payment-ready until 2026-08-20
imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed
Hacker News endpoint of the kadec0 API: top, new and best front page stories plus full text story search, returning title, score, comment count and author. The same host also serves other data and research endpoints.
Pay from $0.01 to $0.10 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
first settlement 2026-06-21 · $25.07 all-time · settled via coinbase
ASSESSMENT
updated 4h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 377ms
- avg response
- 258ms
- total checks
- 2,144
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.01 to $0.10 (p53 in Data)
- price (min)
- $0.01
- price (max)
- $0.10
- category percentile (min)
- p53 in Data
- category percentile (max)
- p77 in Data
- endpoints / prices
- 10 / 7
- model
- tiered
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
traction $15.945 30d · 14 buyers
- volume 30d
- $15.945
- buyers 30d
- 14
- settlements 30d
- 640
- first settlement
- 2026-06-21
- last settlement
- 2026-07-23
- top buyer share
- 72% of 30d volume
- trend 7d vs 30d
- 0.00x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $25.07
- settlements all-time
- 1,248
- median settlement 30d
- $0.02
- max settlement 30d
- $0.15
- settled via
- coinbase ($15.95, 640 tx)
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
WHAT IT DOES
ai-derivedA multi-purpose API providing access to various data sources including Hacker News, GitHub, geocoding, and website scraping.
- category
- multi-purpose-api
- in
- query params
AI-generated summary. The measured data is never altered by it.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| GET | /v1/geocode | $0.01 | Base | USDC | header | |
| GET | /v1/github | $0.02 | Base | USDC | header | |
| GET | /v1/hackernews | $0.01 | Base | USDC | header | |
| GET | /v1/paper-fulltext | $0.04 | Base | USDC | header | |
| GET | /v1/scrape | $0.03 | Base | USDC | header | |
| GET | /v1/sec-edgar | $0.05 | Base | USDC | header | |
| GET | /v1/serp-batch | $0.10 | Base | USDC | header | |
| GET | /v1/serp-multi | $0.05 | Base | USDC | header | |
| GET | /v1/serp-read | $0.08 | Base | USDC | header | |
| GET | /v1/website-audit | $0.08 | Base | USDC | header |
10 endpoints
REQUEST / RESPONSE EXAMPLE
An unpaid request to GET /v1/geocode returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
// request
curl -i 'https://api.kadec0.xyz/v1/geocode'
// 402 response (captured by monitor) · 10 payloads · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/hackernews",
"tags": [
"hackernews",
"tech-news",
"startup",
"developer",
"ycombinator"
],
"mimeType": "",
"description": "Hacker News feed. Top, new, and best front-page stories plus full-text story search — titles, scores, comment counts, and author for tech and startup news.",
"serviceName": "Hacker News Stories & Search"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "ai agents",
"mode": "search"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"url": "...",
"type": "hn_hit",
"title": "...",
"points": 420,
"numComments": 99
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "query (mode=search)"
},
"mode": {
"enum": [
"search",
"top",
"new",
"best"
],
"type": "string"
},
"maxItems": {
"type": "integer",
"default": 20
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "80000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/website-audit",
"tags": [
"seo",
"website-audit",
"performance",
"accessibility",
"meta-tags"
],
"mimeType": "",
"description": "Instant website SEO audit. On-page SEO, performance, and accessibility snapshot for any URL — title, meta tags, headings, links, image alt, load time, and an issues list with score.",
"serviceName": "Website SEO & Perf Audit"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"url": "https://example.com",
"type": "website_audit",
"score": 84,
"issues": [
"missing meta description"
]
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "page URL"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/sec-edgar",
"tags": [
"sec",
"edgar",
"financial-filings",
"stocks",
"finance"
],
"mimeType": "",
"description": "SEC EDGAR filing search. Full-text search of SEC filings (10-K, 10-Q, 8-K and more) by company, ticker, CIK, or keyword — company, form type, date, and document link.",
"serviceName": "SEC EDGAR Filing Search"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "artificial intelligence",
"type": "10-K"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"form": "10-K",
"type": "sec_filing",
"company": "APPLE INC",
"fileUrl": "https://www.sec.gov/Archives/edgar/data/320193/x/aapl.htm",
"filedAt": "2023-11-03",
"accessionNo": "0000320193-23-000106"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "full-text query"
},
"cik": {
"type": "string",
"description": "SEC CIK"
},
"type": {
"type": "string",
"description": "form type, e.g. 10-K|10-Q|8-K"
},
"company": {
"type": "string",
"description": "entity name"
},
"maxItems": {
"type": "integer",
"default": 20
},
"dateRange": {
"type": "string",
"description": "YYYY-MM-DD..YYYY-MM-DD"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "40000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/paper-fulltext",
"tags": [
"full-text",
"open-access",
"pdf-retrieval",
"paper-pdf",
"fulltext-api",
"ar5iv",
"europe-pmc",
"paper-sections"
],
"mimeType": "",
"description": "Full text and open-access PDF retrieval for a paper. Given an arXiv id, DOI, OpenAlex id, PMID, or PMCID, returns the readable body split into sections (introduction, methods, results) plus the open-access PDF location: arXiv via ar5iv, biomedical via Europe PMC, OA locations via OpenAlex for the rest. The 'now read it' call after a paper search. Keyless.",
"serviceName": "Paper Full Text & Open-Access PDF Retrieval"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"id": "1706.03762"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"text": "1 Introduction\nRecurrent neural networks...",
