Chain Variables

---

Get Chain Variables

GET https://api.helium.io/v1/vars

Gets the current set of chain variables

Request

No Parameters

Response

200: OK

{
  "data": {
    "allow_zero_amount": false,
    "alpha_decay": 0.0035,
    "batch_size": 400,
    "beta_decay": 0.002,
    "block_time": 60000,
    "block_version": "v1",
    "chain_vars_version": 2,
    "consensus_percent": 0.1,
    "dc_payload_size": 24,
    "dc_percent": 0,
    "dkg_curve": "SS512",
    "election_bba_penalty": 0.001,
    "election_cluster_res": 4,
    "election_interval": 30,
    "election_removal_pct": 40,
    "election_replacement_factor": 4,
    "election_replacement_slope": 20,
    "election_restart_interval": 5,
    "election_seen_penalty": 0.0033333,
    "election_selection_pct": 1,
    "election_version": 3,
    "h3_exclusion_ring_dist": 6,
    "h3_max_grid_distance": 120,
    "h3_neighbor_res": 12,
    "max_open_sc": 2,
    "max_payments": 50,
    "max_staleness": 100000,
    "max_subnet_num": 5,
    "max_subnet_size": 65536,
    "max_xor_filter_num": 5,
    "max_xor_filter_size": 102400,
    "min_assert_h3_res": 12,
    "min_expire_within": 15,
    "min_score": 0.15,
    "min_subnet_size": 8,
    "monthly_reward": 500000000000000,
    "num_consensus_members": 16,
    "poc_centrality_wt": 0.5,
    "poc_challenge_interval": 60,
    "poc_challenge_sync_interval": 90,
    "poc_challengees_percent": 0.35,
    "poc_challengers_percent": 0.15,
    "poc_good_bucket_high": -70,
    "poc_good_bucket_low": -130,
    "poc_max_hop_cells": 2000,
    "poc_path_limit": 7,
    "poc_target_hex_parent_res": 5,
    "poc_typo_fixes": true,
    "poc_v4_exclusion_cells": 8,
    "poc_v4_parent_res": 11,
    "poc_v4_prob_bad_rssi": 0.01,
    "poc_v4_prob_count_wt": 0.0,
    "poc_v4_prob_good_rssi": 1.0,
    "poc_v4_prob_no_rssi": 0.5,
    "poc_v4_prob_rssi_wt": 0.0,
    "poc_v4_prob_time_wt": 0.0,
    "poc_v4_randomness_wt": 0.5,
    "poc_v4_target_challenge_age": 300,
    "poc_v4_target_exclusion_cells": 6000,
    "poc_v4_target_prob_edge_wt": 0.0,
    "poc_v4_target_prob_score_wt": 0.0,
    "poc_v4_target_score_curve": 5,
    "poc_v5_target_prob_randomness_wt": 1.0,
    "poc_version": 8,
    "poc_witnesses_percent": 0.05,
    "predicate_callback_fun": "version",
    "predicate_callback_mod": "miner",
    "predicate_threshold": 0.95,
    "price_oracle_height_delta": 10,
    "price_oracle_price_scan_delay": 3600,
    "price_oracle_price_scan_max": 90000,
    "price_oracle_public_keys": [
      "13Btezbvbwr9LhKmDQLgBnJUgjhZighEjNPLeu79dqBbmXRwoWm",
      "13CFFcmPtMvNQCpWQRXCTqXPnXtcsibDWVwiQRKpUCt4nqtF7RE",
      "1431WVQvoV7RAJpoLCaBrTKner1Soed4bk69DddcrHUTCWHV6pj",
      "136n9BEbreGUNgXJWtyzkBQcXiNzdMQ5GBoP8L2J6ZReFUAwUjy",
      "14sqAYg1qxzjKTtyHLYZdH6yDtA3KgyoARhWN1cvLZ94dZw5vEc",
      "145J6Aye86pKTJrUHREiXu7qqppZBcWY1bvWo8id7ZjxyuainYj",
      "13dUGHis1PdrSwxdseoyZKzQhc8WuWcueAWdT95sDVGDNhGRWV9",
      "14EzXp4i1xYA7SNyim6R4J5aXN1yHYKNiPrrJ2WEvoDnxmLgaCg",
      "147yRbowD1krUCC1DhhSMhpFEqnkwb26mHBow5nk9q43AakSHNA"
    ],
    "price_oracle_refresh_interval": 10,
    "reward_version": 2,
    "sc_grace_blocks": 100,
    "securities_percent": 0.35,
    "snapshot_interval": 720,
    "snapshot_version": 1,
    "var_gw_inactivity_threshold": 600,
    "vars_commit_delay": 1,
    "witness_refresh_interval": 10080,
    "witness_refresh_rand_n": 1000
  }
}

