Onchain Diary
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Onchain Diary

On-chain risk intelligence platform for Web3 builders and traders. Real-time API to check any wallet address or token for scams, honeypots, and malicious activity across 10+ chains. Includes a 120+ term Web3 glossary and free crypto calculators.

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Onchain Diary

On-chain risk intelligence platform for Web3 builders and traders. Real-time API to check any wallet address or token for scams, honeypots, and malicious activity across 10+ chains. Includes a 120+ term Web3 glossary and free crypto calculators.

The Problem

Every day, crypto users lose millions to rug pulls, honeypots, and malicious contracts. Most people transact blind — they send funds to unknown addresses, swap unverified tokens, and sign transactions without checking what’s on the other side.

Onchain Diary exists to change that: check before you transact.

What’s Inside

Risk Intelligence API

The core product. Query any wallet address or token contract across 10+ chains and get back a structured risk score.

  • Address Risk Scoring — Checks wallets against GoPlus, Etherscan, and community blacklists. Returns sanctions status, mixer interactions, and fraud signals.
  • Token Safety Check — Detects honeypots, hidden taxes, rug-pull vectors, and holder concentration before you trade.
  • Multi-chain Coverage — Ethereum, Arbitrum, Base, BSC, Polygon, Optimism, Avalanche, and more.

Web3 Glossary

120+ terms explained in plain language — from Airdrops to ZK-Rollups. No jargon, no gatekeeping. Written for developers and traders who are new to the space and need clear answers fast.

Free Crypto Tools

Calculators that solve real problems:

  • Gas Fee Calculator — Estimate transaction costs across chains
  • Token Vesting Calculator — Model unlocking schedules and cliff periods
  • Impermanent Loss Calculator — Understand LP risk before you provide liquidity
  • Position Sizing Calculator — Size trades based on risk tolerance

How It Works

The API aggregates risk signals from multiple data providers — GoPlus Security, Etherscan labels, OKX DEX data, and community-maintained blacklist databases. Each signal contributes to a composite risk score that’s easy to interpret: green, yellow, or red.

# Check an address
curl https://api.theonchaindiary.com/v1/address/0x...?chain=eth

# Check a token
curl https://api.theonchaindiary.com/v1/token/0x...?chain=arb

Who It’s For

  • Traders — Verify tokens before swapping. Check counterparties before sending funds.
  • Developers — Integrate risk checks into dApps, wallets, and trading bots via API.
  • Researchers — Access structured on-chain risk data for analysis and reporting.