getSignaturesForAddress

Success excludes calls the provider does not implement — an optional method a provider declines to offer is a capability fact, not a failure, and is never scored as one.

Median latency per day. Gaps are periods with no measurement, drawn as gaps rather than joined across — a line through missing data invents a measurement that was never taken.

A degradation is a bucket where a provider fell away from ITS OWN median for this method over the window, not from the cohort's. A provider that is consistently slower than its peers is not degraded — it is slower, which the ranking already says. Buckets with fewer than 20 samples are skipped, because a claim about a provider cannot rest on a handful of calls, and adjacent bad buckets are merged so one outage reads as one incident.

Runnable as written, against a keyless public endpoint. Nothing here needs an API key.

curl -s https://api.mainnet-beta.solana.com \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"getSignaturesForAddress","params":["Vote111111111111111111111111111111111111111",{"limit":10}]}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getSignaturesForAddress",
  "params": [
    "Vote111111111111111111111111111111111111111",
    { "limit": 10 }
  ]
}

{
  "jsonrpc": "2.0",
  "result": [
    {
      "signature": "5Nx8kQ2vRt7mYw3pL9dF...",
      "slot": 372145830,
      "err": null,
      "memo": null,
      "blockTime": 1755168000
    }
  ],
  "id": 1
}