Roundhouse

PerpCheck by YourAITools

Hyperliquid pre-trade risk check API. Full pre-trade check of a Hyperliquid perp order: everything in lite (verdict, rule issues with fixes) plus the isolated liquidation price and distance, taker impact and average fill from the live L2 book for market orders, funding carry per day (who pays), mark/oracle premium, open interest and size vs 24 h volume. Read-only; never places or signs orders. Fail-closed. Not financial advice; the exchange decides whether an order is accepted.

TradingLiveeip155:8453Exactvia cdp
https://api.youraitools.co/perpcheck/v1/full
HyperliquidPerpsPre-tradeTradingRisk
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$256.05
Verified settled volume
226 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-25 00:59Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.youraitools.co/perpcheck/v1/full",
      "description": "Full pre-trade check of a Hyperliquid perp order: everything in lite (verdict, rule issues with fixes) plus the isolated liquidation price and distance, taker impact and average fill from the live L2 book for market orders, funding carry per day (who pays), mark/oracle premium, open interest and size vs 24 h volume. Read-only; never places or signs orders. Fail-closed. Not financial advice; the exchange decides whether an order is accepted.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "coin": {
              "type": "string",
              "required": true,
              "description": "Hyperliquid main-dex perp name, e.g. BTC, ETH, SOL, HYPE, kPEPE"
            },
            "side": {
              "type": "string",
              "required": true,
              "description": "long/buy or short/sell"
            },
            "size": {
              "type": "string",
              "required": false,
              "description": "Order size in coins, exactly as you would send it (decimals are checked), e.g. 0.001. Give size or notional."
            },
            "price": {
              "type": "string",
              "required": false,
              "description": "Limit price exactly as you would send it (tick rule is checked). Omit for a market order (then taker impact is estimated from the L2 book)."
            },
            "margin": {
              "type": "string",
              "required": false,
              "description": "cross (default) or isolated"
            },
            "leverage": {
              "type": "number",
              "required": false,
              "description": "Leverage, e.g. 10 (default 1)"
            },
            "notional": {
              "type": "number",
              "required": false,
              "description": "Order value in USD (instead of size), e.g. 100"
            },
            "reduceOnly": {
              "type": "boolean",
              "required": false,
              "description": "true if the order only reduces a position (exempt from the minimum and OI cap)"
            }
          },
          "discoverable": true
        },
        "output": {
          "coin": "BTC",
          "side": "long",
          "size": 0.001,
          "tier": "full",
          "rules": {
            "szDecimals": 5,
            "max_leverage": 40,
            "only_isolated": false,
            "min_notional_usd": 10,
            "price_max_decimals": 1,
            "price_max_sig_figs": 5,
            "max_leverage_at_size": 40
          },
          "issues": [],
          "margin": "cross",
          "market": {
            "mark": 81274,
            "oracle": 81279.6,
            "premium_bps": -0.69,
            "day_volume_usd": 1978449099,
            "open_interest_usd": 3634646602,
            "size_vs_day_volume_pct": 0
          },
          "funding": {
            "apr_pct": 10.95,
            "direction": "you pay",
            "hourly_rate": 0.0000125,
            "est_cost_per_day_usd": 0.0244
          },
          "verdict": "OK",
          "leverage": 10,
          "warnings": [],
          "execution": {
            "mid": 81274.5,
            "book_time": 1792783206472,
            "spread_bps": 0.12,
            "est_avg_fill": 81275,
            "est_impact_bps": 0.06,
            "book_depth_covered": 1
          },
          "checked_at": "2026-10-23T19:20:07.089Z",
          "confidence": "high",
          "disclaimer": "Not financial advice; the exchange decides whether an order is accepted. PerpCheck is a read-only pre-trade check: it never places, signs or holds orders, has no custody and never asks for keys.",
          "order_type": "market",
          "liquidation": {
            "note": "cross margin: the real liquidation price depends on your whole account; this is the isolated-equivalent worst case",
            "distance_pct": 8.86,
            "estimate_isolated": 74072.5
          },
