Problems with RapidAPI R Code - 401 Error Encountered

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1

Struggling with authentication issues when using RapidAPI in R

I’m running into a 401 error every time I attempt to use the RapidAPI service through R. Despite the fact that my API key functions properly on the RapidAPI platform.

Here’s what I’ve done:

library(httr)

# Initial attempt using httr GET with custom headers
api_url <- "https://yh-finance.p.rapidapi.com/stock/v3/get-historical-data"
my_api_key <- "xyz"
host_name <- "yh-finance.p.rapidapi.com"

response <- GET(
  url = api_url,
  add_headers(
    `x-rapidapi-key` = my_api_key,
    `x-rapidapi-host` = host_name
  ),
  query = list(
    query = "TTF",
    region = "US"
  )
)

This setup results in a 401 error. I also tried constructing the URL directly:

# Alternative method - constructing the URL manually
base_api_url <- "https://yh-finance.p.rapidapi.com/stock/v3/get-historical-data"
complete_url <- paste0(base_api_url, "?query=TTF&region=US")

response_manual <- GET(
  complete_url,
  add_headers(
    `x-rapidapi-key` = my_api_key,
    `x-rapidapi-host` = host_name
  )
)

I’m still receiving the same 401 error. I can confirm that the API key works, as I’ve successfully accessed it via the RapidAPI web interface.

What could I be missing in my R implementation?

2

Same exact problem hit me six months back with a different RapidAPI endpoint. Turned out I’d botched copying my API key from the dashboard. Fixed it by generating a fresh key and triple-checking I didn’t grab any trailing spaces or weird characters when copying. Also check your subscription hasn’t expired - the web interface sometimes acts like everything’s fine even when your key’s dead. Print your API key variable in R and eyeball it character by character. Oh, and heads up - some RapidAPI endpoints need specific user agent headers, though that usually throws different error codes.

3

Had the same authentication nightmares with RapidAPI and Yahoo Finance in R. The parameter structure tripped me up - some endpoints want symbol instead of query even though the docs say otherwise. Also check if you need a higher subscription tier. I’ve had basic keys work in the web interface but fail on API calls for certain endpoints. Double-check your endpoint URL too - the historical data path changes between different RapidAPI providers. Try adding Content-Type: application/json to your headers, even for GET requests. Sometimes that fixes it.