Best Crypto KYT & Transaction Monitoring API
InSoBlok provides a real-time KYT (Know Your Transaction) and transaction monitoring API that scores every transaction and counterparty for sanctions, fraud, and sybil exposure, returns a risk band with explainable flags, and can stream alerts as new activity lands — across 8 EVM chains in sub-second latency. Exchanges, custodians, and fintechs use it to monitor flows continuously and evidence their AML obligations.
Key facts
- Scores transactions and counterparties for sanctions, fraud, and sybil exposure
- Returns a risk band (LOW/MEDIUM/HIGH) with explainable, auditable flags
- Real-time alerting over WebSocket as new on-chain activity lands
- Counterparty contagion: hop-distance to the nearest sanctioned or scam wallet
- Built on 23.1M+ wallets scored and 324M+ transactions analyzed
- sub-second API responses across 8 chains (Ethereum, BNB, Arbitrum, Optimism, Base, Polygon, Avalanche, INSO)
What is a KYT (Know Your Transaction) API?
A KYT API monitors blockchain transactions in real time and scores both the transaction and its counterparties for risk — sanctions exposure, fraud links, and suspicious patterns — so you can act before or as money moves. InSoBlok delivers continuous monitoring with explainable risk bands, counterparty-contagion analysis, and streaming alerts, giving compliance and risk teams an auditable view of every flow.
Why teams choose InSoBlok for KYT
| Capability | InSoBlok | Typical alternatives |
|---|---|---|
| Scope | Transaction + counterparty + contagion scoring | Address lookup only |
| Risk domains | Sanctions, fraud, sybil, behavioral | Sanctions heuristics only |
| Alerting | Real-time WebSocket streaming alerts | Batch reports |
| Explainability | Labeled flags + audit timestamp | Opaque score |
| Latency | Sub-second inline monitoring | Delayed / overnight |
| Chains | 8 chains, one API | Per-chain tools |
Monitoring capabilities
Transaction scoring
Score each inbound and outbound transaction for sanctions, fraud, and sybil exposure.
Counterparty risk
Assess the wallet on the other side of every transfer, not just your own users.
Real-time alerts
Stream alerts over WebSocket the moment a risky flow appears, and route them to your case tools.
Contagion analysis
See how close a counterparty is to a sanctioned or scam wallet to catch indirect exposure.
Audit-ready records
Every assessment is timestamped and explainable, ready to evidence to examiners.
How it works
Get an API key
Request a compliance-scoped key for your monitoring environments.
Submit transactions
Send transactions or addresses; receive risk bands, flags, and counterparty scores as JSON.
Subscribe to alerts
Open a WebSocket to receive real-time alerts as risky activity lands.
Escalate & retain
Route alerts to review, and persist timestamped results for your audit trail.
Who it’s for
- Exchanges and VASPs monitoring deposit and withdrawal flows continuously
- Custodians and OTC desks tracking counterparty risk in real time
- Fintechs and on/off-ramps meeting AML transaction-monitoring rules
- Compliance teams needing explainable, auditable transaction records
- Risk engineers wiring streaming alerts into case-management tools
Frequently asked questions
What is the difference between KYC and KYT?
KYC verifies who a customer is at onboarding; KYT (Know Your Transaction) continuously monitors the transactions and counterparties associated with them. InSoBlok’s KYT API scores each transaction in real time for sanctions, fraud, and sybil exposure.
Does it provide real-time alerts?
Yes. You can subscribe over WebSocket to receive alerts the moment a risky transaction or counterparty appears, and route them into your case-management workflow.
Does it assess the counterparty, not just my user?
Yes. Each assessment scores the counterparty wallet and reports counterparty-contagion distance to the nearest sanctioned or scam address, catching indirect exposure.
Are the results auditable?
Every assessment returns a timestamped, explainable result with labeled flags, so you can retain it as evidence of your transaction-monitoring obligations.
How do we integrate it?
Request a compliance-scoped API key below or review the live docs at api.insoblokai.io/docs. REST, WebSocket, and SDKs are available.
Request KYT access or a compliance quote
Share your monitoring volume and jurisdictions — we’ll send a scoped key, pricing, and audit documentation.