Overview Quickstart API Calculators MCP Pricing Changelog

Calculator API

Illustrative fund math, no auth required

Seven stateless POST endpoints — the same deterministic engines behind the free tools at /tools.

Fund Health Check

POST/api/v1/calc/fund-health-checkPermalink →Try the free tool →

A free, 60-second operational health score for your crypto fund.

Name	Type	Required	Description
aumUsd	number	Optional	—
positionsCsv	string	Optional	—
mgmtFeePct	number	Optional	—
perfFeePct	number	Optional	—
hasHwm	boolean	Optional	—
hurdlePct	unknown	Optional	—
navFrequency	"daily" \| "weekly" \| "monthly" \| "quarterly"	Optional	—
reconFrequency	"daily" \| "weekly" \| "monthly" \| "rarely"	Optional	—
lpReportingFrequency	"monthly" \| "quarterly" \| "adhoc"	Optional	—
backOfficeHeadcount	number	Optional	—
hasFundAdmin	boolean	Optional	—
hasAnnualAudit	boolean	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/fund-health-check" \
  -H "Content-Type: application/json" \
  -d '{"aumUsd":25000000,"positionsCsv":"","mgmtFeePct":2,"perfFeePct":20,"hasHwm":true,"hurdlePct":null,"navFrequency":"monthly","reconFrequency":"monthly","lpReportingFrequency":"quarterly","backOfficeHeadcount":1,"hasFundAdmin":true,"hasAnnualAudit":false}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/fund-health-check", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "aumUsd": 25000000,
  "positionsCsv": "",
  "mgmtFeePct": 2,
  "perfFeePct": 20,
  "hasHwm": true,
  "hurdlePct": null,
  "navFrequency": "monthly",
  "reconFrequency": "monthly",
  "lpReportingFrequency": "quarterly",
  "backOfficeHeadcount": 1,
  "hasFundAdmin": true,
  "hasAnnualAudit": false
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/fund-health-check
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/fund-health-check",
    json={"aumUsd": 25000000, "positionsCsv": "", "mgmtFeePct": 2, "perfFeePct": 20, "hasHwm": True, "hurdlePct": None, "navFrequency": "monthly", "reconFrequency": "monthly", "lpReportingFrequency": "quarterly", "backOfficeHeadcount": 1, "hasFundAdmin": True, "hasAnnualAudit": False},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(12)

"aumUsd": 25000000

"positionsCsv": ""

"mgmtFeePct": 2

"perfFeePct": 20

"hasHwm": true

"hurdlePct": null

"navFrequency": "monthly"

"reconFrequency": "monthly"

"lpReportingFrequency": "quarterly"

"backOfficeHeadcount": 1

"hasFundAdmin": true

"hasAnnualAudit": false

Exposure Analysis

POST/api/v1/calc/exposure-analysisPermalink →Try the free tool →

Paste your positions, see gross, net, and concentration exposure instantly.

Name	Type	Required	Description
positionsCsv	string	Optional	—
navUsd	unknown	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/exposure-analysis" \
  -H "Content-Type: application/json" \
  -d '{"positionsCsv":"Asset,Value,Venue,Class\nBTC,450000,Coinbase,crypto\nETH,280000,Coinbase,crypto\nSOL,95000,Binance,crypto\nAVAX,60000,Binance,crypto\nLINK,40000,Kraken,crypto\nMATIC,-55000,Binance,crypto\nUSDC,180000,Coinbase,stablecoin\nUSDT,45000,Kraken,stablecoin","navUsd":null}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/exposure-analysis", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "positionsCsv": "Asset,Value,Venue,Class\nBTC,450000,Coinbase,crypto\nETH,280000,Coinbase,crypto\nSOL,95000,Binance,crypto\nAVAX,60000,Binance,crypto\nLINK,40000,Kraken,crypto\nMATIC,-55000,Binance,crypto\nUSDC,180000,Coinbase,stablecoin\nUSDT,45000,Kraken,stablecoin",
  "navUsd": null
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/exposure-analysis
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/exposure-analysis",
    json={"positionsCsv": "Asset,Value,Venue,Class\nBTC,450000,Coinbase,crypto\nETH,280000,Coinbase,crypto\nSOL,95000,Binance,crypto\nAVAX,60000,Binance,crypto\nLINK,40000,Kraken,crypto\nMATIC,-55000,Binance,crypto\nUSDC,180000,Coinbase,stablecoin\nUSDT,45000,Kraken,stablecoin", "navUsd": None},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(2)

