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Seneschal Cheapest Flashloan Query
x402
Seneschal Cheapest Flashloan Query is a paid API for AI agents from api.seneschal.space, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).
Returns the cheapest available flash loan offer across DeFi protocols on Ethereum mainnet
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call services for the agent economy: a webhook the moment a Monero or Zcash payment lands at your address (view-key only), single-fact x402 data APIs, a paid public notice board, a stablecoin gas paymaster and a permissionless Ethereum block builder. No account, no API key — pay in USDC on Base or in XMR/ZEC.
Output
Returns data about the cheapest flash loan currently available, including the protocol offering it, the fee rate, and available liquidity for the requested asset parameters.
Example use cases
Cheapest flash loan for liquidation
“Before I trigger this undercollateralized position liquidation on mainnet, find me the cheapest flash loan available right now — I need the protocol, fee rate, and whether there's enough liquidity to cover the full liquidation amount.”
Compare flash loan rates across protocols
“I'm about to run an MEV strategy and need to know which protocol — Aave, dYdX, Uniswap, or anything else — is offering the lowest fee flash loan on Ethereum mainnet at this moment, and how much liquidity is on offer.”
Optimal flash loan source for arbitrage
“I've spotted a cross-DEX arbitrage opportunity on Ethereum and need to borrow 500k USDC uncollateralized — tell me which protocol has the cheapest flash loan for that asset right now so I can route the trade optimally.”
Technical details
Endpoint
GEThttps://api.seneschal.space/v1/q/cheapest-flashloan?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically find the lowest-cost flash loan on Ethereum mainnet before executing an MEV, arbitrage, or liquidation strategy. Particularly useful when integrated with Seneschal's block builder service, as the data is sourced from mainnet block-building telemetry.
Side effects
- No flash loan liquidity available for requested asset — empty result set
- Malformed properties parameter returns 400 bad request
- Rate limit exceeded returns 402 payment required (x402 USDC on Base)
- Ethereum node connectivity issues may cause stale or unavailable data
- Insufficient x402 USDC balance returns payment error
Input
{
"asset": "ETH"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"asset": "ETH",
"chain": "ethereum",
"found": true,
"address": "0xBA12222222228d8Ba445958a75a0704d566BF2C8",
"fee_bps": 0,
"provider": "balancer-v2"
}Schema · Response
{
"type": "json",
"example": {
"asset": "WETH",
"chain": "ethereum",
"found": true,
"address": "0xBBBBBbbBBb9cC5e90e3b3Af64bdAF62C37EEFFCb",
"fee_bps": 0,
"provider": "morpho-blue"
}
}Tags
x402
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