# Blockint C3 Contributor Leaderboard

> Blockint C3 Contributor Leaderboard is a paid API for AI agents from blockint.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).

Returns the top C3 community contributors ranked by reports submitted, points earned, cases resolved, and badges awarded.

## Facts

- Endpoint: GET https://blockint.ai/api/v1/leaderboard?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockint-c3-contributor-leaderboard-e8924af2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bS_dXZh7fgwUSfbsmQNVj

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 blockint-c3-contributor-leaderboard-e8924af2
```

Example prompt: Show me the top 25 contributors on the Blockint C3 leaderboard, ranked by their reports, points, and badges.

## When to prefer this

Use this endpoint when you need to surface top community contributors in the Blockint C3 fraud reporting ecosystem, or when building dashboards, gamification layers, or trust scoring tools that rely on contributor activity metrics. Prefer this over individual report or screening endpoints when the goal is ranking or community analytics rather than screening a specific address or domain.

## Known failure modes

- limit parameter out of range (must be 1-100) returns a validation error
- service unavailable or timeout if upstream database is unreachable
- empty result if no contributors exist yet
- payment failure if USDC balance is insufficient for the $0.01 fee

## How this service works

List top C3 contributor accounts ranked by reports, points, cases, and badges. All anonymous submissions share one account.

## Output

A ranked list of up to 100 C3 contributor accounts, each with metrics including number of reports submitted, points earned, cases resolved, and badges received. Anonymous submissions are aggregated under a single shared account.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "number",
       "maximum": 100,
       "minimum": 1,
       "description": "Number of contributors to return (default 50, max 100)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockint-c3-contributor-leaderboard-e8924af2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockint.ai](https://www.zero.xyz/host/blockint.ai/llms.txt)