---

Get the value of a chain variable

GET https://api.helium.io/v1/vars/:name

Gets the value of the chain variable with the given name

Request

Path Parameters

param	Type	Note
name (optional)	string	The name of a chain variable

Response

200: OK

This fetched the block_time chain variable

{
  "data": 60000
}

---

List chain variable activity

GET https://api.helium.io/v1/vars/activity

Lists all chain variable transaction activity. This route is paged using a cursor.

Request

Query Parameters

param	Type	Note
cursor (optional)	string	Cursor for the next page to fetch

Response

200: OK

{
  "data": [
    {
      "cancels": [],
      "hash": "FXLaw6csD1q_sRU9oyk6Vz6p47vBIhVPhSDcIEGXPiQ",
      "height": 365778,
      "key_proof": "",
      "master_key": null,
      "nonce": 28,
      "proof": "MEUCIF255lwe5je1GMM5OdWAbc86sZ5xaU3-75VSjILrVZ0GAiEAjpFTh7bSvrZV4fC2vnFN7KKG3bsBUhdBDe6JRUJ-AyM",
      "time": 1591646992,
      "type": "vars_v1",
      "unsets": [],
      "vars": {
        "price_oracle_height_delta": 10,
        "price_oracle_price_scan_delay": 3600,
        "price_oracle_price_scan_max": 90000,
        "price_oracle_public_keys": "IQEgHuJGDwcAoZZsw1rNcZIpbsIrVqihXfFEKX2g5YLNjCEBIO1OyYQtE8A+UdHQnGfgiTPBoA9g7qAq665jgMcUmt4hAY+mQWlLOM6dVi7hrugbt5H4Mo3SkJv+UOHwpKTVDJJkIQEUgzPrDa98YpqHWsRTDnbfvd2atT5pt4d5aWUzo3fOhCEB/oFGezNl0OBjrD5+/DuCVF3n1vjPi1SeeOgGCHnzGc0hAZTW/LUBIchFlJIiHRZbbBASIS0A0mT907FOUnF6lS/wIQFaM7GI+z26SkZoPG510rm0As7zf9ZlGLS+o50txhXIwiEBqtvQSZyN25QHlP3RQjDaW0fo9Mb97CjJWnA97JxF620hAZrrw1ilYRXLAaFgR+zBvDK51g8OVj31g24WlggwrmhC",
        "price_oracle_refresh_interval": 10
      },
      "version_predicate": 0
    },
    {
      "cancels": [],
      "hash": "J-c9UpTKIXtnDtLOJihaI7F99nrXa1IDbymVVgsugvM",
      "height": 352052,
      "key_proof": "",
      "master_key": "1Wh4bh",
      "nonce": 27,
      "proof": "MEQCIEkPl2ekYjQRvNwp3CQ9wnu3nHvuiDHCs4bNkK7kntyUAiB_0fspgA60E6TNViasYBuTcla06__jpxFGMpsWPnJ3xA",
      "time": 1590705257,
      "type": "vars_v1",
      "unsets": [],
      "vars": {
        "snapshot_interval": 720,
        "snapshot_version": 1
      },
      "version_predicate": 0
    },
    {
      "cancels": [],
      "hash": "UI2IoTs4eXA68wKyL8059alByHjszUU3GMgj7Ef9Uc4",
      "height": 339406,
      "key_proof": "",
      "master_key": "1Wh4bh",
      "nonce": 26,
      "proof": "MEUCIHhP-ADAk1dpz4NB1_RaHapWCBTMxRR8m0Fg4_Pq9ea-AiEAqgnPEc09kclYyv7LO3NT93fb-KbjgK4YOIQYiUm_ero",
      "time": 1589921323,
      "type": "vars_v1",
      "unsets": [],
      "vars": {
        "witness_refresh_interval": 10080,
        "witness_refresh_rand_n": 1000
      },
      "version_predicate": 0
    }
  ]
}