in the next request. Use the `next_page_token` returned from the previous response for this parameter.

page_size

integer

Max number of items to return in a response.

Defaults to 25 and is capped at 100.

# ``200      Block headers

# ``400      Bad request

# ``401      Invalid or expired token

# ``429      Rate limit exceeded

# ``500      An internal server error happened

# ``503      The resource you are trying to access is currently unavailable

Base URL

https://svc.blockdaemon.com/universal/v1/{protocol}/{network}/block_identifiers

```
xxxxxxxxxx

curl --request GET \

--url 'https://svc.blockdaemon.com/universal/v1/bitcoin/mainnet/block_identifiers?order=desc' \

--header 'X-API-Key: ••••' \

--header 'accept: application/json'
```

application/json

``200``400``401``429``500``503