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Seneschal Proposer Payment Query
x402
Seneschal Proposer Payment Query is a paid API for AI agents from api.seneschal.space, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the actual ETH payment received by the latest Ethereum block proposer (priority fees + direct coinbase transfers) along with 1-hour aggregate statistics
Price / call$0.001
Success—
StatusUnknown
How this service works
Single-fact: what did the proposer of the latest block ACTUALLY get paid (priority fees + direct coinbase transfers — the value that reaches the validator, not the noisy block-value proxy)? Returns {block, proposer_payment_eth, builder, tx_count} plus a 1h aggregate {samples, mean_eth, median_eth, p90_eth, max_eth}. Per-block history export: /v1/premium/builder-bids.csv ($0.05, CSV or JSONL).
Output
Returns a JSON object with: block number, proposer_payment_eth (actual ETH paid), proposer_payment_wei, builder identity, tx_count, timestamp fields (ts_ms, as_of_ms, source_freshness_s), a history_endpoint link, and a 1h aggregate object containing samples count, mean_eth, median_eth, p90_eth, and max_eth.
Example use cases
Example prompt
“What did the proposer of the latest Ethereum block actually get paid — including priority fees and direct coinbase transfers — and what does the 1-hour aggregate look like for mean, median, and p90 proposer payments?”
Technical details
Endpoint
GEThttps://api.seneschal.space/v1/q/proposer-paymentWhen to prefer
Use this endpoint when you need the true validator/proposer payment (priority fees plus direct coinbase transfers) rather than the commonly used but noisy block-value proxy. Ideal for MEV research, validator yield analytics, block builder competitive analysis, or any application requiring accurate on-chain proposer economics rather than estimates.
Side effects
- No recent block data available — returns stale or empty result if chain is not synced
- Rate limiting or payment failure via x402 protocol returns 402 Payment Required
- Missing or malformed query parameters return 400 Bad Request
- Service unavailable returns 503 if the underlying block data feed is down
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"hour": {
"max_eth": 0.41,
"p90_eth": 0.0388,
"samples": 291,
"mean_eth": 0.0182,
"median_eth": 0.0121
},
"block": 23012001,
"ts_ms": 1765531988000,
"builder": "titan",
"as_of_ms": 1765532000000,
"tx_count": 309,
"history_endpoint": "/v1/premium/builder-bids.csv",
"source_freshness_s": 9,
"proposer_payment_eth": 0.010354286,
"proposer_payment_wei": "10354286568285197"
}
}Tags
x402
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