{"api":"v1","generated_at":"2026-10-02T06:29:27.498Z","licence":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/","attribution":"TOLL, with a link to the page cited"},"page":"https://tollindex.com/e/api-magentlab-com-api-calc-ckid-u25-87f6ed","pinned_page":"https://tollindex.com/e/api-magentlab-com-api-calc-ckid-u25-87f6ed/at/2026-10-02T05-34Z","pinned":false,"method":"https://tollindex.com/ledger/method","snapshot_at":"2026-10-02T05:34:29.993Z","snapshot_stamp":"2026-10-02T05-34Z","endpoint":{"slug":"api-magentlab-com-api-calc-ckid-u25-87f6ed","canonical_url":"https://api.magentlab.com/api/calc/ckid_u25","resource":"https://api.magentlab.com/api/calc/ckid_u25","http_method":"POST","type":"http","x402_version":2,"registries":["cdp"],"primary_registry":"cdp","curated_by_coinbase":false,"description":"CKiD U25 eGFR (Pierce 2021) for ages 1-25: age- and sex-dependent K times height in meters over creatinine (mg/dL), or K over cystatin C (mg/L), or the average of both when both markers are given. Height may be cm or inches; creatinine may be mg/dL or µmol/L. Not the Schwartz 2009 bedside 0.413 formula, not a drug dose, and not a CKD stage. Not a medical device.","service_name":"magent","declared_category":null,"declared_tags":["ckid-u25","pediatric","kidney","egfr","calculator"],"route_template":null,"registry_updated":"2026-09-28T13:55:35.898Z"},"derived":{"note":"fields no registry supplies; TOLL derives them and marks them derived on the page","title":"calc ckid u25","category":"other","first_observed_by_toll":"2026-09-28T13:51:25.436Z","last_observed_by_toll":"2026-10-02T05:34:29.993Z","observation_began":"2026-09-10"},"presence":{"listed_now":true,"first_absent_at":null,"delisting_confirmed_at":null,"events":[{"registry":"cdp","at":"2026-09-28T13:51:25.437Z","event":"listed"}]},"accepts":[{"registry":"cdp","ordinal":0,"network":"eip155:8453","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","asset_name":"USD Coin","symbol":"USDC","decimals":6,"amount_display":"0.005 USDC","amount_units":0.005,"decimals_known":true,"pay_to":"0x836Be278f1739fB4308091cD1852F7971Bc19Ee2","scheme":"exact"}],"counters":{"observed_at":"2026-10-02T05:34:29.993Z","calls_30d":1,"unique_payers_30d":1,"last_called_at":"2026-09-28T13:55:35.776Z"},"validation":{"latest":{"observed_at":"2026-10-01T08:21:35.197Z","state":"pass","failed_checks":[],"endpoint_http_status":402,"run_id":"daily-2026-10-01"},"uptime":[{"days":7,"observed":5,"passed":5,"ratio":1},{"days":30,"observed":5,"passed":5,"ratio":1},{"days":90,"observed":5,"passed":5,"ratio":1}],"history_90d":[{"observed_at":"2026-10-01T08:21:35.197Z","state":"pass","failed_checks":[],"run_id":"daily-2026-10-01","state_changed":false},{"observed_at":"2026-09-30T07:43:34.399Z","state":"pass","failed_checks":[],"run_id":"daily-2026-09-30","state_changed":false},{"observed_at":"2026-09-29T19:56:57.446Z","state":"pass","failed_checks":[],"run_id":"daily-2026-09-29","state_changed":false},{"observed_at":"2026-09-28T17:00:59.638Z","state":"pass","failed_checks":[],"run_id":"daily-2026-09-28","state_changed":false},{"observed_at":"2026-09-28T16:44:58.787Z","state":"pass","failed_checks":[],"run_id":"new-after-daily-2026-09-28","state_changed":true}]},"seller":{"wallet":"0x836Be278f1739fB4308091cD1852F7971Bc19Ee2","page":"https://tollindex.com/seller/0x836Be278f1739fB4308091cD1852F7971Bc19Ee2","endpoints":844,"hosts":1},"reports":0,"registry_record":{"cdp":[{"tags":["ckid-u25","pediatric","kidney","egfr","calculator"],"type":"http","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2","paymentFlow":"upfront","resourceUrl":"https://api.magentlab.com/api/calc/ckid_u25","assetTransferMethod":"eip3009"},"payTo":"0x836Be278f1739fB4308091cD1852F7971Bc19Ee2","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":600}],"quality":{"lastCalledAt":"2026-09-28T13:55:35.776Z","l30DaysTotalCalls":1,"l30DaysUniquePayers":1},"resource":"https://api.magentlab.com/api/calc/ckid_u25","extensions":{"bazaar":{