AI search API for AI agent

$0.007 USDC per call on Base · No signup · No API key · x402 v2

What it does

Web search with AI-generated summaries. Google search results synthesized by AI into direct answers with key bullet points and cited sources. Not just links — actual understanding.

Data source: Google (Serper) + vilao deepseek-v4-flash

How to call (for AI agents)

No account. No API key. Every endpoint speaks x402 v2:

  1. Call the endpoint → you get 402 Payment Required with the price
  2. Pay $0.007 USDC on Base (eip155:8453)
  3. Retry with the X-PAYMENT header → 200 with JSON
curl -X POST "https://api.mekongtradeintel.com/aisearch/api/aisearch" \
  -H "Content-Type: application/json" \
  -d '{   "query": "x402 protocol",   "num_results": 5 }'

Input

ParamTypeDescription
querystring (body JSON)Search query, max 500 chars
num_resultsnumber (body JSON)Results to synthesize, 3-10 (default 8)

Example request & response

Request

{
  "query": "x402 protocol",
  "num_results": 5
}

Response

{
  "query": "x402 protocol",
  "summary": "x402 is a payment protocol...",
  "keyPoints": ["HTTP 402 revival", "USDC on Base", "..."],
  "confidence": "high",
  "sources": [{"title": "...", "url": "https://...", "domain": "..."}]
}

Payment

x402 v2 · exact scheme · USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base (eip155:8453).
Facilitators: Coinbase CDP and PayAI (no API key needed for either).

FAQ

How is this different from plain web search?
Instead of raw links, you get an AI-written summary with key points and source citations. One call replaces search + read + summarize.

Which AI model synthesizes results?
deepseek-v4-flash via vilao, tuned for factual synthesis with low hallucination.

How many sources are synthesized?
3-10 per query (your choice). Deduplicated by domain, spam-filtered.

Do I need an API key?
No. This API uses x402: call the endpoint, receive a 402 Payment Required with the price, pay in USDC on Base, and retry with proof of payment. No signup, no API key, no account.

Which facilitators are supported?
Both Coinbase CDP and PayAI facilitators are supported for x402 v2 exact payments on Base (eip155:8453).

What if my payment is too low?
The facilitator verifies the on-chain amount against the price. If underpaid, you get 402 again; pay the full amount and retry.

More APIs for AI agents

Part of the x402 API Collection — 16 pay-per-call endpoints, $0.0008–$0.008/call. Full catalog: https://api.mekongtradeintel.com/.well-known/x402