Where can I find out about /api/v2/txs/signed information?

[ocoderr]

i am working for a light wallet , now i want sent transaction to cardano node . i not find anything about how to send transaction. i read https://github.com/vacuumlabs/adalite/blob/master/server/transactionSubmitter.js find a code like this:

const response = await fetch(
        `${process.env.ADALITE_BLOCKCHAIN_EXPLORER_URL}/api/v2/txs/signed`,
        {
          method: 'POST',
          body: JSON.stringify(signedBody),
          headers: {
            'Content-Type': 'application/json; charset=utf-8',
          },
        }
      )

Someone knows what is ${process.env.ADALITE_BLOCKCHAIN_EXPLORER_URL}/api/v2/txs/signed means?
is it a cardano node url? i have install a cardano node with explorer api. looking for https://cardanodocs.com/technical/explorer/api/ not find /api/v2/txs/signed.

Where can I find out about api/v2/txs/signed information?

[pengpengliu]

I found this, hope it can help you. https://github.com/vacuumlabs/adalite-backend-service/blob/develop/src/routes.js#L234 And, this is work: https://explorer3.adalite.io/api/v2/txs/signed