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Plexa /v1/quote — On-Chain Swap Quote with Price Impact & Route
x402
Plexa /v1/quote — On-Chain Swap Quote with Price Impact & Route is a paid API for AI agents from api.getplexa.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Returns the realizable fill price, price impact (bps), depth, routing, and worst-case slippage for a token swap on Base, Polygon, or Arbitrum using canonical on-chain quoters.
Price / call$0.02
Success—
StatusUnknown
How this service works
Plexa /v1/quote — executable swap quote: the realizable fill price at your trade size, not a mid/spot price feed. Returns price impact (bps), worst-case slippage, depth and the per-leg route across Base/Polygon/Arbitrum liquidity, from canonical on-chain quoters. Call it before a swap to see what the fill actually costs. Informational data, not financial advice.
Output
Returns the actual executable fill price for the swap (not mid/spot), price impact in basis points, available liquidity depth, the per-leg DEX routing path, worst-case slippage estimate, and a confidence score. All derived from canonical on-chain quoters for the specified chain.
Example use cases
Pre-trade analysis for large swaps
“Before I execute a big trade, check the realizable fill price and slippage for swapping 50 MATIC to USDC on Polygon — I need to know if the price impact is acceptable.”
Compare execution quality across chains
“I want to swap ETH for USDT but I'm not sure which chain to use. Get me quotes on Base, Polygon, and Arbitrum so I can see which one gives me the best fill price and lowest slippage for a $10,000 trade.”
Assess liquidity depth for positioning
“How deep is the liquidity pool for trading WBTC to ETH on Arbitrum? I'm considering a large position and need to understand if there's enough depth to avoid excessive price impact.”
Technical details
Endpoint
POSThttps://api.getplexa.com/v1/quoteWhen to prefer
Use this endpoint when you need the actual realizable fill price for a swap — accounting for price impact, depth, and slippage — rather than a mid-price or spot feed. Ideal for pre-trade analysis, trade sizing decisions, or comparing execution quality across Base, Polygon, and Arbitrum before submitting a transaction.
Side effects
- Invalid or unsupported token address returns an error
- Both sizeIn and sizeUSD provided simultaneously causes a validation error
- Neither sizeIn nor sizeUSD provided causes a validation error
- Unsupported chain identifier returns an error
- Insufficient on-chain liquidity may result in low confidence or no quote
- Payment failure (x402) results in 402 status before quote is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Optional, default "base". One of: base | polygon | matic | arbitrum | arbitrum-one | arb | eip155:8453 | eip155:137 | eip155:42161 — case-sensitive (see `enum`). This is the chain the QUOTE is computed on; the networks you may PAY on (including Solana) are a separate list in `accepts[]`. |
| sizeIn | string | Trade size as a human amount of tokenIn, e.g. "1.5" for 1.5 WETH. A STRING, not a number. At least one of sizeIn / sizeUSD is required; if BOTH are sent, sizeUSD wins and sizeIn is ignored. |
| sizeUSD | string | Trade size as a USD notional, e.g. "5000". A STRING, not a number; positive, no thousands separator ("5,000" is rejected) and no exponent ("5e3" is rejected) — see `pattern`. At least one of sizeIn / sizeUSD is required; if BOTH are sent, sizeUSD wins. |
| tokenIn | string | ERC-20 being SOLD. 0x + 40 hex (see `pattern`) — a symbol like "USDC" is rejected with 400. |
| tokenOut | string | ERC-20 being BOUGHT. 0x + 40 hex (see `pattern`) — a symbol like "WETH" is rejected with 400. |
Tags
x402
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