{"uid":"cap_MypGbI2toIYkHq3WNvauE","slug":"halowerk-eastern-land-bulgaria-mean-surface-slope-d5573d17","name":"HALOWERK Eastern Land – Bulgaria Mean Surface Slope","description":"Mean first-order surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Bulgaria; results outside it are rejected before payment.","url":"https://ostland.halowerk.com/v1/bg-mean-slope","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"latitude":{"type":"number","maximum":72.5,"minimum":34,"description":"WGS84 latitude inside the published European coverage."},"longitude":{"type":"number","maximum":40.5,"minimum":-31.5,"description":"WGS84 longitude inside the published European coverage."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_u-fYYnt6rvFR8IDE4j4Bq","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the mean first-order surface gradient (slope) across the analysis grid for a given WGS84 coordinate within Bulgaria.","exampleAgentPrompt":"What's the mean surface slope at latitude 42.15, longitude 24.75 in Bulgaria? I need the average first-order terrain gradient for that point.","exampleUseCases":[{"title":"Agricultural site slope assessment","prompt":"Can you get me the mean terrain slope for a field I'm considering in Bulgaria at latitude 41.9, longitude 25.4? I need to know how steep the land is before deciding on irrigation planning."},{"title":"Construction feasibility terrain check","prompt":"I need to know the average surface gradient at lat 42.7, lon 23.3 in Bulgaria — we're evaluating a construction site and need to understand how sloped the terrain is there."},{"title":"Erosion risk analysis for Bulgarian land","prompt":"Can you pull the mean slope value for the location at latitude 43.1, longitude 27.9 in Bulgaria? We're doing an erosion vulnerability study and need the first-order surface gradient."}],"resultDescription":"A numeric value representing the mean first-order surface gradient (slope) across the analysis grid cell containing the specified coordinate. Coordinates outside the Bulgaria boundary are rejected before any payment is processed.","failureModes":["Coordinate outside Bulgaria boundary — request rejected with validation error before payment","Coordinate within European coverage range but outside Bulgaria polygon — rejected by Natural Earth boundary check","Latitude or longitude out of published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure","Missing required latitude or longitude fields — request rejected with input error","No data available for remote or sparse grid cells — may return null or error"],"whenToPreferThis":"Use this endpoint when you need the mean first-order terrain slope for a specific point in Bulgaria and want a validated, boundary-checked result. Prefer this over generic elevation APIs when you specifically need slope (gradient) rather than elevation, and when the target location is within Bulgaria. Use the max-slope sibling endpoint if you need peak adjacent-cell gradient rather than the mean.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:47:01.705Z","isFirstParty":false}