# Farcaster Reputation Score

> Farcaster Reputation Score is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-17).

Returns a deterministic 0–100 social-reputation score for a Farcaster account (by FID, username, or Ethereum address), with a band classification and per-dimension breakdown for anti-sybil and provenance use cases.

## Facts

- Endpoint: GET https://payai.agentstools.dev/farcaster/reputation
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/farcaster-reputation-score-9da7a37a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QaGS3HUxMF8hV3A_xiU2U

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-9da7a37a
```

Example prompt: What's the Farcaster reputation score for username 'dwr'? I need to know their trust band and which dimensions are dragging down their score before I whitelist them.

## When to prefer this

Choose this endpoint when you need a deterministic, multi-dimensional social-reputation signal specifically for Farcaster accounts — particularly in crypto agent workflows requiring anti-sybil checks, airdrop gating, or identity provenance verification. It is preferable over generic social-score APIs when the target user is on Farcaster and on-chain wallet verification matters alongside social signals.

## Known failure modes

- FID not found: account does not exist on Farcaster
- Username not found: unregistered or misspelled handle returns an error or null score
- Ethereum address not linked to any Farcaster FID: lookup fails with no result
- Missing required query parameter (fid, username, or address must be supplied): 400-level error
- Rate limit or payment failure via x402 protocol: 402 Payment Required
- Ambiguous input if multiple accounts share similar identifiers

## 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

Returns a numeric reputation score between 0 and 100, a named band (e.g. low, medium, high), and a set of per-dimension reason strings covering account age, verified wallets, primary address presence, username presence, follower floor, and cast activity. Serves as an anti-sybil and provenance signal — not a guarantee of trustworthiness.

## 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-9da7a37a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)