LIVE ON BASE (8453), ETHEREUM (1) & XRPL • 1 FLAT CREDIT PER CALL
x402 Agent-to-Agent Wash-Volume Filter & Counterparty Intelligence
Separates real end-user x402 organic spend from circular agent-to-agent test/wash ping-pongs, self-loops, and sub-cent synthetic heartbeats. Includes drop-in Etherscan V2 wallet history compatibility (/v2/api) and Pre-Send Address-Poisoning Protection.
Instant Presets:
4 Heuristics Active • Verified Ready
Raw x402 Volume
$4,736.02
Verified Organic Spend
$2,711.00
Agent Wash / Test Volume
$2,025.02
Wash / Test Ratio
42.76%
Verified Organic Txs
3
Flagged Wash / Test Txs
11
4-Heuristic Deterministic Wash Classification
1. SELF_LOOP_FILTER
1 txs flagged
from.toLowerCase() === to.toLowerCase()
2. BIDIRECTIONAL_24H_PING_PONG
4 txs flagged
A <-> B circular loops within 24h
3. SUB_CENT_REPEATED_DUST_HEARTBEAT
6 txs flagged
< $0.01 USDC repeated > 5x / synthetic ping
4. NON_CIRCULAR_MERCHANT_RETENTION
3 verified txs
Unique payer -> merchant retained spend
Counterparty Leaderboard & Circular Flow Tagging
| Counterparty / Entity Label | Direction | Txs | Inflow (USD) | Outflow (USD) | Total Volume | Classification |
|---|---|---|---|---|---|---|
| 0x55aa66bb77cc88dd99ee00ff1122334455667788 x402 Ping-Pong Test Bot A |
BIDIRECTIONAL | 4 | $950.00 | $950.00 | $1,900.00 | PING_PONG_WASH |
| 0x7a1b2c3d4e5f60718293a4b5c6d7e8f901234567 Autonomous AI Research Agent #14 (Verified Payer) |
INBOUND | 1 | $1,250.00 | $0.00 | $1,250.00 | VERIFIED_ORGANIC |
| 0x3f8c9a12b4e6d8f0123456789abcdef012348899 DePIN Inference Cluster Settlement |
INBOUND | 1 | $840.25 | $0.00 | $840.25 | VERIFIED_ORGANIC |
| 0x91c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0 Enterprise MCP Tool Consumer |
INBOUND | 1 | $620.75 | $0.00 | $620.75 | VERIFIED_ORGANIC |
| 0xAF4107196680A0d2Ca7E027D77CcF3Eb2EEBdFd0 UnFee Protocol Treasury / x402 Router |
BIDIRECTIONAL | 1 | $125.00 | $125.00 | $250.00 | SELF_LOOP |
| 0xdead00000000000000000000000000000000beef Synthetic Sub-Cent Heartbeat Spammer |
INBOUND | 6 | $0.024 | $0.00 | $0.024 | DUST_HEARTBEAT |
Pre-Send Address-Poisoning & Lookalike Spoofing Guard (A3)
Detects prefix+suffix vanity lookalike poisoning (where an attacker matches the first 3–6 and last 3–6 hex characters of a frequent counterparty while middle bytes differ) and sub-cent dust poisoning vectors before you sign.
Ready — Click "Run Pre-Send Guard" to verify destination address against lookalike spoofing.
Drop-In API & Etherscan V2 Compatibility (1 Flat Credit)
# 1. x402 Wash-Volume & Organic Spend Filter
curl "https://unfee.xyz/api/v1/trace/x402-volume?address=0xAF4107196680A0d2Ca7E027D77CcF3Eb2EEBdFd0&chain=base"
# 2. Arkham-Style Counterparty Leaderboard (A2)
curl "https://unfee.xyz/api/v1/x402/counterparties?address=0xAF4107196680A0d2Ca7E027D77CcF3Eb2EEBdFd0&chain=base"
# 3. Etherscan V2 Drop-In Compatible Endpoint for Rotki / CryptTrace (A1)
curl "https://unfee.xyz/v2/api?chainid=8453&module=account&action=tokentx&address=0xAF4107196680A0d2Ca7E027D77CcF3Eb2EEBdFd0"
# 4. Pre-Send Address-Poisoning Guard (A3)
curl -X POST "https://unfee.xyz/api/v1/x402/address-guard" -H "Content-Type: application/json" \
-d '{"from":"0x1111222233334444555566667777888899990000","to":"0xAF419999999999999999999999999999999BdFd0","chain":"base"}'