"positionsCsv": "Asset,Value,Venue,Class BTC,450000,Coinbase,crypto ETH,280000,Coinbase,crypto SOL,95000,Binance,crypto AVAX,60000,Binance,crypto LINK,40000,Kraken,crypto MATIC,-55000,Binance,crypto USDC,180000,Coinbase,stablecoin USDT,45000,Kraken,stablecoin"

"navUsd": null

NAV Validator

POST/api/v1/calc/nav-validatorPermalink →Try the free tool →

Check your month-end NAV roll-forward for arithmetic and fee errors in seconds.

Name	Type	Required	Description
periodStart	string	Optional	—
periodEnd	string	Optional	—
openingNavUsd	number	Optional	—
contributionsUsd	number	Optional	—
withdrawalsUsd	number	Optional	—
grossPnlUsd	number	Optional	—
mgmtFeeUsd	number	Optional	—
perfFeeUsd	number	Optional	—
otherExpensesUsd	number	Optional	—
reportedClosingNavUsd	number	Optional	—
mgmtFeePct	number	Optional	—
perfFeePct	number	Optional	—
hasHwm	boolean	Optional	—
lpRowsCsv	string	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/nav-validator" \
  -H "Content-Type: application/json" \
  -d '{"periodStart":"2026-06-01","periodEnd":"2026-06-30","openingNavUsd":25000000,"contributionsUsd":500000,"withdrawalsUsd":0,"grossPnlUsd":750000,"mgmtFeeUsd":41667,"perfFeeUsd":141667,"otherExpensesUsd":10000,"reportedClosingNavUsd":26056666,"mgmtFeePct":2,"perfFeePct":20,"hasHwm":true,"lpRowsCsv":""}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/nav-validator", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "periodStart": "2026-06-01",
  "periodEnd": "2026-06-30",
  "openingNavUsd": 25000000,
  "contributionsUsd": 500000,
  "withdrawalsUsd": 0,
  "grossPnlUsd": 750000,
  "mgmtFeeUsd": 41667,
  "perfFeeUsd": 141667,
  "otherExpensesUsd": 10000,
  "reportedClosingNavUsd": 26056666,
  "mgmtFeePct": 2,
  "perfFeePct": 20,
  "hasHwm": true,
  "lpRowsCsv": ""
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/nav-validator
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/nav-validator",
    json={"periodStart": "2026-06-01", "periodEnd": "2026-06-30", "openingNavUsd": 25000000, "contributionsUsd": 500000, "withdrawalsUsd": 0, "grossPnlUsd": 750000, "mgmtFeeUsd": 41667, "perfFeeUsd": 141667, "otherExpensesUsd": 10000, "reportedClosingNavUsd": 26056666, "mgmtFeePct": 2, "perfFeePct": 20, "hasHwm": True, "lpRowsCsv": ""},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(14)

"periodStart": "2026-06-01"

"periodEnd": "2026-06-30"

"openingNavUsd": 25000000

"contributionsUsd": 500000

"withdrawalsUsd": 0

"grossPnlUsd": 750000

"mgmtFeeUsd": 41667

"perfFeeUsd": 141667

"otherExpensesUsd": 10000

"reportedClosingNavUsd": 26056666

"mgmtFeePct": 2

"perfFeePct": 20

"hasHwm": true

"lpRowsCsv": ""

Hedge Fund Fee Calculator

POST/api/v1/calc/fee-calculatorPermalink →Try the free tool →

See exactly what a 2/20 (or any) fee structure costs an LP over time.

