neynar

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1 scripts

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.

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Sourcebankrbot/skills
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NPX Install

npx skill4agent add bankrbot/skills neynar

Tags

Translated version includes tags in frontmatter
neynarfarcastersocial-protocolapi-integrationcli-tool

SKILL.md Content

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Neynar (Farcaster API)

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

Quick Start

Setup

  1. Get an API key from dev.neynar.com
  2. 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

ActionEndpointAuth
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

ErrorCauseFix
401 UnauthorizedInvalid API keyCheck 
config.json
403 ForbiddenSigner requiredSet up signer for write operations
404 Not FoundUser/cast doesn't existVerify username/hash
429 Rate LimitedToo many requestsWait and retry

Signer Setup

For write operations (posting, liking, following), you need a signer:
  1. Go to dev.neynar.com
  2. Create a new signer or use managed signer
  3. 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

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

Resources

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