Fusion - Open-Weight Models
Fusion Model. Internal reviewers examine the conversation and available tool results, then a final model returns the next OpenAI-compatible response, including tool calls when tools are provided. Supports repeated multi-turn calls, client-executed tools, and JSON responses. Internal review notes are not returned.
SearchLiveeip155:8453Exactvia cdp
AiLlmAgenticFusionMulti-model
Calls · 30d
7
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 snapshots so far.
$1.77
Verified settled volume
190 settlements proven x402 by their on-chain EIP-3009 marker.
$0.049
Listed price
As published in the catalog. Always read the live 402 before paying.
7
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-20 12:12Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xdcdf184A64f6489Ec5304750a0AF157440115caEThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.049195USDC≈ $0.049195 USD
on Base · exact scheme
Pay 0.049195 USDC on Base to 0xdcdf…15caE. The signed payment is good for 10 minutes.
- Paid to
- 0xdcdf…15caE
- USD Coin contract
- 0x8335…02913
- Payment window
- 10 minutes
- As published
- 49195 smallest units
The catalog’s raw entry
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"version": "2"
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"payTo": "0xdcdf184A64f6489Ec5304750a0AF157440115caE",
"amount": "49195",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 600
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]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"model": "ai-open-models/fusion",
"stream": false,
"messages": [
{
"role": "user",
"content": "Review the available evidence and recommend the safest next action."
}
],
"max_tokens": 1024,
"temperature": 0.2
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"id": "chatcmpl-fusion-example",
"model": "ai-open-models/fusion",
"usage": {
"total_tokens": 282,
"prompt_tokens": 240,
"completion_tokens": 42
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Begin with a reversible canary deployment, verify the observed results against explicit success thresholds, and expand only after the rollback path has been tested."
},
"finish_reason": "stop"
}
],
"created": 0
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"messages"
],
"properties": {
"model": {
"type": "string",
"const": "ai-open-models/fusion",
"default": "ai-open-models/fusion",
"description": "Optional Fusion model alias. When omitted, the server uses ai-open-models/fusion."
},
"tools": {
"type": "array",
"items": {
"type": "object",
"required": [
"type",
"function"
],
"properties": {
"type": {
"type": "string",
"const": "function"
},
"function": {
"type": "object",
"required": [
"name",
"parameters"
],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"strict": {
"type": "boolean"
},
"parameters": {
"type": "object",
"additionalProperties": true
},
"description": {
"type": "string"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"minItems": 1,
"description": "Optional client-executed function definitions. Fusion may return tool calls, but this endpoint does not execute these functions."
},
"stream": {
"type": "boolean",
"const": false,
"default": false,
"description": "Streaming is not currently supported."
},
"messages": {
"type": "array",
"items": {
"type": "object",
"allOf": [
{
"if": {
"required": [
"role"
],
"properties": {
"role": {
"const": "system"
}
}
},
"then": {
"required": [
"content"
],
"properties": {
"content": {
"type": "string"
}
}
}
},
{
"if": {
"required": [
"role"
],
"properties": {
"role": {
"const": "user"
}
}
},
"then": {
"required": [
"content"
],
"properties": {
"content": {
"anyOf": [
{
"type": "string"
},
{
"type": "array",
"items": {
"type": "object",
"allOf": [
{
"if": {
"required": [
"type"
],
"properties": {
"type": {
"const": "text"
}
}
},
"then": {
"not": {
"required": [
"image_url"
]
},
"required": [
"text"
]
}
},
{
"if": {
"required": [
"type"
],
"properties": {
"type": {
"const": "image_url"
}
}
},
"then": {
"not": {
"required": [
"text"
]
},
"required": [
"image_url"
]
}
}
],
"required": [
"type"
],
"properties": {
"text": {
"type": "string"
},
"type": {
"enum": [
"text",
"image_url"
],
"type": "string"
},
"image_url": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"anyOf": [
{
"type": "string",
"pattern": "^https://",
"maxLength": 8192,
"minLength": 1
},
{
"type": "string",
"pattern": "^data:image/(png|jpeg|webp|gif);base64,[A-Za-z0-9+/]+={0,2}$",
"maxLength": 6990540,
"minLength": 1
}
],
"description": "Public HTTPS image URL or a base64 data URI containing a PNG, JPEG, WebP, or GIF image."
},
"detail": {
"enum": [
"auto",
"low",
"high"
],
"type": "string",
"description": "Requested image detail level. Availability and visual-token usage are provider-specific."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"minItems": 1
}
]
}
}
}
},
{
"if": {
"required": [
"role"
],
"properties": {
"role": {
"const": "assistant"
}
}
},
"then": {
"required": [
"content"
],
"properties": {
"content": {
"type": [
"string",
"null"
]
}
}
}
},
{
"if": {
"required": [
"role"
],
"properties": {
"role": {
"const": "tool"
}
}
},
"then": {
"required": [
"content",
"tool_call_id"
],
"properties": {
"content": {
"type": "string"
},
"tool_call_id": {
"type": "string",
"minLength": 1
}
}
}
}
],
"required": [
"role"
],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"role": {
"enum": [
"system",
"user",
"assistant",
"tool"
],
"type": "string"
},
"content": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
},
{
"type": "array",
"items": {
"type": "object",
"allOf": [
{
"if": {
"required": [
"type"
],
"properties": {
"type": {
"const": "text"
}
}
},
"then": {
"not": {
"required": [
"image_url"
]
},
"required": [
"text"
]
}
},
{
"if": {
"required": [
"type"
],
"properties": {
"type": {
"const": "image_url"
}
}
},
"then": {
"not": {
"required": [
"text"
]
},
"required": [
"image_url"
]
}
}
],
"required": [
"type"
],
"properties": {
"text": {
"type": "string"
},
"type": {
"enum": [
"text",
"image_url"
],
"type": "string"
},
"image_url": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"anyOf": [
{
"type": "string",
"pattern": "^https://",
"maxLength": 8192,
"minLength": 1
},
{
"type": "string",
"pattern": "^data:image/(png|jpeg|webp|gif);base64,[A-Za-z0-9+/]+={0,2}$",
"maxLength": 6990540,
"minLength": 1
}
],
"description": "Public HTTPS image URL or a base64 data URI containing a PNG, JPEG, WebP, or GIF image."