Name	Type	Required	Description
startingNavUsd	number	Optional	—
annualGrossReturnPct	number	Optional	—
mgmtFeePct	number	Optional	—
perfFeePct	number	Optional	—
hurdlePct	number \| null	Optional	—
hasHwm	boolean	Optional	—
crystallization	"annual" \| "quarterly"	Optional	—
horizonYears	number	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/fee-calculator" \
  -H "Content-Type: application/json" \
  -d '{"startingNavUsd":25000000,"annualGrossReturnPct":15,"mgmtFeePct":2,"perfFeePct":20,"hurdlePct":null,"hasHwm":true,"crystallization":"annual","horizonYears":5}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/fee-calculator", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "startingNavUsd": 25000000,
  "annualGrossReturnPct": 15,
  "mgmtFeePct": 2,
  "perfFeePct": 20,
  "hurdlePct": null,
  "hasHwm": true,
  "crystallization": "annual",
  "horizonYears": 5
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/fee-calculator
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/fee-calculator",
    json={"startingNavUsd": 25000000, "annualGrossReturnPct": 15, "mgmtFeePct": 2, "perfFeePct": 20, "hurdlePct": None, "hasHwm": True, "crystallization": "annual", "horizonYears": 5},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(8)

"startingNavUsd": 25000000

"annualGrossReturnPct": 15

"mgmtFeePct": 2

"perfFeePct": 20

"hurdlePct": null

"hasHwm": true

"crystallization": "annual"

"horizonYears": 5

Fund Operating Cost Calculator

POST/api/v1/calc/operating-cost-calculatorPermalink →Try the free tool →

Add up what your fund's back office actually costs every year.

Name	Type	Required	Description
financeHireUsd	number	Optional	—
fundAdminUsd	number	Optional	—
complianceUsd	number	Optional	—
riskDeskUsd	number	Optional	—
lpReportsPerYear	number	Optional	—
costPerReportUsd	number	Optional	—
auditUsd	number	Optional	—
legalUsd	number	Optional	—
softwareUsd	number	Optional	—
aumUsd	number	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/operating-cost-calculator" \
  -H "Content-Type: application/json" \
  -d '{"financeHireUsd":120000,"fundAdminUsd":100000,"complianceUsd":80000,"riskDeskUsd":40000,"lpReportsPerYear":12,"costPerReportUsd":8000,"auditUsd":0,"legalUsd":0,"softwareUsd":0,"aumUsd":25000000}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/operating-cost-calculator", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "financeHireUsd": 120000,
  "fundAdminUsd": 100000,
  "complianceUsd": 80000,
  "riskDeskUsd": 40000,
  "lpReportsPerYear": 12,
  "costPerReportUsd": 8000,
  "auditUsd": 0,
  "legalUsd": 0,
  "softwareUsd": 0,
  "aumUsd": 25000000
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/operating-cost-calculator
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/operating-cost-calculator",
    json={"financeHireUsd": 120000, "fundAdminUsd": 100000, "complianceUsd": 80000, "riskDeskUsd": 40000, "lpReportsPerYear": 12, "costPerReportUsd": 8000, "auditUsd": 0, "legalUsd": 0, "softwareUsd": 0, "aumUsd": 25000000},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(10)

"financeHireUsd": 120000

"fundAdminUsd": 100000

"complianceUsd": 80000

"riskDeskUsd": 40000

"lpReportsPerYear": 12

"costPerReportUsd": 8000

"auditUsd": 0

"legalUsd": 0

"softwareUsd": 0

"aumUsd": 25000000

Back-Office Savings Calculator

POST/api/v1/calc/back-office-savingsPermalink →Try the free tool →

See what part of your back-office spend is realistically automatable.

