{"uid":"cap_8jTn639dDg6yOMKYjDxum","slug":"halowerk-europe-land-mean-surface-slope-parcel-polygon-33376625","name":"HALOWERK Europe Land – Mean Surface Slope (Parcel Polygon)","description":"Mean first-order surface gradient across the analysis grid. The service evaluates the bounded polygon supplied by the caller and returns standardized units across all 30 covered countries.","url":"https://euroland.halowerk.com/v1/europe-mean-slope-parcel","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"polygon":{"type":"array","items":{"type":"array","items":[{"type":"number","maximum":40.5,"minimum":-31.5},{"type":"number","maximum":72.5,"minimum":34}],"maxItems":2,"minItems":2,"additionalItems":false},"maxItems":100,"minItems":3,"description":"WGS84 polygon ring. The closing coordinate is optional; maximum span is 0.25 degrees."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.006","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","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":"$0.006/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_BU9XE-T-X-j00FWpgfVrb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the mean first-order surface slope gradient across a user-supplied WGS84 polygon parcel, returning standardized units for any of 30 European countries.","exampleAgentPrompt":"What is the mean slope gradient of this parcel in Bavaria — the polygon is roughly bounded by coordinates (11.2, 48.1), (11.25, 48.1), (11.25, 48.15), (11.2, 48.15)?","exampleUseCases":[{"title":"Farm parcel terrain suitability check","prompt":"I need to know the average slope of this agricultural plot in northern France — here are the corner coordinates: (2.31, 48.85), (2.32, 48.85), (2.32, 48.86), (2.31, 48.86). Is the terrain flat enough for mechanized farming?"},{"title":"Renewable energy site assessment","prompt":"Can you calculate the mean surface slope for this polygon in the Spanish interior — vertices at (-3.7, 40.4), (-3.68, 40.4), (-3.68, 40.42), (-3.7, 40.42)? We're evaluating it as a solar farm site."},{"title":"Erosion risk screening for a land parcel","prompt":"What's the average slope gradient across this parcel in the Carpathian foothills in Poland, defined by the polygon points (20.5, 49.6), (20.53, 49.6), (20.53, 49.62), (20.5, 49.62)? We're trying to assess erosion risk."}],"resultDescription":"A single standardized numeric value representing the mean first-order surface slope gradient across all pixels within the supplied polygon, expressed in consistent units applicable across all 30 covered European countries.","failureModes":["Polygon spans more than 0.25 degrees — request rejected with validation error","Fewer than 3 coordinate pairs provided — invalid polygon error","Coordinates fall outside the European coverage area (lat 34–72.5, lon -31.5–40.5) — out-of-coverage error","Polygon array items with incorrect coordinate ordering or extra items — schema validation failure","Payment not provided or insufficient — x402 payment required response"],"whenToPreferThis":"Choose this endpoint when you need a single aggregated slope metric for a custom polygon parcel anywhere across 30 European countries, especially for agricultural, environmental, or land development use cases. Prefer it over raster downloads when you want a ready-to-use scalar value without post-processing. If you need aspect/orientation (south-facing index) or land cover shares rather than raw slope, use the sibling endpoints on the same platform.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T13:01:20.524Z","isFirstParty":false}