Free DeFi & Crypto Tools
Free, no-signup interactive calculators and checklists built on DeFi Intel's research dataset and API — from JSON repair, EVM rug checks, gas tracking, token counting and language detection to compliance checklists, yield comparison, treasury analysis and jurisdiction shopping.
Every tool is a single self-contained HTML page — no external trackers beyond Plausible analytics — and is safe to bookmark, embed, or share. For affiliate broker / wallet / hardware comparisons see /tools/; for our research catalogue see research.
Free tools
JSON Repair / Formatter
Paste broken, truncated or LLM-generated JSON and get valid, pretty-printed JSON in one click. Fixes trailing commas, unquoted keys, single quotes and missing brackets. Free: 5 repairs/day — no signup; pay-per-use via API beyond that.
Open the tool →EVM Rug Check
Paste any token/contract address on Base or EVM chains and get an instant rug-pull risk score, scam flags, liquidity and pair-age analysis — before you buy. Free: 5 checks/day.
Check a token →Base Gas Price Tracker
Live Base network gas prices — fast, standard and slow — plus the current block. Check fees before you send, swap or deploy. Free: 5 lookups/day.
Check gas now →Token & Word Counter
Count words, characters and AI tokens in any text — and trim it to a token budget. Essential for prompt engineers, writers and students. Free: 5 uses/day.
Count tokens →Language & Tone Detector
Identify the language, script and tone of any text instantly. Great for writers, translators and localization teams. Free: 5 detections/day.
Detect language →Website Screenshot
Enter any URL and get a full-viewport screenshot as an image in seconds — previews, reports, thumbnails. Free: 5 screenshots/day.
Capture a page →Clean Markdown
Free web-to-markdown: paste a URL and get a clean, readable Markdown version of the page — stripped of nav, ads and clutter. Great for LLM context, notes and research.
Open the tool →HTML Table Extractor
Free HTML table extractor: paste a URL and get every data table as clean JSON — rows, headers and cells. Ideal for scraping comparison tables, financials and specs.
Open the tool →Regex & Cron Tester
Free regex and cron tester: test a regex pattern against a string, or validate a 5-field cron expression — with match/error details. Built for developers and DevOps.
Open the tool →SQL Validator
Free SQL validator: check any single SQL statement for syntax, parse it into an AST, and surface injection-style risks before you run it. No signup, 5 free validations/day..
Open the tool →Text Diff Generator
Free text diff: paste an original and an updated version and get a unified diff with added/removed lines. Great for reviewing edits, contracts and code.
Open the tool →DNS Security Audit
Free DNS security audit: check any domain for SPF, DKIM, DMARC, DNSSEC and TLS — with a risk score and per-check details. See how secure your domain email and DNS really are.
Open the tool →SMTP / Email Deliverability Check
Free SMTP email check: verify an email address, its domain MX records, and server deliverability in one call. Catch invalid or risky addresses before you send.
Open the tool →Redirect Chain Tracer
Free redirect chain tracer: enter a URL and see every redirect hop with status codes — spot broken or bloated redirects. Great for SEO and link audits.
Open the tool →Semantic Text Chunker
Free semantic chunker: split long text into coherent, token-aware chunks by meaning — not arbitrary cuts. Built for RAG, embeddings and LLM pipelines.
Open the tool →Prompt Injection Shield
Free prompt injection shield: paste text and see it sanitized for safe LLM use, with any detected injection patterns flagged. Protect your AI pipelines from jailbreaks.
Open the tool →Stablecoin Supply Tracker
Free stablecoin supply tracker: live circulating supply, 24h change and on-chain status for USDC, USDT and more, by chain. Track stablecoin flows in real time.
Open the tool →Pre-Swap Simulator
Free pre-swap simulator: simulate any token swap on Base — amount out, price impact, fees and gas — before you sign. Avoid bad trades and front-running surprises.
Open the tool →Pending Liquidations Monitor
Free DeFi liquidation monitor: see liquidation volume by protocol and chain — 24h, 7d and 30d totals. Spot stress in lending markets early.
Open the tool →Smart Money Wallet Tracker
Free smart money wallet tracker: paste any wallet address and see its activity and smart-money signals on Base. Track what sophisticated wallets are doing.
Open the tool →Protocol Health Checker
Free DeFi protocol health check: see the live status and health of lending and DeFi protocols on Ethereum — TVL, utilization, and risk signals. No signup, 5 free checks/day..
Open the tool →Multi-Chain Liquidity Depth
Free DEX liquidity depth checker: see how much liquidity backs any token across chains — depth matters when you trade. No signup, 5 free lookups/day..
Open the tool →OFAC / Sanctions & PEP Check
Free OFAC/PEP screening: check a wallet address or name against sanctions and politically-exposed-person signals. A first-pass compliance screen.
Open the tool →EU VAT Number Validator
Free EU VAT number validator: check any European VAT number against the VIES registry — validity, name and address. Verify B2B suppliers fast.
Open the tool →Website Tech Stack Detector
Free tech stack detector: enter any URL and see its CMS, CDN, framework, hosting and analytics — a quick tech-stack fingerprint for sales and research. No signup, 5 free lookups/day..
Open the tool →Farcaster Sentiment Spike
Free Farcaster sentiment checker: see mention spikes for any token ticker on Farcaster in the last 24h — early signal of social momentum. No signup, 5 free lookups/day..
Open the tool →SEC EDGAR Filing Diff
Free SEC EDGAR diff: compare risk factors and other items between a company’s latest and prior 10-K/10-Q filings. See what changed in regulatory filings.
Open the tool →Financial Article Reader
Free financial article reader: paste a URL and get the article title, author and clean full text — readable without clutter. For research and personal use.
Open the tool →MiCA Compliance Checklist
25-question self-assessment for crypto-asset service providers (CASPs) under EU Regulation 2023/1114. Per-category breakdown across authorisation, governance, AML/CFT, operational and stablecoin readiness. Print-to-PDF report.
Open the checklist →Stablecoin Yield Calculator
Compare USDC APY across 10 venues (Aave, Compound, Spark, Morpho, Sky, Pendle, Hyperliquid, Coinbase, Kraken, Binance). Adjust notional, lock-up, risk tolerance — see net APY after fees and slippage. CSV export.
Open the calculator →Treasury NAV Calculator
Per-share BTC backing and premium / discount-to-NAV for 10 listed crypto-treasury companies. Adjust BTC spot price; flag overvalued vs undervalued names. Holdings sourced from issuer 8-K filings via DeFi Intel's treasury dataset.
Open the calculator →Jurisdiction Compare
Side-by-side comparison of 20 crypto-licensing jurisdictions: regulator, framework, capital, tax, fees, time-to-license, sample CASPs, pros/cons. Pulls from DeFi Intel's 50,275-word jurisdiction guides. CSV export.
Open the comparator →About this set
These tools sit alongside DeFi Intel's affiliate-disclosed broker / wallet / hardware comparisons at /tools/. The free tools here are independent: no affiliate links, no paid placement, and no sign-up wall. Underlying data comes from the same DeFi Intel research dataset that powers the rest of the site.
If you want to embed a tool inside a research piece, syllabus or compliance brief, link to the canonical URL — every tool stays at a stable path. For methodology, see /methodology.
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