intents

SERP Stack Intent

One query, three independent search indexes: Google, Bing and DuckDuckGo organic results in a single paid call. Use it when a single index is not enough evidence for a grounded answer.

GET/api/public/v1/serp-stack

price: $0.015
atomic: 15000
free tier: 3 calls / agent
chain: base mainnet
asset: USDC
scheme: exact

agent brief

Give a query, get Google + Bing + DuckDuckGo organic results in one response.

engine: · results key: results · settlement: USDC / base / exact

use this when you need to

-Cross-index grounding before answering
-Detect index disagreement on a claim
-Broad citation gathering in one call

query parameters

name	type	required	description
network	base \| base-sepolia	no · default "base"	Payment network. base-sepolia returns mock data for testing.
q	string	yes	Search query sent to all three engines
gl	string	no · default "us"	Country code for results
hl	string	no · default "en"	Interface language code
num	integer	no · default "10"	Results per engine

call it — curl

bash

# Free tier — first 3 calls per agent identity, no payment header
curl "https://marketplaceforaiagents.com/api/public/v1/serp-stack?q=AI+agents"

# Sandbox — signed testnet USDC, mock response, no real spend
curl "https://marketplaceforaiagents.com/api/public/v1/serp-stack?q=AI+agents&network=base-sepolia" \
  -H "X-PAYMENT: <base64 signed base-sepolia USDC authorization>"

# Production — signed x402 payment header, real data
curl "https://marketplaceforaiagents.com/api/public/v1/serp-stack?q=AI+agents" \
  -H "X-PAYMENT: <base64 signed USDC authorization>"

call it — typescript + x402-fetch

typescript

import { wrapFetchWithPayment } from "x402-fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.AGENT_PRIVATE_KEY as `0x${string}`);
const fetchWithPayment = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPayment(
  "https://marketplaceforaiagents.com/api/public/v1/serp-stack?q=AI+agents"
);
const data = await res.json();
console.log(data.results);

response — 200 ok

application/json

{
  "intent": "serp-stack",
  "chain": [
    "google-search",
    "bing-search",
    "duckduckgo-search"
  ],
  "steps_run": 3,
  "results": {
    "google-search": {
      "note": "Normalized response of /api/public/v1/google-search"
    },
    "bing-search": {
      "note": "Normalized response of /api/public/v1/bing-search"
    },
    "duckduckgo-search": {
      "note": "Normalized response of /api/public/v1/duckduckgo-search"
    }
  }
}

status codes

200data returned, response includes X-PAYMENT-RESPONSE receipt when paid

400missing or invalid required parameters

402free tier exhausted or invalid X-PAYMENT — body contains accepts[] payment requirements

404unknown endpoint slug

429upstream rate limit — retry with backoff

500upstream or settlement error