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Seneschal Builder Bid Query
x402
Seneschal Builder Bid 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).
Retrieves the current Ethereum mainnet block builder bid from Seneschal's MEV-boost compatible block builder
Price / call$0.001
Success—
StatusUnknown
How this service works
Single-fact: percentile bid value (in ETH) for `builder` over the window. Returns {value_eth, samples}.
Output
Returns the current builder bid from Seneschal's Ethereum mainnet block builder, including the bid value, block payload metadata, and related MEV data useful for validators or block proposers evaluating builder bids.
Example use cases
Monitor MEV boost builder bids
“Can you check what the current block builder bid is from Seneschal's Ethereum mainnet block builder and let me know if it looks competitive?”
Evaluate validator block proposal
“I'm running a validator and need to decide whether to accept a builder bid — pull the latest bid from Seneschal's block builder so I can see the bid value and payload details.”
Track block building activity
“Keep an eye on Seneschal's Ethereum block builder for me and tell me whenever the current builder bid changes significantly in value.”
Technical details
Endpoint
GEThttps://api.seneschal.space/v1/q/builder-bidWhen to prefer
Use this endpoint when you need to query a live Ethereum mainnet block builder bid, particularly in MEV-boost validator setups or when monitoring block building activity. Prefer Seneschal's builder if you also use their private payment watch service and want a unified payment model via x402 USDC on Base.
Side effects
- No current bid available if no block is being actively built
- Payment required (402) if USDC x402 balance is insufficient
- Invalid or malformed query parameters return 400 error
- Builder temporarily offline or between slots returns empty response
- Rate limiting if too many requests in short succession
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"samples": 412,
"value_eth": 0.22
}
}Tags
x402
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