# Farcaster Reputation Score

> Farcaster Reputation Score is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-15).

Returns a deterministic 0–100 social reputation score for a Farcaster user (by FID, username, or Ethereum address), with a band classification, per-dimension breakdowns, and anti-sybil signals.

## Facts

- Endpoint: GET https://api.agentstools.dev/farcaster/reputation
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/farcaster-reputation-score-092f6bcb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dz3Fl62C3gqwW38QLSIKh

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 farcaster-reputation-score-092f6bcb
```

Example prompt: Can you pull the Farcaster reputation score for the username 'vitalik' — I want to know their score, band, and why they got scored that way before I let them interact with my agent?

## When to prefer this

Use this endpoint when you need a deterministic, multi-dimensional reputation score for a Farcaster identity — especially in crypto agent workflows requiring anti-sybil checks, provenance validation, or trust gating. Prefer it over generic social metrics when you specifically need Farcaster-native signals (FID, casts, verified wallets) combined into a single normalized score. Also appropriate when you have an Ethereum address and want to resolve its Farcaster reputation indirectly.

## Known failure modes

- No FID/username/address provided — returns 400 or error requiring at least one query parameter
- Unknown or non-existent Farcaster username — returns error or zero-score result
- Invalid Ethereum address format — returns validation error
- FID below minimum (< 1) — rejected by schema validation
- Payment not completed (x402) — returns 402 Payment Required
- Rate limit exceeded — returns 429 Too Many Requests

## How this service works

Deterministic Farcaster social-reputation score from zero to one hundred for a fid, username or address. Combines account age, verified wallets, a primary address, username presence, follower floor and cast activity into a score, a band and per-dimension reasons. Anti-sybil and provenance signal for crypto agents. Reputation indicators, not a guarantee.

## Output

A JSON object containing a numeric reputation score from 0 to 100, a categorical band (e.g. low/medium/high), and per-dimension reason strings covering account age, verified wallets, primary address presence, username presence, follower floor, and cast activity. Designed as an anti-sybil and provenance signal for crypto agents.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "fid": {
       "type": "integer",
       "minimum": 1,
       "description": "Farcaster ID (FID), a positive integer"
      },
      "address": {
       "type": "string",
       "description": "Ethereum address to score via its linked FID"
      },
      "username": {
       "type": "string",
       "description": "Farcaster username, without the at-sign"
      }
     }
    }
   },
   "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/farcaster-reputation-score-092f6bcb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)