curl --request POST \
  --url https://api.relay.link/transactions/single \
  --header 'Content-Type: application/json' \
  --data '
{
  "requestId": "<string>",
  "chainId": "<string>",
  "tx": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({requestId: '<string>', chainId: '<string>', tx: '<string>'})
};

fetch('https://api.relay.link/transactions/single', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.relay.link/transactions/single"

payload = {
    "requestId": "<string>",
    "chainId": "<string>",
    "tx": "<string>"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "message": "<string>"
}