Add Web Search to Your LLM / RAG Pipeline with a SERP API

Static RAG can’t answer “what happened this week.” Adding a live web-search step with a Google Search API grounds your LLM in current, citable sources. Here’s the pattern, using serp.cheap.

The architecture

user query
  → SERP API search (top N results)     ← live, fresh
  → fetch the result pages
  → chunk + embed on the fly
  → retrieve most relevant chunks
  → LLM answers, citing the source URLs

Step 1 — retrieve fresh sources

import requests

def web_sources(query, n=5, gl="us"):
    data = requests.post(
        "https://api.serp.cheap/v1/search",
        headers={"X-API-Key": "YOUR_KEY"},
        json={"q": query, "gl": gl},
        timeout=30,
    ).json()
    return [
        {"title": r["title"], "url": r["link"], "snippet": r.get("snippet", "")}
        for r in data["organic"][:n]
    ]

Step 2 — fetch and chunk

Fetch each url, extract main text, split into ~500-token chunks. (Use your existing loader/splitter — e.g. trafilatura + a text splitter.)

Step 3 — embed, retrieve, generate

Embed the chunks, retrieve the top-k for the query, and pass them to the model with an instruction to cite the source URLs. Because the sources came from the live SERP, the answer reflects what authoritative pages currently say.

Why a cheap SERP API matters here

RAG fans out a search on every query. At $0.0006 per fresh search (half cached), serp.cheap keeps per-answer retrieval cost negligible — and recurring identical queries hit the cache automatically.

Snippet-only fast path

For lightweight grounding you can skip fetching pages and feed the model the SERP titles + snippets directly — one API call, no crawling. It’s cheaper and often enough for quick factual answers.

Next

• Google Search API for AI agents
• Google Search API in Python

Try serp.cheap

Ground your RAG pipeline in the live SERP. 100 free searches on signup — no card required; pay-as-you-go from $0.75/1k after that, and credits stay valid for 12 months.

• Get your free API key →
• Prefer paying by card? serp.cheap is also on RapidAPI ($0.90/1k) and Apify ($1.50/1k).