Fireworks AI Messages API is one of 10 APIs that Fireworks AI publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.
Tagged areas include Message. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, and an AsyncAPI specification.
This API exposes
1 operation
across 1 path,
and defines 62 schemas.
It is described by OpenAPI 3.1.0, at version 1.0.0.
Requests are made against a single base URL, https://api.fireworks.ai/inference.
1 operations1 paths62 schemas1 POST
Metadata
The identity and technical contract details declared by the specification.
Specification
OpenAPI 3.1.0
API Version
1.0.0
Base URL
https://api.fireworks.ai/inference/v1
Authentication
HTTP Bearer
Resource Areas
1
Authentication & Security 1
Fireworks AI Messages API declares
1 security scheme
for authenticating requests.
It accepts HTTP bearer tokens (API_KEY) (BearerAuth).
By default, every request must be authenticated.
BearerAuth — Bearer authentication using your Fireworks API key. Format: Bearer
Paths & Operations 1
Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.
Messages 1
POST
/v1/messages
Create a Message
messages_postbody→ 2004XX
Schemas 62
The contract defines 62 schemas that model the data the API accepts and returns. The most detailed are AnthropicCreateMessageParams (15 properties), AnthropicMessage (8 properties), AnthropicResponsePageLocationCitation (7 properties), AnthropicResponseCharLocationCitation (7 properties). Each schema is shown below with its type and property counts.
AnthropicRequestSearchResultLocationCitation
object
7 properties7 required
AnthropicResponsePageLocationCitation
object
7 properties7 required
AnthropicRequestContentBlockLocationCitation
object
6 properties6 required
AnthropicRequestWebSearchResultLocationCitation
object
5 properties5 required
AnthropicInvalidRequestError
object
2 properties2 required
AnthropicRequestPageLocationCitation
object
6 properties6 required
AnthropicTool
object
5 properties2 required
AnthropicRequestImageBlock
object
3 properties2 required
AnthropicInputContentBlock
AnthropicResponseToolUseBlock
object
4 properties4 required
AnthropicThinkingConfigAdaptive
object
Not supported yet.
1 property1 required
AnthropicThinkingConfigEnabled
object
2 properties2 required
AnthropicRequestCharLocationCitation
object
6 properties6 required
AnthropicBase64PDFSource
object
3 properties3 required
AnthropicEffortLevel
string
All possible effort levels.
AnthropicErrorResponse
object
3 properties3 required
AnthropicJsonOutputFormat
object
2 properties2 required
AnthropicResponseContentBlockLocationCitation
object
7 properties7 required
AnthropicPermissionError
object
2 properties2 required
AnthropicAPIError
object
2 properties2 required
AnthropicToolChoiceAuto
object
The model will automatically decide whether to use tools.
2 properties1 required
AnthropicToolChoiceNone
object
The model will not be allowed to use tools.
1 property1 required
AnthropicCacheControlEphemeral
object
2 properties1 required
AnthropicThinkingConfigDisabled
object
1 property1 required
AnthropicResponseSearchResultLocationCitation
object
7 properties7 required
AnthropicResponseRedactedThinkingBlock
object
2 properties2 required
AnthropicOverloadedError
object
2 properties2 required
AnthropicRateLimitError
object
2 properties2 required
AnthropicRequestCitationsConfig
object
1 property
AnthropicAuthenticationError
object
2 properties2 required
AnthropicMessage
object
8 properties7 required
AnthropicResponseTextBlock
object
3 properties3 required
AnthropicRawOutput
object
Fireworks extension that returns low-level details of what the model sees, including the formatted prompt and function calls.
6 properties3 required
AnthropicRequestToolUseBlock
object
5 properties4 required
AnthropicToolChoice
How the model should use the provided tools. The model can use a specific tool, any available tool, decide by itself, or not use tools at all.
AnthropicMetadata
object
1 property
AnthropicRequestDocumentBlock
object
6 properties2 required
AnthropicResponseCharLocationCitation
object
7 properties7 required
AnthropicInputMessage
object
2 properties2 required
AnthropicToolChoiceAny
object
The model will use any available tools.
2 properties1 required
AnthropicPlainTextSource
object
3 properties3 required
AnthropicContentBlockSource
object
2 properties2 required
AnthropicRequestRedactedThinkingBlock
object
2 properties2 required
AnthropicContentBlock
AnthropicGatewayTimeoutError
object
2 properties2 required
AnthropicBase64ImageSource
object
3 properties3 required
AnthropicRequestToolResultBlock
object
5 properties2 required
AnthropicNotFoundError
object
2 properties2 required
AnthropicResponseWebSearchResultLocationCitation
object
5 properties5 required
AnthropicCreateMessageParams
object
15 properties2 required
AnthropicRequestTextBlock
object
4 properties2 required
AnthropicModel
string
The model that will complete your prompt. See the [Fireworks Model Library](https://app.fireworks.ai/models) for available models.
AnthropicURLImageSource
object
2 properties2 required
AnthropicThinkingConfigParam
Configuration for enabling the model's extended thinking. When enabled, responses include thinking content blocks showing the model's thinking process before t…
AnthropicStopReason
string
AnthropicBillingError
object
2 properties2 required
AnthropicRequestThinkingBlock
object
3 properties3 required
AnthropicOutputConfig
object
2 properties
AnthropicInputSchema
object
3 properties1 required
AnthropicURLPDFSource
object
2 properties2 required
AnthropicToolChoiceTool
object
The model will use the specified tool with toolchoice.name.
3 properties2 required
AnthropicResponseThinkingBlock
object
3 properties3 required
Specification
The full machine-readable OpenAPI contract behind this narrative.
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