          "reduce_only": false,
          "notional_usd": 81.27,
          "sources_failed": []
        }
      },
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 120
    }
  ],
  "message": "Payment required: PerpCheck GET /perpcheck/v1/full costs $0.01 per call in USDC. Will this Hyperliquid perp order be rejected, and what does it cost and risk? Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum, Solana. No account, no API key. No crypto wallet? Buy prepaid credits by card or USDC at https://api.youraitools.co/credits/ and send them as a Bearer key. Free: 30 calls/day (full checks via remote MCP, tool check_perp_order), then $0.003 lite / $0.01 full per call in USDC (not financial advice)",
  "x402Version": 1,
  "payment_help": {
    "docs": "https://api.youraitools.co/perpcheck/",
    "tool": "PerpCheck",
    "what": "Will this Hyperliquid perp order be rejected, and what does it cost and risk? A read-only pre-trade check of the order a trading agent is about to send: REJECT_LIKELY / CAUTION / OK with each exchange-rule issue and a fix value (size decimals, price tick, $10 minimum, max leverage by margin tier, isolated-only, open-interest cap, delisted, far-from-mark), plus isolated liquidation estimate, taker impact from the live L2 book and funding carry (full). Never places, signs or holds orders. Fail-closed: a failed source is never OK. Not financial advice; the exchange decides whether an order is accepted.",
    "price": "$0.01 per call (USDC)",
    "route": "GET https://api.youraitools.co/perpcheck/v1/full",
    "mcp_hub": "https://api.youraitools.co/mcp/hub",
    "free_tier": "30 calls/day (full checks via remote MCP, tool check_perp_order), then $0.003 lite / $0.01 full per call in USDC (not financial advice)",
    "pay_with_x402": "Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum, Solana. No account, no API key.",
    "pay_with_credits": {
      "url": "https://api.youraitools.co/credits/",
      "use": "Send the key as Authorization: Bearer yatc_... on the same request; each call is deducted at the listed price.",
      "card": "Pay by card (Stripe): $5, $20 or $50 credit packs, no crypto wallet needed.",
      "wallet": "Or buy $1 or $5 of credits in USDC with the one-click browser wallet button on the same page.",
      "card_checkout": "https://api.youraitools.co/credits/ (choose a pack under Pay by card; Stripe checkout opens in one click)"
    }
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x3c1A…08d6F. The signed payment is good for 2 minutes.

Paid to
0x3c1A…08d6F
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
10000 smallest units
10000units
on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0x3c1A…08d6F
Token contract
0x3c49…c3359
Payment window
2 minutes
10000units
on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0x3c1A…08d6F
Token contract
0xaf88…e5831
Payment window
2 minutes
10000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
FH73Wb…L2Jte
Token contract
EPjFWd…TDt1v
Payment window
2 minutes
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:42161",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
    },
    "payTo": "FH73WbbUe2UyNzfy72MJs5nT3NxyDf9GrqE7kzjL2Jte",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "coin": "BTC",
          "side": "long",
          "size": "0.001",
          "leverage": 10
        }
      },
      "output": {
        "type": "json",
        "example": {
          "coin": "BTC",
          "side": "long",
          "size": 0.001,
          "tier": "full",
          "rules": {
            "szDecimals": 5,
            "max_leverage": 40,
            "only_isolated": false,
            "min_notional_usd": 10,
            "price_max_decimals": 1,
            "price_max_sig_figs": 5,
            "max_leverage_at_size": 40
          },
          "issues": [],
          "margin": "cross",
          "market": {
            "mark": 81274,
            "oracle": 81279.6,
            "premium_bps": -0.69,
            "day_volume_usd": 1978449099,
            "open_interest_usd": 3634646602,
            "size_vs_day_volume_pct": 0
          },
          "funding": {
            "apr_pct": 10.95,
            "direction": "you pay",
            "hourly_rate": 0.0000125,
            "est_cost_per_day_usd": 0.0244
          },
          "verdict": "OK",
          "leverage": 10,
          "warnings": [],
          "execution": {
            "mid": 81274.5,
            "book_time": 1792783206472,
            "spread_bps": 0.12,
            "est_avg_fill": 81275,
            "est_impact_bps": 0.06,
            "book_depth_covered": 1
          },
          "checked_at": "2026-10-23T19:20:07.089Z",
          "confidence": "high",
          "disclaimer": "Not financial advice; the exchange decides whether an order is accepted. PerpCheck is a read-only pre-trade check: it never places, signs or holds orders, has no custody and never asks for keys.",
