Answers — AI Grounding

Paid Answers proxy via x402 pay-per-use (HTTP 402).

Prerequisites: This skill requires x402-payment. Complete the setup steps before first use.

Service URLs

Endpoint (Agent Interface)

POST /api/x402/answers

Payment Flow (x402 Protocol)

1. First request (no PAYMENT-SIGNATURE) -> 402 Payment Required with requirements JSON
2. Client signs (EIP-712) -> PAYMENT-SIGNATURE
3. Retry with PAYMENT-SIGNATURE -> Server settles and returns response

With @springmint/x402-payment or x402-sdk-go, payment is automatic.

When to Use

This endpoint (/res/v1/chat/completions) supports two modes:

• Single-search (default): Fast AI-grounded answer from a single search. Supports enable_citations.
• Research (enable_research=true): Multi-iteration deep research with progress events and synthesized cited answer.

Quick Start (cURL)

Blocking (Single-Search)

curl -X POST "https://www.cpbox.io/api/x402/answers" \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [{"role": "user", "content": "How does the James Webb Space Telescope work?"}],
    "model": "default",
    "stream": false
  }'

Streaming with Citations (Single-Search)

curl -X POST "https://www.cpbox.io/api/x402/answers" \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [{"role": "user", "content": "What are recent breakthroughs in fusion energy?"}],
    "model": "default",
    "stream": true,
    "enable_citations": true
  }'

Research Mode

curl -X POST "https://www.cpbox.io/api/x402/answers" \
  -H "Content-Type: application/json" \
  -d '{
    "messages": [{"role": "user", "content": "Compare quantum computing approaches"}],
    "model": "default",
    "stream": true,
    "enable_research": true,
    "research_maximum_number_of_iterations": 3,
    "research_maximum_number_of_seconds": 120
  }'

Using with x402-payment

CLI (AI Agent)

npx @springmint/x402-payment \
  --url https://www.cpbox.io/api/x402/answers \
  --method POST \
  --input '{"messages":[{"role":"user","content":"How does the James Webb Space Telescope work?"}],"model":"default","stream":false}'

Payload/Response

OpenAI-compatible chat.completions JSON + SSE streaming (pass-through).

Two Modes

Parameters

Standard Parameters

Research Parameters

Constraints (IMPORTANT)

Notes for Agent Usage

• Use x402-payment to handle the payment handshake automatically, especially for streaming (stream=true).

Response Format

Blocking Response (stream=false, single-search only)

Standard OpenAI-compatible JSON:

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "choices": [{"message": {"role": "assistant", "content": "The James Webb Space Telescope works by..."}, "index": 0, "finish_reason": "stop"}],
  "usage": {"prompt_tokens": 10, "completion_tokens": 50, "total_tokens": 60}
}

Streaming Response

SSE response with OpenAI-compatible chunks:

data: {"id":"chatcmpl-...","object":"chat.completion.chunk","choices":[{"delta":{"content":"Based on"},"index":0}]}

data: {"id":"chatcmpl-...","object":"chat.completion.chunk","choices":[{"delta":{"content":" recent research"},"index":0}]}

data: [DONE]

Streaming Tags by Mode

Single-Search (with enable_citations=true)

Research Mode

Usage Tag Format

The \x3Cusage> tag contains JSON-stringified cost and token data:

\x3Cusage>{"X-Request-Requests":1,"X-Request-Queries":8,"X-Request-Tokens-In":15000,"X-Request-Tokens-Out":2000,"X-Request-Requests-Cost":0.005,"X-Request-Queries-Cost":0.032,"X-Request-Tokens-In-Cost":0.075,"X-Request-Tokens-Out-Cost":0.01,"X-Request-Total-Cost":0.122}\x3C/usage>

Use Cases

• Chat interface integration: Use this endpoint to get a web-grounded answer payload in OpenAI-compatible format.
• Deep research / comprehensive topic research: Use research mode (enable_research=true) for complex questions needing multi-source synthesis (e.g., "Compare approaches to nuclear fusion").
• OpenAI SDK drop-in: Same SDK, same streaming format — just change base_url and api_key. Works with both sync and async clients.
• Cited answers: Enable enable_citations=true in single-search mode for inline citation tags, or use research mode which automatically includes citations in its answer.

Notes

• Timeout: Set client timeout to at least 30s for single-search, 300s (5 min) for research
• Single message: The messages array must contain exactly 1 user message
• Cost monitoring: Parse the \x3Cusage> tag from streaming responses to track costs