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firstmention websearch
x402
firstmention websearch is a paid API for AI agents from api.firstmention.uk, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-31).
Search the web across curated sources (Hacker News, GitHub, Wikipedia, Stack Exchange) and return ranked results with snippets
Price / call$0.03
Success—
StatusUnknown
How this service works
Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.
Output
A JSON object containing: ok (boolean), query (echoed string), count (number of results returned), and a results array where each item has url, title, source (hn/github/wiki/se), snippet, and relevance score (0–1 float). Optionally returned as Markdown if format=md is requested.
Example use cases
Finding open source libraries
“Search GitHub and Stack Exchange for 'USDC stablecoin payment library' and show me the top 10 results — I want titles, URLs, and relevance scores.”
Researching a technical topic
“Can you search Hacker News and Wikipedia for 'autonomous AI agents' and return up to 8 results as markdown so I can quickly skim them?”
Competitive intelligence lookup
“Search for 'x402 pay-per-call API' across all sources and return the top 5 results so I can see what projects are talking about it.”
Technical details
Endpoint
GEThttps://api.firstmention.uk/s/websearch/brief?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs ranked web search results with snippets from developer-oriented sources (GitHub, Hacker News, Stack Exchange, Wikipedia) and can pay $0.03 per call via x402 USDC on Base. Prefer this over general web search APIs when the query is technical or developer-focused, when source filtering (e.g. GitHub-only) adds value, and when relevance scoring is needed. Not ideal for broad consumer news or real-time social media search.
Side effects
- Missing required query parameter 'q' returns a 400 error
- Limit value outside 1–20 range is rejected
- Invalid source string in 'sources' parameter may return empty results or error
- Payment not completed via x402/USDC causes 402 response before search executes
- Network issues reaching upstream sources may reduce result count or return ok:false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"count": 3,
"query": "x402 payments",
"results": [
{
"url": "https://github.com/coinbase/x402",
"title": "x402",
"source": "github",
"snippet": "An open protocol for payments on the web.",
"relevance": 0.92
}
]
}
}Tags
x402
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