"type": "paper_fulltext",
"arxivId": "1706.03762",
"sections": [
{
"text": "Recurrent neural networks, long short-term memory...",
"heading": "1 Introduction"
}
],
"sourceUrl": "https://ar5iv.labs.arxiv.org/html/1706.03762",
"openAccess": true,
"fulltextSource": "ar5iv"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"id": {
"type": "string",
"description": "arXiv id, DOI, OpenAlex id, PMID, or PMCID"
},
"doi": {
"type": "string",
"description": "alias for id (DOI form)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/serp-batch",
"tags": [
"web-search",
"serp",
"batch-search",
"bulk",
"multi-query"
],
"mimeType": "",
"description": "Bulk web search. Run up to 5 search queries in a single call and get ranked title, URL, and snippet per query — with the same locale, freshness, and news filters as the single-query search. One paid call instead of five for research fan-out.",
"serviceName": "Bulk Web Search"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"queries": "python asyncio tutorial|rust tokio tutorial"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"type": "serp_batch",
"query": "python asyncio tutorial",
"results": [
{
"url": "https://example.com/asyncio",
"rank": 1,
"type": "search_result",
"title": "Async IO in Python",
"snippet": "A complete walkthrough..."
}
],
"resultCount": 10
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"queries"
],
"properties": {
"mode": {
"enum": [
"web",
"news"
],
"type": "string",
"default": "web"
},
"engine": {
"type": "string",
"default": "auto",
"description": "search backend: auto (recommended) or brave/yahoo/yandex (web); bing/yahoo (news)"
},
"region": {
"type": "string",
"default": "us-en",
"description": "locale, e.g. us-en, uk-en, de-de"
},
"queries": {
"type": "string",
"description": "up to 5 search queries separated by '|'"
},
"timelimit": {
"enum": [
"d",
"w",
"m",
"y"
],
"type": "string",
"description": "restrict to past day/week/month/year"
},
"safesearch": {
"enum": [
"on",
"moderate",
"off"
],
"type": "string",
"default": "moderate"
},
"num_results": {
"type": "integer",
"default": 10,
"description": "max results per query, cap 25"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/github",
"tags": [
"github",
"repository",
"open-source",
"developer",
"code"
],
"mimeType": "",
"description": "GitHub data. Repository stats, user profiles, and code-search results (stars, forks, language, topics, issues) via the GitHub REST API.",
"serviceName": "GitHub Repo & User Data"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"mode": "repo",
"repos": "microsoft/vscode"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"type": "repository",
"stars": 186000,
"fullName": "microsoft/vscode",
"language": "TypeScript"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "search query (mode=search)"
},
"mode": {
"enum": [
"repo",
"search",
"user"
],
"type": "string",
"description": "what to fetch"
},
"repos": {
"type": "string",
"description": "comma list of owner/name (mode=repo)"
},
"maxItems": {
"type": "integer",
"default": 30
},
"usernames": {
"type": "string",
"description": "comma list (mode=user)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/scrape",
"tags": [
"scrape",
"markdown",
"web-content",
"crawler",
"extraction"
],
"mimeType": "",
"description": "Web page to clean markdown. Converts any URL into LLM-ready markdown plus structured metadata — a keyless alternative to Firecrawl.",
"serviceName": "Web Page to Markdown"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"url": "https://example.com",
"type": "scrape",
"title": "Example",
"headings": [
{
"text": "Example",
"level": 1
}
],
"markdown": "# Example",
"wordCount": 42
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "page URL to scrape"
},
"maxChars": {
"type": "integer",
"default": 40000,
"description": "markdown cap"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/geocode",
"tags": [
"geocode",
"geocoding",
"lat-lng",
"address",
"coordinates"
],
"mimeType": "",
"description": "Geocoding and reverse geocoding. Converts an address or place name to latitude/longitude, or coordinates back to an address.",
"serviceName": "Geocoding & Reverse Geocode"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "1600 Amphitheatre Parkway, Mountain View, CA"
}
},
"output": {
"type": "json",
"example": {
"count": 1,
"items": [
{
"lat": 37.422,
"lon": -122.0841,
"type": "geocode",
"address": {
"city": "Mountain View",
"country": "United States"
},
"displayName": "Googleplex, Mountain View, CA, USA"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "address (forward geocode)"
},
"lat": {
"type": "number",
"description": "latitude (reverse geocode)"
},
"lon": {
"type": "number",
"description": "longitude (reverse geocode)"
},
"maxItems": {
"type": "integer",
"default": 5
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "80000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/serp-read",
"tags": [
"web-search",
"serp",
"answer-with-sources",
"web-reader",
"markdown",
"rag"
],
"mimeType": "",
"description": "Web search plus page reading in one call — answer with sources. Runs a web search, fetches the top results, and returns the ranked list together with each page's content as clean LLM-ready markdown, so an agent gets search results AND the underlying text without a second round of scraping calls. Per-page fetch errors are reported honestly per URL.",
"serviceName": "Web Search + Page Reader"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "how does x402 payment protocol work",
"fetch_top": "3"
}
},
"output": {
"type": "json",
"example": {
"count": 2,
"items": [
{
"type": "serp_read",
"query": "how does x402 payment protocol work",
"results": [
{
"url": "https://example.com/x402",
"rank": 1,
"type": "search_result",
"title": "x402 docs",
"snippet": "HTTP 402..."
