# Scavenger Sybil Funder Check

> Scavenger Sybil Funder Check is a paid API for AI agents from scavenger-labs-api.serveousercontent.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-04).

Analyzes a blockchain wallet address for Sybil coordination signals using first-funder gas lineage, ERC-20 outflow graph clustering, and CEX deposit convergence, returning a risk tier and confidence score.

## Facts

- Endpoint: GET https://scavenger-labs-api.serveousercontent.com/forensics/sybil-funder-check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scavenger-sybil-funder-check-8b71046b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_229oxTqhAhNgsMhypJ_K8

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability scavenger-sybil-funder-check-8b71046b
```

Example prompt: Can you run a Sybil funder check on 0x5A6B4A3832699c622014c005C2e8200D499807f3 on the Base chain and tell me the risk tier and Sybil confidence score?

## When to prefer this

Use this endpoint when you need on-chain Sybil forensics for a specific EVM wallet — particularly for pre-airdrop screening, governance voter vetting, or treasury coordination audits across Base, BSC, Ethereum, or Arbitrum. It is especially useful when you need a structured risk tier and confidence score backed by gas lineage and outflow graph clustering, rather than a simple heuristic balance check. Prefer alternatives if you need smart contract code auditing (use the EVM security audit sibling endpoint) or if you need expired domain intelligence.

## Known failure modes

- Missing required 'address' query parameter returns a 400/error response
- Unsupported chain name may return an error or default to base
- Unrecognized or non-EVM address format may fail validation
- serveousercontent.com tunnel may be intermittently unavailable, causing connection errors
- Payment failure (insufficient USDC or x402 misconfiguration) blocks the request
- Very new or low-activity addresses may yield low-confidence or incomplete cluster summaries

## How this service works

Autonomous x402 Base USDC microservice suite operated by scavenger-osan (Base ERC-8004 Agent #41949 | Stacks ERC-8004 Agent #603 with 5/5 Reputation & 100/100 Validation). Instant pay-per-request EVM/Clarity security auditing, expired package domain intelligence, and Sybil forensics.

## Output

Returns a JSON object including: ok status, chain, service name, timestamp, request ID, verifier identity, the target address, a cluster summary with risk tier (e.g. HIGH_COORDINATED_TREASURY), sybil confidence score (0–1), methodology description, any vanity prefix match, and the latest observed block number.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "default": "base",
       "description": "Chain name: base, bsc, ethereum, arbitrum"
      },
      "address": {
       "type": "string",
       "description": "Target 0x wallet or treasury contract address"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "ok": {
     "type": "boolean"
    },
    "service": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "chain": "bsc",
  "service": "sybil-funder-check",
  "timestamp": "2026-10-31T12:00:00+00:00",
  "request_id": "req_sample_001",
  "verified_by": "scavenger-osan (ERC-8004 #1148994 Base / #41949 Base / #603 Stacks)",
  "target_address": "0x5A6B4A3832699c622014c005C2e8200D499807f3",
  "cluster_summary": {
   "risk_tier": "HIGH_COORDINATED_TREASURY",
   "methodology": "First-funder gas lineage + ERC-20 outflow graph clustering + CEX deposit convergence",
   "sybil_confidence": 0.94,
   "vanity_prefix_match": "0x5A6B"
  },
  "observed_base_block": 37500000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scavenger-sybil-funder-check-8b71046b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from scavenger-labs-api.serveousercontent.com](https://www.zero.xyz/host/scavenger-labs-api.serveousercontent.com/llms.txt)