V3 Blacklist Endpoint
GET /api/v3/blacklist/:address
Quick check for stablecoin blacklist status. This endpoint is optimized for fast, lightweight lookups and does not require authentication.
No Authentication Required
The blacklist endpoint is publicly accessible with high rate limits (300 req/min) for quick integration checks.
Request
URL
GET https://api.radar.getfailsafe.com/api/v3/blacklist/:addressPath Parameters
addressRequiredResponse
{
"address": "0x1234567890abcdef1234567890abcdef12345678",
"chain": "ethereum",
"is_blacklisted": true,
"blacklists": {
"usdt": true,
"usdc": false
},
"source": "on-chain",
"confidence": 1.0,
"latency_ms": 127
}Response Fields
| Field | Type | Description |
|---|---|---|
address | string | The queried address |
chain | string | Detected blockchain network |
is_blacklisted | boolean | True if on any stablecoin blacklist |
blacklists.usdt | boolean | Tether (USDT) blacklist status |
blacklists.usdc | boolean | Circle (USDC) blacklist status |
source | string | Data source (on-chain, proprietary) |
confidence | number | Confidence score (0.0 - 1.0) |
latency_ms | number | Request processing time in ms |
Example Responses
Blacklisted Address
{
"address": "0xd882cfc20f52f2599d84b8e8d58831bf615068b1",
"chain": "ethereum",
"is_blacklisted": true,
"blacklists": {
"usdt": true,
"usdc": true
},
"source": "on-chain",
"confidence": 1.0,
"latency_ms": 89
}Clean Address
{
"address": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
"chain": "ethereum",
"is_blacklisted": false,
"blacklists": {
"usdt": false,
"usdc": false
},
"source": "on-chain",
"confidence": 1.0,
"latency_ms": 95
}Non-EVM Address
{
"address": "bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh",
"chain": "bitcoin",
"is_blacklisted": false,
"blacklists": {
"usdt": false,
"usdc": false
},
"source": "chain_detection",
"confidence": 1.0,
"latency_ms": 12,
"note": "Stablecoin blacklists only apply to EVM addresses"
}Chain Support Note
Stablecoin blacklists (USDT/USDC) only apply to EVM-compatible addresses. Non-EVM addresses (Bitcoin, Solana, etc.) will return
is_blacklisted: false with an explanatory note in the response.Rate Limits
/api/v3/blacklist/:addressStablecoin blacklist check
Sample cURL Request
curl https://api.radar.getfailsafe.com/api/v3/blacklist/0x1234567890abcdef1234567890abcdef12345678
Common Use Cases
Pre-Transaction Checks
Quick validation before processing stablecoin transfers to avoid frozen funds.
Compliance Screening
Fast blacklist checks during user onboarding or KYC processes.
Bulk Validation
High-volume address screening with 300 req/min rate limit.
Real-Time Monitoring
Continuous monitoring of counterparty addresses in DeFi protocols.
Need Full Intelligence?
For comprehensive risk assessment, use the Intel endpoint.