Fetch a block header by number, hash, or "latest" on Ethereum, Base, Arbitrum, O
Fetch a block header by number, hash, or "latest" on Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain: timestamp, miner, gas used/limit, base fee, transaction count, size. Public JSON-RPC, no API keys. POST a JSON body like: {"chain":"base","block":"latest"}
Answeringour last check, 2026-09-24
1 of 1checks answered this week
38 msmedian answer time
$0.003listed price per call
$0.003price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://keyronne.com/api/chain-block
| Category | Market data |
|---|---|
| Provider host | keyronne.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.003 | 38 ms |
Example input (from the provider)
{
"body": {
"block": "latest",
"chain": "base"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"properties": {
"body": {
"properties": {
"block": {
"description": "Block number, \"latest\" (default), or a 0x block hash."
},
"chain": {
"enum": [
"ethereum",
"base",
"arbitrum",
"optimism",
"polygon",
"bsc"
],
"type": "string"
}
},
"required": [
"chain"
],
"type": "object"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"type": "object"
},
"output": {
"properties": {
"baseFeeGwei": {
"type": "string"
},
"chain": {
"type": "string"
},
"gasUsed": {
"type": "integer"
},
"hash": {
"type": "string"
},
"number": {
"type": "integer"
},
"time": {
"type": "string"
},
"timestamp": {
"type": "integer"
},
"transactionCount": {
"type": "integer"
}
},
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}