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Echo Router Chat Completions
x402
Echo Router Chat Completions is a paid API for AI agents from echo-staging.up.railway.app, paid per call via x402, price unknown, status unknown (last checked 2026-09-13).
Generates conversational AI responses using various language models with support for streaming, function calling, and multi-turn conversations
Price / call—
Success0%
StatusUnknown
How this service works
Generates conversational AI responses using various language models. Supports streaming, function calling, and multi-turn conversations with customizable parameters.
Output
Returns a chat.completion object with an array of choices, each containing the assistant's message (role + content), finish reason, and optional function_call or tool_calls. Also includes token usage stats (prompt_tokens, completion_tokens, total_tokens) and the model used.
Example use cases
Example prompt
“Chat with the Echo Router using gpt-4o — send this multi-turn conversation: system says 'You are a helpful assistant', user asks 'What is the capital of France?', stream the response back, and keep max_tokens at 256 with temperature 0.7.”
Technical details
Endpoint
POSThttps://echo-staging.up.railway.app/chat/completionsWhen to prefer
Choose this endpoint when you need OpenAI-compatible chat completions with multi-turn conversation support, function/tool calling, and streaming via an x402-gated API. Ideal for agents that need to chain LLM calls programmatically without managing their own model infrastructure, especially when paying per-call with crypto micropayments.
Side effects
- Invalid or unsupported model name returns an error
- Malformed messages array (missing role or content) causes a 400 error
- Exceeding max_tokens limit for the selected model results in truncation or error
- Streaming failures may cause partial response delivery
- Function definitions with invalid JSON schema may be rejected
- Rate limiting or quota exhaustion on the staging environment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| n | number | |
| stop | string | |
| model | string | |
| top_p | number | |
| stream | boolean | |
| messages | array | |
| functions | array | |
| logit_bias | object | |
| max_tokens | number | |
| temperature | number | |
| function_call | string | |
| response_format | string | |
| presence_penalty | number | |
| frequency_penalty | number |
Output
Schema · Response
{
"id": {
"type": "string"
},
"model": {
"type": "string"
},
"usage": {
"type": "object",
"required": [
"prompt_tokens",
"completion_tokens",
"total_tokens"
],
"properties": {
"total_tokens": {
"type": "number"
},
"prompt_tokens": {
"type": "number"
},
"completion_tokens": {
"type": "number"
},
"completion_tokens_details": {
"type": "object",
"properties": {
"reasoning_tokens": {
"type": "number"
},
"accepted_prediction_tokens": {
"type": "number"
},
"rejected_prediction_tokens": {
"type": "number"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"object": {
"enum": [
"chat.completion"
],
"type": "string"
},
"choices": {
"type": "array",
"items": {
"type": "object",
"required": [
"index",
"message",
"finish_reason"
],
"properties": {
"index": {
"type": "number"
},
"message": {
"type": "object",
"required": [
"role",
"content"
],
"properties": {
"name": {
"type": "string"
},
"role": {
"enum": [
"system",
"user",
"assistant",
"function"
],
"type": "string"
},
"content": {
"anyOf": [
{
"type": "string"
},
{
"type": "array",
"items": {
"type": "object",
"required": [
"type"
],
"properties": {
"text": {
"type": "string"
},
"type": {
"type": "string"
}
},
"additionalProperties": false
}
}
],
"nullable": true
},
"tool_calls": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"type",
"function"
],
"properties": {
"id": {
"type": "string"
},
"type": {
"enum": [
"function"
],
"type": "string"
},
"function": {
"type": "object",
"required": [
"name",
"arguments"
],
"properties": {
"name": {
"type": "string"
},
"arguments": {
"type": "string"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
},
"function_call": {
"type": "object",
"required": [
"name",
"arguments"
],
"properties": {
"name": {
"type": "string"
},
"arguments": {
"type": "string"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"logprobs": {
"type": "object",
"nullable": true,
"required": [
"content"
],
"properties": {
"content": {
"type": "array",
"items": {
"type": "object",
"required": [
"token",
"logprob",
"bytes"
],
"properties": {
"bytes": {
"type": "array",
"items": {
"type": "number"
},
"nullable": true
},
"token": {
"type": "string"
},
"logprob": {
"type": "number"
},
"top_logprobs": {
"type": "array",
"items": {
"type": "object",
"required": [
"token",
"logprob",
"bytes"
],
"properties": {
"bytes": {
"type": "array",
"items": {
"type": "number"
},
"nullable": true
},
"token": {
"type": "string"
},
"logprob": {
"type": "number"
}
},
"additionalProperties": false
}
}
},
"additionalProperties": false
},
"nullable": true
}
},
"additionalProperties": false
},
"finish_reason": {
"enum": [
"stop",
"length",
"tool_calls",
"content_filter",
"function_call"
],
"type": "string",
"nullable": true
}
},
"additionalProperties": false
}
},
"created": {
"type": "number"
},
"system_fingerprint": {
"type": "string",
"nullable": true
}
}Tags
x402
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