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Neynar Agents API

Operations for building AI agents

Neynar Agents API is one of 39 APIs that Neynar publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Agents. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, a getting-started guide, and rate-limit docs.

This API exposes 3 operations across 3 paths, and defines 61 schemas. It is described by OpenAPI 3.2.0, at version 3.176.0.

Requests are made against a single base URL, https://api.neynar.com.

3 operations 3 paths 61 schemas 2 GET1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
3.176.0
Base URL
https://api.neynar.com
Authentication
API Key
Contact
Resource Areas
1

Authentication & Security 1

Neynar Agents API declares 1 security scheme for authenticating requests. An API key is passed in the header as x-api-key (ApiKeyAuth). By default, every request must be authenticated.

  • ApiKeyAuth — API key to authorize requests

Paths & Operations 3

Across 3 paths, the API surfaces 3 operations — 2 GET, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Agents 3

Operations for building AI agents

GET
/v2/farcaster/cast/conversation/summary/
Cast conversation summary
lookup-cast-conversation-summary 3 params → 200400
POST
/v2/farcaster/frame/transaction/pay/
Create transaction pay mini app
create-transaction-pay-frame body → 200400401500
GET
/v2/farcaster/user/interactions/
User interactions
fetch-user-interactions 2 params → 200400

Schemas 61

The contract defines 61 schemas that model the data the API accepts and returns. The most detailed are HtmlMetadata (50 properties), Cast (22 properties), Channel (19 properties), User (18 properties). Each schema is shown below with its type and property counts.

FarcasterManifest
object
3 properties 1 required
TextRange
object
2 properties 2 required
Channel
object
19 properties 4 required
ReactionWithUserInfo
object
3 properties 3 required
Cast
object
22 properties 18 required
TransactionFrameLineItem
object
3 properties 2 required
TransactionFrame
object
CastId
object
[DEPRECATED: Use "cast" key instead]
2 properties 2 required
ReactionLike
object
2 properties 2 required
EmbedUrl
object
2 properties 1 required
TransactionFramePay
object
6 properties 6 required
ChannelMemberRole
string
The role of a channel member
ErrorRes
object
Details for the error response
4 properties 1 required
FrameActionButton
object
5 properties 2 required
VideoObject
object
4 properties 1 required
FrameV1
object
Mini app v1 object
9 properties 3 required
CastEmbedded
object
11 properties 10 required
EmbedCastDeep
object
2 properties 1 required
Location
object
Coordinates and place names for a location
4 properties 2 required
TransactionFrameConfig
object
3 properties 1 required
ChannelOrChannelDehydrated
object
Frame
CastViewerContext
object
Adds context on interactions the viewer has made with the cast.
2 properties 2 required
CastNotificationType
string
The notification type of a cast.
ConversationSummary
object
1 property 1 required
Follower
object
3 properties 2 required
UserViewerContext
object
Adds context on the viewer's follow relationship with the user.
4 properties 4 required
SolAddress
string
Solana address
ChannelUserContext
object
Adds context on the viewer's or author's role in the channel.
2 properties 1 required
FrameV2
object
Mini app v2 object
7 properties 3 required
ImageObject
object
5 properties 1 required
UserDehydrated
object
7 properties 2 required
EmbedDeep
EmbedUrlMetadata
object
7 properties 1 required
TransactionFrameDestination
object
4 properties 4 required
OembedRichData
object
Rich OEmbed data
14 properties 3 required
OembedPhotoData
object
Photo OEmbed data
14 properties 3 required
FramePayTransactionReqBody
object
3 properties 2 required
Fid
integer
The unique identifier of a farcaster user or app (unsigned integer)
EncodedJsonFarcasterSignature
object
Encoded JSON Farcaster signature
3 properties 3 required
TransactionFrameResponse
object
1 property 1 required
EmbedCast
object
2 properties 1 required
Notification
object
8 properties 4 required
ReactionRecast
object
2 properties 2 required
CastReactions
object
4 properties 4 required
CastDehydrated
object
4 properties 2 required
EthAddress
string
Ethereum address
TransactionFrameStatus
string
CastReplies
object
1 property 1 required
User
object
18 properties 12 required
LocationAddress
object
5 properties 2 required
Idem
string
An Idempotency key is a unique identifier for the request. Note: 1) This is used to prevent duplicate requests. Use the same idem key on retry attempts. 2) Thi…
HtmlMetadata
object
50 properties
TransactionFrameType
string
Type of transaction mini app
Embed
FrameButtonActionType
string
The action type of a mini app button. Action types "mint" & "link" are to be handled on the client side only and so they will produce a no/op for POST /farcast…
TransactionFrameAction
object
Action button for primary CTA on the transaction mini app
3 properties
ChannelDehydrated
object
5 properties 3 required
OembedVideoData
object
Video OEmbed data
14 properties 3 required
OembedLinkData
object
Link OEmbed data
11 properties 2 required
Network
string
A blockchain network e.g. "ethereum", "optimism", "base", "arbitrum"

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

neynar-agents-api-openapi.yml Raw ↑

Other APIs Neynar publishes across the network.

Neynar Action API
Neynar App Host API
Neynar AuthAddress API
Neynar Ban API
Neynar Block API
Neynar Cast API
Neynar Casts API
Neynar Channel API
Neynar Feed API
Neynar Fids API
Neynar fname API
Neynar Follows API
Where this information came from

This is an independent, third-party profile of Neynar Agents API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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