Name	Type	Required	Description
financeHireUsd	number	Optional	—
fundAdminUsd	number	Optional	—
complianceUsd	number	Optional	—
riskDeskUsd	number	Optional	—
lpReportsPerYear	number	Optional	—
costPerReportUsd	number	Optional	—
auditUsd	number	Optional	—
legalUsd	number	Optional	—
softwareUsd	number	Optional	—
aumUsd	number	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/back-office-savings" \
  -H "Content-Type: application/json" \
  -d '{"financeHireUsd":120000,"fundAdminUsd":100000,"complianceUsd":80000,"riskDeskUsd":40000,"lpReportsPerYear":12,"costPerReportUsd":8000,"auditUsd":0,"legalUsd":0,"softwareUsd":0,"aumUsd":25000000}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/back-office-savings", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "financeHireUsd": 120000,
  "fundAdminUsd": 100000,
  "complianceUsd": 80000,
  "riskDeskUsd": 40000,
  "lpReportsPerYear": 12,
  "costPerReportUsd": 8000,
  "auditUsd": 0,
  "legalUsd": 0,
  "softwareUsd": 0,
  "aumUsd": 25000000
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/back-office-savings
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/back-office-savings",
    json={"financeHireUsd": 120000, "fundAdminUsd": 100000, "complianceUsd": 80000, "riskDeskUsd": 40000, "lpReportsPerYear": 12, "costPerReportUsd": 8000, "auditUsd": 0, "legalUsd": 0, "softwareUsd": 0, "aumUsd": 25000000},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(10)

"financeHireUsd": 120000

"fundAdminUsd": 100000

"complianceUsd": 80000

"riskDeskUsd": 40000

"lpReportsPerYear": 12

"costPerReportUsd": 8000

"auditUsd": 0

"legalUsd": 0

"softwareUsd": 0

"aumUsd": 25000000

LP Report Grader

POST/api/v1/calc/lp-report-graderPermalink →Try the free tool →

Grade your monthly LP update against what institutional investors expect.

Name	Type	Required	Description
reportText	string	Optional	—
reportingFrequency	"monthly" \| "quarterly" \| "adhoc"	Optional	—

cURL

curl -s -X POST "https://nyxchain.org/api/v1/calc/lp-report-grader" \
  -H "Content-Type: application/json" \
  -d '{"reportText":"","reportingFrequency":"monthly"}'

JavaScript

const res = await fetch("https://nyxchain.org/api/v1/calc/lp-report-grader", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
  "reportText": "",
  "reportingFrequency": "monthly"
}),
})
const data = await res.json()

Python

# POST https://nyxchain.org/api/v1/calc/lp-report-grader
import requests

res = requests.post(
    "https://nyxchain.org/api/v1/calc/lp-report-grader",
    json={"reportText": "", "reportingFrequency": "monthly"},
)
data = res.json()

Try It

Request body (JSON)

Sample response

Object(2)

"reportText": ""

"reportingFrequency": "monthly"

FAQ

Questions, answered

Is there an API to calculate hedge fund fees?

Yes. POST /api/v1/calc/fee-calculator computes management and performance fees — including high-water mark and hurdle logic — from your fund's own inputs, with no authentication and no fund connection required. Results are illustrative estimates, not accounting or tax advice.

Is there a crypto fund fee calculator API?

Yes. The same POST /api/v1/calc/fee-calculator endpoint is a stateless, illustrative crypto fund fee calculator — pass management fee rate, performance fee rate, NAV, and prior high-water mark, and get back the fee breakdown, with no auth and no fund connection required.

Is there a high-water mark calculation API?

Yes, the same fee-calculator endpoint (POST /api/v1/calc/fee-calculator) applies a per-series high-water mark so performance fees accrue only on gains above the prior peak NAV — pass in your NAV history and fee terms and get back the fee breakdown.

Do the Nyx Fund calculator endpoints require an API key?

No. All seven calculator endpoints — fee, NAV validation, exposure analysis, operating cost, back-office savings, fund health, and LP report grading — are stateless and open with no authentication; an optional nyx_dk_ key only raises your daily rate limit.

Are the calculator API results real fund figures?

No. Every calculator endpoint returns illustrative estimates computed only from the arguments you pass in that single call — nothing is stored and nothing is tied to a real fund. Connect your exchanges in the full Nyx Fund product for live, audited figures.

What calculators does the Nyx Fund API expose?

Seven: the fee calculator (with high-water mark), NAV validator, exposure analysis, operating cost calculator, back-office savings calculator, fund health check, and LP report grader — the same deterministic engines behind the free tools at nyxchain.org/tools.

What's the rate limit on the free calculator API?

Five hundred requests per day with no card required, per caller. Passing an nyx_dk_ developer key raises that limit under the $49-a-month Developer plan or the bundled Platform plan.