"info":{"input":{"body":{"items":[{"sex":"male","age_years":10,"height_cm":140,"height_in":55.1181,"cystatin_c_mg_l":1,"creatinine_mg_dl":1,"creatinine_umol_l":88.42},{"sex":"male","age_years":10,"height_cm":140,"height_in":55.1181,"cystatin_c_mg_l":1,"creatinine_mg_dl":1,"creatinine_umol_l":88.42}]},"type":"http","method":"POST"},"output":{"type":"json","example":{"path":"/api/calc/ckid_u25","count":2,"items":[{"sex":"male","k_cr":38.3834,"units":"mL/min/1.73m2","formula":"ckid_u25_cr","citation":{"id":"pierce-2021-ckid-u25","doi":"10.1016/j.kint.2020.10.047","pmid":"33301749","title":"Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease","source":"Kidney Int. 2021;99(4):948-956","authors":"Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ"},"age_years":10,"height_cm":140,"disclaimer":"Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.","creatinine_mg_dl":1,"egfr_ml_min_1_73m2":53.7,"formula_expression":"egfr_cr = K_cr * (height_m / creatinine_mg_dl); egfr_cys = K_cys * (1 / cystatin_c_mg_l); combined = (egfr_cr + egfr_cys) / 2 when both markers; K_cr and K_cys are Pierce 2021 Table 2 age-dependent (not constant-K models); height in meters; ages 1-25"},{"sex":"male","k_cr":38.3834,"units":"mL/min/1.73m2","formula":"ckid_u25_cr","citation":{"id":"pierce-2021-ckid-u25","doi":"10.1016/j.kint.2020.10.047","pmid":"33301749","title":"Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease","source":"Kidney Int. 2021;99(4):948-956","authors":"Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ"},"age_years":10,"height_cm":140,"disclaimer":"Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.","creatinine_mg_dl":1,"egfr_ml_min_1_73m2":53.7,"formula_expression":"egfr_cr = K_cr * (height_m / creatinine_mg_dl); egfr_cys = K_cys * (1 / cystatin_c_mg_l); combined = (egfr_cr + egfr_cys) / 2 when both markers; K_cr and K_cys are Pierce 2021 Table 2 age-dependent (not constant-K models); height in meters; ages 1-25"}]}},"iconUrl":"https://api.magentlab.com/favicon.ico"},"schema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"body":{"type":"object","required":["items"],"properties":{"items":{"type":"array","items":{"type":"object","required":["age_years","sex"],"properties":{"sex":{"enum":["female","male"],"type":"string","description":"Sex used by Pierce 2021 Table 2 K. female or male."},"age_years":{"type":"number","description":"Age in years (1-25, fractional ages allowed). Pierce 2021 CKiD U25 age-dependent K is evaluated at that age. Not the adult 18-120 clamp."},"height_cm":{"type":"number","description":"Height in centimeters (50-250). Required with creatinine for the creatinine or combined path. Converted to meters in the equation. Provide height_cm or height_in. Not required for cystatin-only."},"height_in":{"type":"number","description":"Height in inches (20-98). Converted as cm = in * 2.54."},"cystatin_c_mg_l":{"type":"number","description":"Serum cystatin C in mg/L (0.2-10). Required for the cystatin-only or combined path. Height is not required when this is the only marker."},"creatinine_mg_dl":{"type":"number","description":"Serum creatinine in mg/dL (0.1-20). Required with height for the creatinine or combined path. Provide this or creatinine_umol_l."},"creatinine_umol_l":{"type":"number","description":"Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42."}}},"maxItems":25,"minItems":1}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"type":"string","const":"POST"},"headers":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}}}},"description":"CKiD U25 eGFR (Pierce 2021) for ages 1-25: age- and sex-dependent K times height in meters over creatinine (mg/dL), or K over cystatin C (mg/L), or the average of both when both markers are given. Height may be cm or inches; creatinine may be mg/dL or µmol/L. Not the Schwartz 2009 bedside 0.413 formula, not a drug dose, and not a CKD stage. Not a medical device.","lastUpdated":"2026-09-28T13:55:35.898Z","serviceName":"magent","x402Version":2}]}}