ETH Gas Station API

Access gas price data from http://ethgasstation.info.
Access to the ETH Gas Station API is free, but rate limited if you are not using an API key. Head over to https://data.defipulse.com to learn how to gain unlimited access.
Gas Price
Returns the fast, standard and safe low prices, along with the current block. 
https://ethgasstation.info/api/ethgasAPI.json
Parameter
Description
api-key
Use an API key to avoid rate limiting.
Response:
{  
   "fast":50.0,
   "fastest":200.0,
   "safeLow":10.0,
   "average":20.0,
   "block_time":13.942307692307692,
   "blockNum":7403346,
   "speed":0.7090284960673774,
   "safeLowWait":13.4,
   "avgWait":1.8,
   "fastWait":0.5,
   "fastestWait":0.5
}
Response Object Details:
fast: Recommended fast(expected to be mined in < 2 minutes) gas price in x10 Gwei(divite by 10 to convert it to gwei)
fastest: Recommended fastest(expected to be mined in < 30 seconds) gas price in x10 Gwei(divite by 10 to convert it to gwei)
safeLow: Recommended safe(expected to be mined in < 30 minutes) gas price in x10 Gwei(divite by 10 to convert it to gwei)
average: Recommended average(expected to be mined in < 5 minutes) gas price in x10 Gwei(divite by 10 to convert it to gwei)
block_time: Average time(in seconds) to mine one single block
blockNum: Latest block number
speed: Smallest value of (gasUsed / gaslimit) from last 10 blocks
safeLowWait: Waiting time(in minutes) for safeLow gas price
avgWait: Waiting time(in minutes) for average gas price
fastWait: Waiting time(in minutes) for fast gas price
fastestWait: Waiting time(in minutes) for fastest gas price
Note: To convert the provided values to gwei, divide by 10.
Prediction Table
Returns estimate confirmation times for a range of gas prices from the EGS Prediction Page.
https://ethgasstation.info/api/predictTable.json
Parameter
Description
api-key
Use an API key to avoid rate limiting.
Response:
[  
   {  
      "gasprice":0.1,
      "hashpower_accepting":0.0,
      "hashpower_accepting2":0.0,
      "tx_atabove":231.0,
      "age":4.0,
      "pct_remaining5m":0.0,
      "pct_mined_5m":0.0,
      "total_seen_5m":3.0,
      "average":300,
      "safelow":100,
      "nomine":null,
      "avgdiff":0,
      "intercept":4.8015,
      "hpa_coef":-0.0243,
      "avgdiff_coef":-1.6459,
      "tx_atabove_coef":0.0006,
      "int2":6.9238,
      "hpa_coef2":-0.067,
      "sum":6.9238,
      "expectedWait":1000.0,
      "unsafe":1,
      "expectedTime":135.29
   },
   .......
]
Last updated 3 months ago
Parameter	Description
`api-key`	Use an API key to avoid rate limiting.