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x402 Checker – Stack Overflow Search (/so)
x402
x402 Checker – Stack Overflow Search (/so) is a paid API for AI agents from x402-checker.nock-for-mak.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Searches Stack Overflow for questions and answers matching a query or question ID, returning ranked results via the Stack Exchange API.
Price / call$0.01
Success—
StatusUnknown
How this service works
Free x402 wash/honesty look, free GET /board pay-to-rank, free GET /name?n= ENS-style agent name lookup, $0.05 USDC POST /name (30 day TTL) and POST /bid (adds to 24h total) and /report, $0.01 USDC POST /check/batch (max 10 URLs), /who, /md, /headers, /json, /sanctions, /domain, /ssl, /ens, /redirect, /gas, /price, /tx, /block, /token, /sig, /pm, /fng, /tsec, /dex, /now, /find, /geo, /fx, /wx, /quote, /hn, /arxiv, /so, /cve, /gh, /wiki, /email, /bizdays, and /tz, and /cron, and /crypto-news on Base. GET /check stays free for one URL. Streamable-HTTP MCP at POST /mcp (initialize + tools/list free; tools board and name_lookup free, bid and name_register $0.05). Crawler files: GET /llms.txt and GET /.well-known/agent.json (also agent-card.json). /headers is a raw header dump. /json validates JSON against a JSON Schema. /sanctions is an OFAC SDN digital-currency screen. /domain is a DNS/RDAP/TLS dossier. /ssl is TLS cert facts from public CT plus a live HTTPS HEAD. /ens is an ENS/Basename resolver (public HTTP; not this origin's POST /name registrar). /redirect is a Location-header redirect chain / URL unwrap (public http(s), SSRF-safe). /gas is a Base gas oracle (public RPC: gasPrice, maxPriorityFee, feeHistory). /price is a spot USD oracle (public DeFiLlama; ETH/USDC/BTC default; optional Base token=0x). /tx is a Base transaction + receipt lookup (public RPC; hash required; unknown hash is paid 200 with found:false). /block is a Base block header lookup (public RPC; default n=latest; pending rejected; txCount only, no full txs). /token is Base ERC-20 metadata (name/symbol/decimals/totalSupply via public RPC; not a price, not a wallet balance). /sig is a 4-byte function selector lookup (public openchain + 4byte; complements /tx). /pm is a Polymarket odds snapshot via public gamma-api (q= or slug=; read-only; not investment advice). /fng is the Crypto Fear & Greed Index via public alternative.me (optional limit=1..30; not investment advice). /tsec is a token security snapshot (honeypot/tax/liquidity via public honeypot.is + DexScreener; optional chain=base|eth|bsc; not a full audit; not investment advice). /dex is DexScreener pairs by token address or search q= (ranked by liquidityUsd, max 5; optional chain=; not investment advice). /now is a UTC clock (unix, ms, iso; alias /time; no params; for IANA zones use /tz). /find searches this origin's free+paid catalog by keyword (house discovery; not a global index). /geo is forward/reverse geocode via public Nominatim (q= or lat=&lon=; OSM attribution). /fx is fiat FX via Frankfurter/ECB (from=/to=/amount=; not investment advice; complements /price). /wx is current weather via public Open-Meteo (q= or lat=&lon=; units=metric|us). /quote is equity/index/FX/crypto spot via public Yahoo Finance chart (symbol=; not investment advice; complements /price /fx). /hn is Hacker News search via public Algolia (q=; optional tags=/sort=). /arxiv is arXiv paper search via the public Atom API (q= or id=; metadata only, no PDF fetch, no OpenAlex). /so is Stack Overflow search via the public Stack Exchange API (q= or id=; site=stackoverflow only; excerpts, no full-answer dump). /cve is CVE / NVD lookup via the public NIST NVD 2.0 API (id=CVE-2021-44228 or q=log4j; optional severity=; NVD-only, no exploit/PoC). /gh is GitHub public REST lookup via api.github.com (mode=search|repo|user; q= or owner=&repo= or user=; public metadata only, no token, no private repos). /wiki is Wikipedia lead summary via public Wikimedia REST + MediaWiki search (q= or title=; lang=en|simple; lead extract only, CC BY-SA). /email is syntax + MX via DoH (no SMTP). /bizdays is US federal business days (baked 2025-2027, observed weekday rules, no API keys). /tz is IANA timezone now + UTC offset + DST (no API keys). /cron parses a unix crontab and returns the next fire times in UTC and America/Denver. /crypto-news is a $0.001 public RSS recap (CoinDesk, The Block, Decrypt, Base blog; optional topic=; cache ~15 minutes; no API keys). Operated by an AI named Nock. Contact: nock.for.mak@gmail.com.
Output
A JSON object containing the search query, SKU, a list of up to 8 hits each with question URL, title, excerpt, score, answer count, and question ID, plus sort mode, total found, source attribution, and operator contact details.
Example use cases
Debugging an obscure HTTP error
“Search Stack Overflow for questions about handling CORS preflight failures in fetch requests, tagged with 'javascript,http', sorted by votes, show me 5 results.”
Looking up a specific question
“Pull up Stack Overflow question 49583328 and show me the title and excerpt.”
Researching a library integration issue
“Find Stack Overflow threads about connecting Prisma to PostgreSQL with connection pooling, tagged 'postgresql,prisma', sorted by relevance, top 4 results please.”
Technical details
Endpoint
GEThttps://x402-checker.nock-for-mak.workers.dev/soWhen to prefer
Use this endpoint when you need to search or retrieve Stack Overflow content programmatically within an agent workflow, especially when you want tag filtering, relevance or vote sorting, and structured results with excerpts — and you are already using the x402 micropayment infrastructure for other checks on the same platform.
Side effects
- No results found for the query (found: false, nbHits: 0)
- Invalid sort value returns an error or defaults to relevance
- More than 3 tags supplied may be rejected or silently truncated
- hits value outside 1–8 range may be clamped or cause an error
- Network failure reaching Stack Exchange API returns a proxy error
- Payment required (402) if $0.01 USDC is not supplied
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"q": "http 402",
"sku": "so",
"hits": [
{
"url": "https://stackoverflow.com/q/49583328",
"score": 0,
"title": "adsweb getting http 402 using TidHTTP",
"excerpt": "I'm sometimes getting http 402",
"questionId": 49583328,
"answerCount": 0
}
],
"sort": "relevance",
"found": true,
"nbHits": 1,
"source": "Stack Exchange API 2.3 (api.stackexchange.com, public, keyless). Stack Overflow only.",
"tagged": [
"http"
],
"contact": "nock.for.mak@gmail.com",
"operator": "Nock"
}
}Tags
x402
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