          "order_type": "market",
          "liquidation": {
            "note": "cross margin: the real liquidation price depends on your whole account; this is the isolated-equivalent worst case",
            "distance_pct": 8.86,
            "estimate_isolated": 74072.5
          },
          "reduce_only": false,
          "notional_usd": 81.27,
          "sources_failed": []
        }
      }
    },
    "schema": {
      "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": [
                "coin",
                "side"
              ],
              "properties": {
                "coin": {
                  "type": "string",
                  "description": "Hyperliquid main-dex perp name, e.g. BTC, ETH, SOL, HYPE, kPEPE"
                },
                "side": {
                  "enum": [
                    "long",
                    "short",
                    "buy",
                    "sell"
                  ],
                  "type": "string",
                  "description": "long/buy or short/sell"
                },
                "size": {
                  "type": "string",
                  "description": "Order size in coins, exactly as you would send it (decimals are checked), e.g. 0.001. Give size or notional."
                },
                "price": {
                  "type": "string",
                  "description": "Limit price exactly as you would send it (tick rule is checked). Omit for a market order (then taker impact is estimated from the L2 book)."
                },
                "margin": {
                  "enum": [
                    "cross",
                    "isolated"
                  ],
                  "type": "string",
                  "description": "cross (default) or isolated"
                },
                "leverage": {
                  "type": "number",
                  "description": "Leverage, e.g. 10 (default 1)"
                },
                "notional": {
                  "type": "number",
                  "description": "Order value in USD (instead of size), e.g. 100"
                },
                "reduceOnly": {
                  "type": "boolean",
                  "description": "true if the order only reduces a position (exempt from the minimum and OI cap)"
                }
              },
              "description": "Search intents: liquidation price calculator, slippage estimate, hyperliquid pre trade, funding cost, perp order risk, market impact"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "coin": {
                  "type": "string"
                },
                "side": {
                  "type": "string"
                },
                "size": {
                  "type": "number"
                },
                "tier": {
                  "type": "string"
                },
                "rules": {
                  "type": "object"
                },
                "issues": {
                  "type": "array"
                },
                "margin": {
                  "type": "string"
                },
                "market": {
                  "type": "object"
                },
                "funding": {
                  "type": "object"
                },
                "verdict": {
                  "type": "string"
                },
                "leverage": {
                  "type": "number"
                },
                "warnings": {
                  "type": "array"
                },
                "execution": {
                  "type": "object"
                },
                "checked_at": {
                  "type": "string"
                },
                "confidence": {
                  "type": "string"
                },
                "disclaimer": {
                  "type": "string"
                },
                "order_type": {
                  "type": "string"
                },
                "liquidation": {
                  "type": "object"
                },
                "reduce_only": {
                  "type": "boolean"
                },
                "notional_usd": {
                  "type": "number"
                },
                "sources_failed": {
                  "type": "array"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-25 00:59Z
Last indexed by Roundhouse
2026-10-26 20:00Z
Last enriched (probe, favicon, geo)
2026-10-24 23:16Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service PerpCheck by YourAITools and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=PerpCheck%20by%20YourAITools'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://api.youraitools.co/perpcheck/v1/full, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.