{"openapi":"3.1.0","info":{"title":"Rigging Load API","version":"1.0.0","description":"Rigging and lifting load maths as an API, computed locally and deterministically. The wll endpoint relates the working load limit to the minimum breaking strength through the safety (design) factor: give a breaking strength and it returns the working load limit (WLL = MBS ÷ safety factor), or give a working load limit and it returns the minimum breaking strength your hardware must be rated for (MBS = WLL × safety factor). The safety factor can be given directly or looked up by component — general rigging and wire rope 5, chain sling 4, shackle 6, personnel/man-rated 10. The sling endpoint computes the tension in each leg of a multi-leg sling as the lifting angle changes: because the legs pull at an angle, each carries more than its share, with a load factor of 1/sin(angle to horizontal) — 1.0 vertical, 1.15 at 60°, 1.41 at 45° and 2.0 at 30° — and it accepts the angle from horizontal, from vertical or the included angle between legs. The safety endpoint lists the typical design factors. Loads are given in kilograms, pounds, tonnes, kilonewtons or newtons and reported in all of them. Everything is computed locally and deterministically, so it is instant and private. A planning aid, not a substitute for a qualified rigger or the governing standard (ASME B30, EN, local code). Ideal for crane and lifting apps, construction and warehouse tools, theatrical and entertainment rigging, and towing and recovery calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is rigging load maths; for the weight of the steel being lifted use a metal-weight API.","contact":{"name":"PremiumApi","url":"https://www.oanor.com/by/premiumapi"}},"servers":[{"url":"https://api.oanor.com/rigging-api","description":"oanor gateway"}],"tags":[{"name":"Rigging"},{"name":"Meta"}],"components":{"securitySchemes":{"oanorKey":{"type":"apiKey","in":"header","name":"x-oanor-key","description":"Get your key at https://www.oanor.com/developer/keys"}}},"security":[{"oanorKey":[]}],"paths":{"/v1/safety":{"get":{"operationId":"get_v1_safety","tags":["Rigging"],"summary":"Safety factor reference","description":"","parameters":[],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK","content":{"application/json":{"example":{"data":{"note":"Typical minimum design factors — indicative only. Always follow the governing standard (e.g. ASME B30, EN, local code) and the manufacturer's rating.","safety_factors":{"hook":5,"shackle":6,"man_rated":10,"personnel":10,"wire_rope":5,"crane_wire":3.5,"chain_sling":4,"general_rigging":5,"synthetic_sling":5,"wire_rope_sling":5,"overhead_lifting":5}},"meta":{"timestamp":"2026-06-04T01:59:07.988Z","request_id":"ace6246a-f01b-43a4-ae74-24fb504bcf65"},"status":"ok","message":"Safety factor reference","success":true}}}},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/sling":{"get":{"operationId":"get_v1_sling","tags":["Rigging"],"summary":"Sling leg tension by angle","description":"","parameters":[{"name":"load","in":"query","required":true,"description":"Load being lifted","schema":{"type":"string"},"example":"1000"},{"name":"legs","in":"query","required":false,"description":"Number of legs (default 2)","schema":{"type":"string"},"example":"2"},{"name":"angle","in":"query","required":false,"description":"Angle from horizontal (deg)","schema":{"type":"string"},"example":"60"},{"name":"angle_from_vertical","in":"query","required":false,"description":"Or angle from vertical","schema":{"type":"string"}},{"name":"included_angle","in":"query","required":false,"description":"Or included angle between legs","schema":{"type":"string"}},{"name":"unit","in":"query","required":false,"description":"kg|lb|t|kN|N","schema":{"type":"string"},"example":"kg"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK","content":{"application/json":{"example":{"data":{"legs":2,"load":{"kN":9.8067,"kg":1000,"lb":2204.62,"tonnes":1},"note":"Tension per leg = (load ÷ legs) × load factor, with load factor = 1/sin(angle to horizontal). Lower angles sharply increase leg tension (60°→1.15, 45°→1.41, 30°→2.0).","load_factor":1.1547,"tension_per_leg":{"kN":5.6619,"kg":577.35,"lb":1272.84,"tonnes":0.5774},"vertical_share_per_leg":{"kN":4.9033,"kg":500,"lb":1102.31,"tonnes":0.5},"angle_from_horizontal_deg":60},"meta":{"timestamp":"2026-06-04T01:59:08.085Z","request_id":"dfec31db-696a-4190-8c9c-c6d3c59ee83d"},"status":"ok","message":"Sling leg tension by angle","success":true}}}},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/wll":{"get":{"operationId":"get_v1_wll","tags":["Rigging"],"summary":"Working load limit ↔ breaking strength","description":"","parameters":[{"name":"breaking_strength","in":"query","required":false,"description":"MBS (to get WLL)","schema":{"type":"string"},"example":"10000"},{"name":"wll","in":"query","required":false,"description":"Or WLL (to get required MBS)","schema":{"type":"string"}},{"name":"safety_factor","in":"query","required":false,"description":"Design factor (default 5)","schema":{"type":"string"},"example":"5"},{"name":"component","in":"query","required":false,"description":"wire_rope|chain_sling|shackle|personnel|… (instead of factor)","schema":{"type":"string"}},{"name":"unit","in":"query","required":false,"description":"kg|lb|t|kN|N (default kg)","schema":{"type":"string"},"example":"kg"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK","content":{"application/json":{"example":{"data":{"mode":"mbs_to_wll","note":"WLL = MBS ÷ safety factor. 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