ForHosting KIT

Everything you need.
One Kit.

Hundreds of ready-made tasks — PDF, images, audio, OCR, text AI, scraping, data and more — behind a single REST API. Send a job, get a finished result by webhook. No servers, no per-model tokens, a price you can read.

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7554ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesVolume to density calculatorρ=m/V from mass and volumeAabuela$0.002Open phys.volume_to_density →New⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulation →New⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_number →New⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocity →New⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficient →New⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rate →New⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strain →New⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmission →New⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffness →New⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_spring →New⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertia →New⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation →

Popular capabilities

Loved right now, by real traffic.

The full catalog

Search or filter by category. Every capability is its own endpoint with a published price.

⚙️ Developer UtilitiesFree
Cosine calculator
cos(x) of an angle in radians, free
Hhedy
POST /math/cos$0.002
⚙️ Developer UtilitiesFree
cos⁻¹(x) calculator
arccosine in radians and degrees
Ggrace
POST /math/cos-1$0.002
⚙️ Developer UtilitiesFree
Bézout coefficients calculator
integers x, y with a·x + b·y = gcd
Ssamurai
POST /numth/bezout-identity$0.002
⚙️ Developer UtilitiesFree
Two-coin representable checker
test a target amount
Kkatherine
POST /numth/coin-representable-two$0.002
⚙️ Developer UtilitiesFree
Mediant of Two Fractions Calculator
Bbarbara
POST /numth/mediant-fraction$0.002
⚙️ Developer UtilitiesFree
Negative Pell equation solver
solvability and minimal solution
Ffrances
POST /numth/negative-pell$0.002
⚙️ Developer UtilitiesFree
Pierce expansion calculator
alternating unit products for a fraction
PPavilion
POST /numth/pierce-expansion$0.002
⚙️ Developer UtilitiesFree
Pythagorean triples from a leg
list all integer triples for one side
Aabuela
POST /numth/pythagorean-from-leg$0.002
⚙️ Developer UtilitiesFree
cos(2θ) calculator
double-angle cosine from θ in radians
Hhedy
POST /math/cos-2-theta$0.002
⚙️ Developer UtilitiesFree
Hyperbolic cosine calculator
cosh(x) online, free
Ggrace
POST /math/cosh$0.002
⚙️ Developer UtilitiesFree
Distinct parts partition count
q(n) ways with unique summands, free
Aabuela
POST /numth/distinct-partitions$0.002
⚙️ Developer UtilitiesFree
Gaussian Integer Division Calculator
Quotient and Remainder
Kkatherine
POST /numth/gaussian-integer-divide$0.002
⚙️ Developer UtilitiesFree
Gaussian integer factorization
factor a+bi into Gaussian primes
Ssamurai
POST /numth/gaussian-integer-factor$0.002
⚙️ Developer UtilitiesFree
Goldbach partition count
count prime pairs for an even number
Bbarbara
POST /numth/goldbach-partition$0.002
⚙️ Developer UtilitiesFree
Sum of three squares representation calculator
Ffrances
POST /numth/sum-three-squares-rep$0.002
⚙️ Developer UtilitiesFree
Sum of Two Squares Count
Calculate r₂(n)
Bbarbara
POST /numth/sum-two-squares-count$0.002
⚙️ Developer UtilitiesFree
Waring problem representation
greedy sum of k-th powers
PPavilion
POST /numth/waring-representation$0.002
⚙️ Developer UtilitiesFree
Cosine similarity calculator
score between -1 and 1, free online
Hhedy
POST /math/cosine-similarity$0.002
⚙️ Developer UtilitiesFree
Cullen number generator
calculate n × 2^n + 1
Kkatherine
POST /numth/cullen-number$0.002
⚙️ Developer UtilitiesFree
Digit factorial chain length calculator
Bbarbara
POST /numth/digit-factorial-chain$0.002
⚙️ Developer UtilitiesFree
Factorion checker
is n equal to the sum of its digit factorials?
Aabuela
POST /numth/factorion-check$0.002
⚙️ Developer UtilitiesFree
Fermat number generator
compute the n-th Fermat number 2^(2^n)+1
Ssamurai
POST /numth/fermat-number$0.002
⚙️ Developer UtilitiesFree
Repunit checker
is n all ones in decimal?
PPavilion
POST /numth/repunit-check$0.002
⚙️ Developer UtilitiesFree
Vampire Number Checker
Find the Fangs of a Number
Ffrances
POST /numth/vampire-number$0.002
⚙️ Developer UtilitiesFree
Additive prime checker
prime with prime digit sum, free
Ssamurai
POST /numth/additive-prime$0.002
⚙️ Developer UtilitiesFree
Balanced prime checker
test a prime using its neighbors
Bbarbara
POST /numth/balanced-prime$0.002
⚙️ Developer UtilitiesFree
Permutable Prime Checker
Test Every Digit Permutation
Kkatherine
POST /numth/permutable-prime$0.002
⚙️ Developer UtilitiesFree
Safe prime checker
test p and (p − 1) / 2
Ffrances
POST /numth/safe-prime$0.002
