eskyee/agentbot-opensource/neynar

Name: neynar
Author: eskyee

Claude Code and agent skill by eskyee/agentbot-opensource

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Interact with Farcaster via Neynar API. Use when the user wants to read Farcaster feeds, look up users, post casts, search content, or interact with the Farcaster social protocol. Requires NEYNAR_API_KEY.

Install

npx vskill@latest install eskyee/agentbot-opensource/neynar

SKILL.md

Neynar (Farcaster API)

Interact with the Farcaster decentralized social protocol via Neynar's API.

Quick Start

Setup

Get an API key from dev.neynar.com
Create config:

bash

mkdir -p ~/.clawdbot/skills/neynar
cat > ~/.clawdbot/skills/neynar/config.json << 'EOF'
{
  "apiKey": "YOUR_NEYNAR_API_KEY",
  "signerUuid": "YOUR_SIGNER_UUID"
}
EOF

Note: signerUuid is only required for posting casts. Get one via Neynar's signer management.

Verify Setup

bash

scripts/neynar.sh user dwr.eth

Core Concepts

FID — Farcaster ID, a permanent numeric identifier for each user
Cast — A post on Farcaster (like a tweet)
Channel — Topic-based feeds (like subreddits)
Frame — Interactive mini-apps embedded in casts

Usage

User Lookup

bash

# By username
scripts/neynar.sh user vitalik.eth
 
# By FID
scripts/neynar.sh user --fid 5650
 
# Multiple users
scripts/neynar.sh users dwr.eth,v,jessepollak

Read Feed

bash

# User's casts
scripts/neynar.sh feed --user dwr.eth
 
# Channel feed
scripts/neynar.sh feed --channel base
 
# Trending feed
scripts/neynar.sh feed --trending
 
# Following feed (requires signer)
scripts/neynar.sh feed --following

Search

bash

# Search casts
scripts/neynar.sh search "ethereum"
 
# Search users
scripts/neynar.sh search-users "vitalik"
 
# Search in channel
scripts/neynar.sh search "onchain summer" --channel base

Get Cast

bash

# By hash
scripts/neynar.sh cast 0x1234abcd...
 
# By URL
scripts/neynar.sh cast "https://warpcast.com/dwr.eth/0x1234"

Post Cast (requires signer)

bash

# Simple cast
scripts/neynar.sh post "gm farcaster"
 
# Reply to cast
scripts/neynar.sh post "great point!" --reply-to 0x1234abcd
 
# Cast in channel
scripts/neynar.sh post "hello base" --channel base
 
# Cast with embed
scripts/neynar.sh post "check this out" --embed "https://example.com"

Reactions

bash

# Like a cast
scripts/neynar.sh like 0x1234abcd
 
# Recast
scripts/neynar.sh recast 0x1234abcd

Follow/Unfollow

bash

scripts/neynar.sh follow dwr.eth
scripts/neynar.sh unfollow dwr.eth

API Reference

Endpoints Used

Action	Endpoint	Auth
User lookup	`GET /v2/farcaster/user/by_username`	API key
User by FID	`GET /v2/farcaster/user/bulk`	API key
User feed	`GET /v2/farcaster/feed/user/casts`	API key
Channel feed	`GET /v2/farcaster/feed/channels`	API key
Trending	`GET /v2/farcaster/feed/trending`	API key
Search casts	`GET /v2/farcaster/cast/search`	API key
Get cast	`GET /v2/farcaster/cast`	API key
Post cast	`POST /v2/farcaster/cast`	API key + Signer
React	`POST /v2/farcaster/reaction`	API key + Signer
Follow	`POST /v2/farcaster/user/follow`	API key + Signer

Response Format

All responses are JSON. The script extracts key fields for readability:

json

{
  "user": {
    "fid": 3,
    "username": "dwr.eth",
    "display_name": "Dan Romero",
    "follower_count": 450000,
    "following_count": 2800,
    "verified_addresses": ["0x..."]
  }
}

Common Patterns

Monitor a Channel

bash

# Get latest casts from /base channel
scripts/neynar.sh feed --channel base --limit 20

Find Active Users

bash

# Search for users by keyword
scripts/neynar.sh search-users "ethereum developer"

Cross-Post from Twitter

bash

# Post same content to Farcaster
scripts/neynar.sh post "gm, just shipped a new feature 🚀"

Reply to Mentions

bash

# Get your notifications (requires signer)
scripts/neynar.sh notifications
 
# Reply to specific cast
scripts/neynar.sh post "thanks!" --reply-to 0xabc123

Error Handling

Error	Cause	Fix
401 Unauthorized	Invalid API key	Check `config.json`
403 Forbidden	Signer required	Set up signer for write operations
404 Not Found	User/cast doesn't exist	Verify username/hash
429 Rate Limited	Too many requests	Wait and retry

Signer Setup

For write operations (posting, liking, following), you need a signer:

Go to dev.neynar.com
Create a new signer or use managed signer
Add signerUuid to your config

Managed signers are easiest — Neynar handles the key custody.

Rate Limits

Free tier: 300 requests/minute
Paid tiers: Higher limits available
Check X-RateLimit-Remaining header

Best Practices

Cache user lookups — FIDs don't change, usernames rarely do
Use channels — Better reach than random posting
Engage genuinely — Farcaster culture values authenticity
Batch requests — Use bulk endpoints when possible
Handle rate limits — Implement backoff

Resources

Neynar Docs: https://docs.neynar.com
API Reference: https://docs.neynar.com/reference
Developer Portal: https://dev.neynar.com
Farcaster Docs: https://docs.farcaster.xyz

Troubleshooting

API Key Not Working

bash

# Verify key works
curl -H "x-api-key: YOUR_KEY" \
  "https://api.neynar.com/v2/farcaster/user/bulk?fids=1"

Signer Issues

Ensure signer is approved and active
Check signer permissions match your FID
Managed signers are simpler than self-hosted

Cast Not Appearing

Casts propagate in seconds, but indexing may take longer
Check the cast hash in the response
Verify on warpcast.com directly

Security

Security scanPassed, 90 of 100Pattern checks on the skill's files.
Model reviewPassed

See the full security report

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Source

SKILL.md in the repositoryCheckingskills/neynar/SKILL.md

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