LogiGrain — Logic Tools for AI Agents

LOGIC TOOL NODE

LogiGrain is an atomic computation node designed for AI agents and developers.
Each tool is a single-function endpoint — precise, stateless, and callable.
x402 micropayment ENABLED — autonomous agents pay per call via USDC on Base.

Sorry, humans. AI agents only.

Available Tools

Compound Interest

compound_interest.grain

Computes future value with compound interest. Supports USD, JPY, and USDC with optional monthly deposits.

GET /api/compound?principal=10000&rate=7&years=20

Currency Converter

currency_converter.grain

Real-time conversion across 22 currencies. Americas, Europe, Asia, Africa, and Crypto including USDC, ETH, BTC.

GET /api/convert?from=USD&to=JPY&amount=100

unit_converter.grain

Universal unit conversion across 8 categories: length, weight, temperature, speed, data, area, volume, and energy.

GET /api/convert-unit?value=100&from=kilometer&to=mile

json_validator.grain

Format, validate, and minify JSON. Detects errors with precise location. Returns key count, depth, size, and type analysis.

GET /api/json?action=format&input={...}

Token Cost Estimator

token_cost.grain

Compare AI API costs across models. Calculate break-even vs x402 pricing for autonomous agent operations.

GET /api/token-cost?input=1000&output=500&requests=100

Probability & Bayes

probability.grain

Bayes theorem, conditional probability, combinations, permutations, and expected value for AI decision support.

GET /api/probability?type=bayes&pa=0.01&pba=0.9&pbna=0.05

Date Calculator

date_calculator.grain

Date difference, business days, Unix timestamp conversion, and date arithmetic for scheduling and time-based reasoning.

GET /api/date?action=diff&start=2026-01-01&end=2026-12-31

math_validator.grain

Evaluate and validate mathematical expressions with deterministic precision. Supports variables, functions, and constants.

GET /api/math?expr=sqrt(144)+2^10

Code Syntax Checker

code_validator.grain

Deterministic syntax validation for JavaScript, JSON, HTML, and CSS. Returns precise error locations for AI output verification.

GET /api/code?lang=javascript&code=...

realtime_feed.grain

Real-time crypto prices, forex rates, and market data. Structured output for autonomous agent decision-making.

GET /api/feed?type=crypto&symbols=BTC,ETH,XLM

API Reference

GET

https://logigrain.net/api/compound?principal=10000&rate=7&years=20&monthly=0

principal (required) — initial amount
rate (required) — annual rate in %
years (required) — duration
monthly (optional) — monthly deposit

→ {"result":38697,"invested":10000,"gain":28697,"multiplier":3.87}

GET

https://logigrain.net/api/convert?from=USD&to=JPY&amount=100

from (required) — source currency code
to (required) — target currency code
amount (optional, default: 1)

→ {"result":14950,"rate":149.5,"from":"USD","to":"JPY","amount":100}

Node Status

Status

ACTIVE

Last Verified

—

Uptime

—

x402 Support

ENABLED

llms.txt robots.txt sitemap.xml