Blockchain risk API for exchanges, brokers and AI agents

Keep illicit crypto off your platform, for about 90% less.

Screen every address and transfer through drop-in compatible KYT, address screening and sanctions APIs. Change the base URL, keep your integration, and get explainable AI risk reports on top.

Screen an address See the API

84 seconds: what ChainZen screens, why platforms have to, and how people and AI agents get started.

Why set it up

You are the off-ramp

Stolen, sanctioned and scam funds have to reach a regulated exchange or broker to become cash. Taint arrives on deposits and leaves on withdrawals.

Regulators hold you responsible

OFAC sanctions liability is strict. The FATF Travel Rule, EU MiCA and the Transfer of Funds Regulation make transaction screening a licence condition.

Every decision must be explainable

A rating is only useful if you can show a regulator why. ChainZen returns the evidence behind each verdict.

What happens on a screen

SanctionsChecked against the OFAC SDN digital-currency list, refreshed daily.
AttributionKnown labels and public explorer tags map the address to a category.
ExposureRecent counterparties are screened and valued in USD.
BehaviourFan-in, fan-out and rapid pass-through patterns raise the rating.

The highest of these is the verdict (Severe, High, Medium or Low), returned with its reasons, exposures and triggered rules. An AI review (Jev) can escalate a case for a human, but never downgrade one.

Try it now

Try a sanctioned address: 0x098B…2f96

Built for AI agents

Agents connect over MCP and get the same tools a compliance analyst uses: screen_address, check_sanctions, get_risk_report, prescreen_withdrawal, register_transfer and list_alerts.

claude mcp add --transport http chainzen https://chainzen.dev/api/mcp --header "Authorization: Bearer $CHAINZEN_KEY"

Pricing

$0.02

per address screen or KYT transfer

$0.10

per AI risk report

Free

sanctions screening

API

Send your key in the Token header (or X-API-Key for the sanctions endpoint).

Address Screening	`POST /api/risk/v2/entities`	Register an address
Address Screening	`GET /api/risk/v2/entities/{address}`	Risk, cluster, exposures, triggers
Sanctions	`GET /api/v1/address/{address}`	OFAC SDN identifications
KYT v2	`POST /api/kyt/v2/users/{userId}/transfers`	Register a transfer
KYT v2	`GET /api/kyt/v2/transfers/{id}[/alerts\|/exposures]`	Transfer summary, alerts, exposures
KYT v2	`POST /api/kyt/v2/users/{userId}/withdrawal-attempts`	Pre-screen a withdrawal
KYT v2	`GET /api/kyt/v2/withdrawal-attempts/{id}[/alerts\|/exposures\|/high-risk-addresses]`
KYT v1	`GET\|POST /api/kyt/v1/users/{userId}/transfers/{received\|sent}`	Legacy transfer API
KYT v1	`GET\|POST /api/kyt/v1/users/{userId}/withdrawaladdresses`
KYT v1	`GET\|POST /api/kyt/v1/users/{userId}/depositaddresses`
KYT v1	`GET /api/kyt/v1/users, /users/{userId}, POST /users/rename`
KYT v1	`GET /api/kyt/v1/alerts, POST /alerts/{id}/statuses`	Alerts with filters and status workflow
KYT	`GET /api/kyt/v1/categories, /api/kyt/v2/categories`
ChainZen	`GET /api/chainzen/v1/reports/{address}`	Risk report with AI review (JSON or ?format=markdown)
MCP	`POST /api/mcp`	MCP server for AI agents (Authorization: Bearer key)

curl -H "Token: $CHAINZEN_KEY" https://chainzen.dev/api/risk/v2/entities/0x098B716B8Aaf21512996dC57EB0615e2383E2f96

What it covers today

OFAC sanctions on every chain the SDN list covers, a small set of attribution labels, and direct (one-hop) on-chain exposure from public indexers. There is no address clustering or cross-chain tracing yet, and open label imports are still being built. Ratings support a compliance team's decision; they are not legal advice.