⚙️ Developer UtilitiesFree
Wieferich prime checker
test 2^{p−1} ≡ 1 (mod p²)
PPavilion
POST /numth/wieferich-prime$0.002
⚙️ Developer UtilitiesFree
Dudeney number checker
test cube roots and digit sums
Bbarbara
POST /numth/dudeney-number$0.002
⚙️ Developer UtilitiesFree
Evil number checker
even number of ones in binary
PPavilion
POST /numth/evil-number$0.002
⚙️ Developer UtilitiesFree
Home Prime Calculator
Iterate Prime-Factor Concatenation
Ffrances
POST /numth/home-prime$0.002
⚙️ Developer UtilitiesFree
Lucas prime checker
is the n-th Lucas number prime?
Ssamurai
POST /numth/lucas-prime$0.002
⚙️ Developer UtilitiesFree
Mersenne prime checker using the Lucas-Lehmer test
Kkatherine
POST /numth/mersenne-prime-check$0.002
⚙️ Developer UtilitiesFree
Prime triplet finder
list (p,p+2,p+6) and (p,p+4,p+6) up to n
Aabuela
POST /numth/prime-triplet$0.002
⚙️ Developer UtilitiesFree
Alternating digit sum calculator
divisibility by 11
Ffrances
POST /numth/alternating-digit-sum$0.002
⚙️ Developer UtilitiesFree
Balanced ternary converter
convert integers using -1, 0 and 1
Bbarbara
POST /numth/balanced-ternary$0.002
⚙️ Developer UtilitiesFree
Digital root in base
repeated base-b digit sum to a single digit
Ssamurai
POST /numth/digital-root-base$0.002
⚙️ Developer UtilitiesFree
Equidigital Number Checker
Compare Factorization Digits
Kkatherine
POST /numth/equidigital-number$0.002
⚙️ Developer UtilitiesFree
Multiplicative persistence calculator
digit product steps to one digit
Aabuela
POST /numth/multiplicative-persistence$0.002
⚙️ Developer UtilitiesFree
Depressed cubic solver
Cardano roots of t³ + pt + q = 0
Aabuela
POST /algebra/depressed-cubic$0.002
⚙️ Developer UtilitiesFree
Inverse variation calculator
find k and predict y
Kkatherine
POST /algebra/inverse-variation$0.002
⚙️ Developer UtilitiesFree
Linear equation from slope and point
point-slope and y=mx+b, free
Aabuela
POST /algebra/linear-equation-from-slope-point$0.002
⚙️ Developer UtilitiesFree
Literal equation solver
rearrange formulas for any variable
Ffrances
POST /algebra/literal-equation$0.002
⚙️ Developer UtilitiesFree
Solve quadratic by factoring
binomials and roots, free calculator
PPavilion
POST /algebra/quadratic-by-factoring$0.002
⚙️ Developer UtilitiesFree
Quadratic with complex roots calculator
exact conjugate pair
Kkatherine
POST /algebra/quadratic-complex-roots$0.002
⚙️ Developer UtilitiesFree
Vertex form to standard form calculator
find a, b, and c
Bbarbara
POST /algebra/quadratic-from-vertex-form$0.002
⚙️ Developer UtilitiesFree
Quadratic in form solver
substitution and real solutions
Ffrances
POST /algebra/quadratic-in-form$0.002
⚙️ Developer UtilitiesFree
Parabola x-intercepts from vertex form
find roots of a(x−h)²+k
PPavilion
POST /algebra/quadratic-vertex-to-intercepts$0.002
⚙️ Developer UtilitiesFree
Cube equation solver
solve x³ = k for all three cube roots
Ssamurai
POST /algebra/solve-cube-equation$0.002
⚙️ Developer UtilitiesFree
Sum and product of roots calculator
Vieta for ax²+bx+c, free
Ssamurai
POST /algebra/sum-product-of-roots$0.002
⚙️ Developer UtilitiesFree
Two-step linear equation solver
exact answers with steps
Bbarbara
POST /algebra/two-step-linear-equation$0.002
⚙️ Developer UtilitiesFree
Y-intercept of a line calculator
set x=0 in ax+by+c=0
Ssamurai
POST /algebra/y-intercept-of-line$0.002
⚙️ Developer UtilitiesFree
Casting out nines check
verify a sum or product with mod 9
Ssamurai
POST /numth/casting-out-nines$0.002
⚙️ Developer UtilitiesFree
Imaginary quadratic class number calculator
count reduced forms
Kkatherine
POST /numth/class-number-imaginary$0.002
⚙️ Developer UtilitiesFree
Fibonacci coding converter
positive integer to binary code ending in 11
PPavilion
POST /numth/fibonacci-coding$0.002
⚙️ Developer UtilitiesFree
Hofstadter Q sequence
n-th term of Q(n) recurrence, free
Ssamurai
POST /numth/hofstadter-q$0.002
⚙️ Developer UtilitiesFree
Narayana's cows sequence calculator
find the n-th term
Bbarbara
POST /numth/narayana-cows$0.002
⚙️ Developer UtilitiesFree
p-adic valuation calculator
exponent of prime p dividing n
PPavilion
POST /numth/p-adic-valuation$0.002
⚙️ Developer UtilitiesFree
Perrin sequence term
calculate the n-th Perrin number
Kkatherine
POST /numth/perrin-sequence$0.002

How it works

1

Get your key

Create an account with your email and add balance when you need it. No subscription, no sales call.

2

Call the endpoint

One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.

3

Collect the result

Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.

Pay only for what you use

No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.

Free tools
$0.00

On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.

Pay-as-you-go
Per task
$0.002+

The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.

Balance
$10.00+

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