},
"detail": {
"enum": [
"auto",
"low",
"high"
],
"type": "string",
"description": "Requested image detail level. Availability and visual-token usage are provider-specific."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"minItems": 1
}
]
},
"tool_calls": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"type",
"function"
],
"properties": {
"id": {
"type": "string",
"minLength": 1
},
"type": {
"type": "string",
"const": "function"
},
"function": {
"type": "object",
"required": [
"name",
"arguments"
],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"arguments": {
"type": "string"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"minItems": 1
},
"tool_call_id": {
"type": "string",
"minLength": 1
},
"reasoning_content": {
"type": "string"
}
},
"additionalProperties": false
},
"minItems": 1,
"description": "Complete OpenAI-compatible conversation history for this turn. For multi-turn agent workflows, include earlier assistant tool calls and the corresponding client-executed tool results."
},
"max_tokens": {
"type": "integer",
"default": 8192,
"maximum": 131072,
"minimum": 1,
"description": "Maximum tokens for the final response. Internal review limits are managed by the service."
},
"temperature": {
"type": "number",
"maximum": 2,
"minimum": 0,
"description": "Optional sampling temperature for the final response."
},
"tool_choice": {
"anyOf": [
{
"enum": [
"none",
"auto",
"required"
],
"type": "string"
},
{
"type": "object",
"required": [
"type",
"function"
],
"properties": {
"type": {
"type": "string",
"const": "function"
},
"function": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string",
"minLength": 1
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
],
"description": "Optional tool-selection policy. On an initial tool-enabled turn, Fusion may select a tool before internal review. Submit the tool result in a later paid call for reviewed continuation."
},
"response_format": {
"type": "object",
"allOf": [
{
"if": {
"required": [
"type"
],
"properties": {
"type": {
"const": "json_schema"
}
}
},
"else": {
"not": {
"required": [
"json_schema"
]
}
},
"then": {
"required": [
"json_schema"
]
}
}
],
"required": [
"type"
],
"properties": {
"type": {
"enum": [
"text",
"json_object",
"json_schema"
],
"type": "string"
},
"json_schema": {
"type": "object",
"required": [
"name",
"schema"
],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"schema": {
"type": "object",
"additionalProperties": true
},
"strict": {
"type": "boolean"
},
"description": {
"type": "string"
}
},
"additionalProperties": false
}
},
"description": "Optional text or JSON response format for the final OpenAI-compatible response.",
"additionalProperties": false
},
"parallel_tool_calls": {
"type": "boolean",
"description": "Whether the final response may request multiple client-executed function calls."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"id",
"object",
"created",
"model",
"choices"
],
"properties": {
"id": {
"type": "string"
},
"model": {
"type": "string",
"const": "ai-open-models/fusion"
},
"usage": {
"type": "object",
"properties": {
"total_tokens": {
"type": "integer"
},
"prompt_tokens": {
"type": "integer"
},
"completion_tokens": {
"type": "integer"
}
}
},
"object": {
"type": "string",
"const": "chat.completion"
},
"choices": {
"type": "array",
"items": {
"type": "object",
"required": [
"index",
"message"
],
"properties": {
"index": {
"type": "integer"
},
"message": {
"type": "object",
"required": [
"role"
],
"properties": {
"role": {
"type": "string",
"const": "assistant"
},
"content": {
"type": [
"string",
"null"
],
"description": "Final assistant text. This may be null when Fusion requests client-side tool execution."
},
"tool_calls": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"type",
"function"
],
"properties": {
"id": {
"type": "string"
},
"type": {
"type": "string",
"const": "function"
},
"function": {
"type": "object",
"required": [
"name",
"arguments"
],
"properties": {
"name": {
"type": "string"
},
"arguments": {
"type": "string",
"description": "JSON-encoded arguments for the client-executed function."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"minItems": 1
}
}
},
"finish_reason": {
"type": [
"string",
"null"
]
}
}
},
"minItems": 1
},
"created": {
"type": "integer"
}
}
}
}
}
}
}
},
"builder-code": {
"info": {
"s": [
"cdp_sdk_server"
]
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"a": {
"type": "string",
"pattern": "^[a-z0-9_]{1,32}$",
"description": "App builder code"
},
"s": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[a-z0-9_]{1,32}$"
},
"maxItems": 11,
"description": "Service builder codes"
},
"w": {
"type": "string",
"pattern": "^[a-z0-9_]{1,32}$",
"description": "Wallet builder code"
}
},
"additionalProperties": false
}
},
"eip2612GasSponsoring": {},
"erc20ApprovalGasSponsoring": {}
}Provenance
- Seen in the source catalog
- 2026-10-20 12:12Z
- Last indexed by Roundhouse
- 2026-10-23 19:00Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 12:15Z
- x402 version
- 2
- Max timeout
- 600s
- Liveness probe
- HTTP 404
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Fusion - Open-Weight Models and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Fusion%20-%20Open-Weight%20Models' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.ai-open-models.com/v1/fusion/chat/completions, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.