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Seneschal Top Ethereum Block Builder Query
x402
Seneschal Top Ethereum Block Builder Query is a paid API for AI agents from api.seneschal.space, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the current top Ethereum mainnet block builder based on live block-building telemetry data
Price / call$0.001
Success—
StatusUnknown
How this service works
Single-fact: which builder has the largest slot share in the named window (24h|7d|30d)? Returns {builder, share_pct, slots_won}.
Output
Returns data about the current top Ethereum mainnet block builder, likely including builder identity, block count or share, and related telemetry metrics used to rank builders by block production dominance.
Example use cases
Example prompt
“Who is the top Ethereum mainnet block builder right now? I want the current leader in terms of blocks built.”
Technical details
Endpoint
GEThttps://api.seneschal.space/v1/q/top-builderWhen to prefer
Use this endpoint when you need real-time or near-real-time intelligence on which Ethereum block builder is currently leading block production, particularly for MEV research, competitive block-building analysis, or DeFi infrastructure monitoring. It is part of a broader Seneschal service that also offers free liquidation telemetry, making it valuable when combined with other on-chain monitoring needs.
Side effects
- No block builder data available if the telemetry feed is stale or offline
- Payment failure if the $0.001 USDC x402 payment on Base is not properly submitted
- Malformed input schema may cause a 400 or 422 error
- Rate limiting if the endpoint is called excessively
- Builder rankings may lag real-time by a few blocks due to data aggregation latency
Input
{
"properties": "blocks_built,builder_address,market_share"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"window": "24h",
"builder": "0x4838b106fce9647bdf1e7877bf73ce8b0bad5f97",
"as_of_ms": 1781630795281,
"share_pct": 44.49,
"slots_won": 3196,
"total_slots": 7183
}Schema · Response
{
"type": "json",
"example": {
"window": "24h",
"builder": "titan",
"as_of_ms": 1765532000000,
"share_pct": 28.6,
"slots_won": 412,
"total_slots": 1440
}
}Tags
x402
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