Neynar Farcaster User Lookup by Username

x402

Neynar Farcaster User Lookup by Username is a paid API for AI agents from api.neynar.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Retrieves a Farcaster user's profile and account details by their username

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Complete Farcaster developer platform

Output

Returns a Farcaster user object containing the user's FID, username, display name, profile bio, follower and following counts, profile picture URL, custody address, and verified Ethereum wallet addresses.

Example use cases

Example prompt

“Can you look up the Farcaster profile for the username 'dwr' — I need their FID, bio, follower count, and any verified Ethereum addresses linked to their account?”

Technical details

Endpoint

GEThttps://api.neynar.com/v2/farcaster/user/by_username

When to prefer

Use this endpoint when you need to resolve a Farcaster handle to a full user profile, FID, or linked wallet addresses. Prefer this over searching by FID when you have a human-readable username as the starting point. Ideal for onboarding flows, social graph enrichment, or cross-referencing Farcaster identities with Ethereum addresses.

Side effects

Username not found — returns 404 with error message
Invalid or missing username parameter — returns 400 bad request
Payment not provided or insufficient — returns 402 payment required
Rate limit exceeded — returns 429 too many requests
Farcaster network unavailable — returns 503 service unavailable

Input

{
  "username": "dwr"
}

Output

{
  "user": {
    "fid": 3,
    "pro": {
      "status": "unsubscribed",
      "expires_at": "2026-06-16T17:21:25.000Z",
      "subscribed_at": "2025-06-16T17:21:25.000Z"
    },
    "url": "https://danromero.org",
    "score": 0.98,
    "object": "user",
    "pfp_url": "https://imagedelivery.net/BXluQx4ige9GuW0Ia56BHw/bc698287-5adc-4cc5-a503-de16963ed900/original",
    "profile": {
      "bio": {
        "text": "Interested in technology and other stuff."
      },
      "banner": {
        "url": "https://imagedelivery.net/BXluQx4ige9GuW0Ia56BHw/dab99f37-561b-4bd2-6d73-86f828a76d00/original"
      }
    },
    "username": "dwr",
    "display_name": "Dan Romero",
    "experimental": {
      "neynar_user_score": 0.98,
      "deprecation_notice": "The `neynar_user_score` field under `experimental` will be deprecated after June 1, 2025, as it will be formally promoted to a stable field named `score` within the user object."
    },
    "registered_at": "2023-11-07T19:42:51.000Z",
    "verifications": [
      "0xd7029bdea1c17493893aafe29aad69ef892b8ff2",
      "0x187c7b0393ebe86378128f2653d0930e33218899",
      "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5"
    ],
    "auth_addresses": [
      {
        "app": {
          "fid": 9152,
          "object": "user_dehydrated"
        },
        "address": "0x187c7b0393ebe86378128f2653d0930e33218899"
      }
    ],
    "follower_count": 630265,
    "custody_address": "0x6b0bda3f2ffed5efc83fa8c024acff1dd45793f1",
    "following_count": 77,
    "verified_accounts": [
      {
        "platform": "x",
        "username": "dwr"
      }
    ],
    "verified_addresses": {
      "primary": {
        "eth_address": "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5",
        "sol_address": "ExAqci8uUVKtqHqFW58fmwgMMY9PATfRGGyv6837j9Lx"
      },
      "eth_addresses": [
        "0xd7029bdea1c17493893aafe29aad69ef892b8ff2",
        "0x187c7b0393ebe86378128f2653d0930e33218899",
        "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5"
      ],
      "sol_addresses": [
        "ExAqci8uUVKtqHqFW58fmwgMMY9PATfRGGyv6837j9Lx"
      ]
    }
  }
}

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Technical details

Endpoint

GEThttps://api.neynar.com/v2/farcaster/user/by_username

When to prefer

Side effects

Username not found — returns 404 with error message
Invalid or missing username parameter — returns 400 bad request
Payment not provided or insufficient — returns 402 payment required
Rate limit exceeded — returns 429 too many requests
Farcaster network unavailable — returns 503 service unavailable

Input

{
  "username": "dwr"
}

Output

{
  "user": {
    "fid": 3,
    "pro": {
      "status": "unsubscribed",
      "expires_at": "2026-06-16T17:21:25.000Z",
      "subscribed_at": "2025-06-16T17:21:25.000Z"
    },
    "url": "https://danromero.org",
    "score": 0.98,
    "object": "user",
    "pfp_url": "https://imagedelivery.net/BXluQx4ige9GuW0Ia56BHw/bc698287-5adc-4cc5-a503-de16963ed900/original",
    "profile": {
      "bio": {
        "text": "Interested in technology and other stuff."
      },
      "banner": {
        "url": "https://imagedelivery.net/BXluQx4ige9GuW0Ia56BHw/dab99f37-561b-4bd2-6d73-86f828a76d00/original"
      }
    },
    "username": "dwr",
    "display_name": "Dan Romero",
    "experimental": {
      "neynar_user_score": 0.98,
      "deprecation_notice": "The `neynar_user_score` field under `experimental` will be deprecated after June 1, 2025, as it will be formally promoted to a stable field named `score` within the user object."
    },
    "registered_at": "2023-11-07T19:42:51.000Z",
    "verifications": [
      "0xd7029bdea1c17493893aafe29aad69ef892b8ff2",
      "0x187c7b0393ebe86378128f2653d0930e33218899",
      "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5"
    ],
    "auth_addresses": [
      {
        "app": {
          "fid": 9152,
          "object": "user_dehydrated"
        },
        "address": "0x187c7b0393ebe86378128f2653d0930e33218899"
      }
    ],
    "follower_count": 630265,
    "custody_address": "0x6b0bda3f2ffed5efc83fa8c024acff1dd45793f1",
    "following_count": 77,
    "verified_accounts": [
      {
        "platform": "x",
        "username": "dwr"
      }
    ],
    "verified_addresses": {
      "primary": {
        "eth_address": "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5",
        "sol_address": "ExAqci8uUVKtqHqFW58fmwgMMY9PATfRGGyv6837j9Lx"
      },
      "eth_addresses": [
        "0xd7029bdea1c17493893aafe29aad69ef892b8ff2",
        "0x187c7b0393ebe86378128f2653d0930e33218899",
        "0x6ce09ed5526de4afe4a981ad86d17b2f5c92fea5"
      ],
      "sol_addresses": [
        "ExAqci8uUVKtqHqFW58fmwgMMY9PATfRGGyv6837j9Lx"
      ]
    }
  }
}