{"uid":"cap_vSWBIJkXl0oz4EigNTUNL","slug":"uniswap-v3-price-impact-slippage-estimator-5e338fb6","name":"Uniswap V3 Price Impact / Slippage Estimator","description":"Estimate the price impact (slippage) of a swap of a given size by comparing Uniswap V3 quotes at minimal vs target size - tells trading agents how much a large order will move the price against them before they execute, on-chain data LLMs cannot compute. price impact, slippage estimate, swap slippage, large trade impact, market depth, liquidity check Accepts payment on Base or Solana — either network works.","url":"https://api.x402node.dev/defi/price-impact","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["tokenIn","tokenOut"],"properties":{"chain":{"type":"string","description":"base (default), ethereum, arbitrum, optimism, polygon"},"amount":{"type":"string","description":"Trade size in tokenIn units (default 1000)"},"tokenIn":{"type":"string","description":"Input token (required)"},"tokenOut":{"type":"string","description":"Output token (required)"}}}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_LvciDd2IikEyPqdcQnLRt","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Estimates the price impact (slippage) of a token swap by comparing Uniswap V3 quotes at minimal vs. target trade size, revealing how much a large order will move the market before execution.","exampleAgentPrompt":"Before I execute, tell me the price impact of swapping 200,000 USDC for WETH on Uniswap V3 — I want to know how much slippage I should expect on an order that size.","exampleUseCases":null,"resultDescription":"Returns the estimated price impact percentage for the specified swap by comparing the Uniswap V3 quote at a minimal (baseline) size against the quote at the full target trade size, effectively quantifying how much the large order moves the price against the trader.","failureModes":["Token pair has no Uniswap V3 pool — returns error or zero liquidity","Invalid token address format — returns 400 bad request","Pool exists but is extremely illiquid — very high price impact returned or timeout","RPC node unavailable — upstream on-chain call failure","Trade size too small to differentiate from minimal quote — near-zero impact returned trivially"],"whenToPreferThis":"Use this endpoint when an AI trading agent needs to assess execution risk for a large DeFi swap before submitting the transaction — particularly when trading less-liquid tokens or large notional amounts on Uniswap V3. Prefer this over generic liquidity checks when you need a quantified slippage estimate rather than a qualitative depth indicator.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:50:58.650Z","isFirstParty":false}