}
],
"resultCount": 5
},
{
"url": "https://example.com/x402",
"rank": 1,
"type": "page_extract",
"title": "x402 docs",
"markdown": "# x402\nThe payment-required protocol...",
"wordCount": 900,
"httpStatus": 200,
"markdownTruncated": false
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "search query"
},
"mode": {
"enum": [
"web",
"news"
],
"type": "string",
"default": "web"
},
"engine": {
"type": "string",
"default": "auto",
"description": "search backend: auto (recommended) or brave/yahoo/yandex (web); bing/yahoo (news)"
},
"region": {
"type": "string",
"default": "us-en",
"description": "locale, e.g. us-en, uk-en, de-de"
},
"maxChars": {
"type": "integer",
"default": 8000,
"description": "max markdown chars per fetched page"
},
"fetch_top": {
"type": "integer",
"default": 3,
"description": "how many top results to fetch and extract, cap 5"
},
"timelimit": {
"enum": [
"d",
"w",
"m",
"y"
],
"type": "string",
"description": "restrict to past day/week/month/year"
},
"safesearch": {
"enum": [
"on",
"moderate",
"off"
],
"type": "string",
"default": "moderate"
},
"num_results": {
"type": "integer",
"default": 5,
"description": "ranked results to return, cap 25"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
},
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.kadec0.xyz/v1/serp-multi",
"tags": [
"web-search",
"serp",
"multi-engine",
"metasearch",
"brave",
"rank-fusion"
],
"mimeType": "",
"description": "Multi-engine metasearch. One query fanned out across 2-3 search engines (Brave, Yahoo, Yandex) with results deduplicated by URL and merged by reciprocal-rank fusion — consensus ranking across engines instead of one engine's bias, with per-engine rank attribution on every result.",
"serviceName": "Multi-Engine Web Search"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "best vector database 2026",
"engines": "brave,yahoo,yandex"
}
},
"output": {
"type": "json",
"example": {
"count": 2,
"items": [
{
"type": "serp_multi",
"query": "best vector database 2026",
"engines": [
{
"engine": "google",
"resultCount": 10
},
{
"engine": "brave",
"resultCount": 10
}
],
"mergedCount": 14
},
{
"url": "https://example.com/vectordb",
"rank": 1,
"type": "search_result",
"title": "Vector DB Comparison",
"engines": [
"google",
"brave"
],
"snippet": "A comparison of...",
"engineRanks": {
"brave": 3,
"google": 1
}
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"q",
"engines"
],
"properties": {
"q": {
"type": "string",
"description": "search query"
},
"mode": {
"enum": [
"web",
"news"
],
"type": "string",
"default": "web"
},
"region": {
"type": "string",
"default": "us-en",
"description": "locale, e.g. us-en, uk-en, de-de"
},
"engines": {
"type": "string",
"description": "comma list of 2-3 engines: brave, yahoo, yandex (web); bing, yahoo (news)"
},
"timelimit": {
"enum": [
"d",
"w",
"m",
"y"
],
"type": "string",
"description": "restrict to past day/week/month/year"
},
"safesearch": {
"enum": [
"on",
"moderate",
"off"
],
"type": "string",
"default": "moderate"
},
"num_results": {
"type": "integer",
"default": 10,
"description": "max results per engine, cap 25"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 24h selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/hacker-news-stories-search/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
UPTIME
24h UPTIME 100%
RESPONSE TIME
AVG RESP 257ms
PRICE (captured 402, USD)
Median across 10 endpoints. Use the selector to isolate one.
SUB-SCORES (uptime + x402 compliance)
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
PILLARS OVER TIME (measured)
price percentile in Data
site signals present (of 6)
Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.
VOLUME (on-chain settlement, USD)
DISTINCT BUYERS
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-07-20 · last up 2026-08-13
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
TIME STATUS RESP CAUSE
● OK 143ms
● OK 134ms
● OK 161ms
● OK 147ms
● OK 172ms
● OK 147ms
● OK 171ms
● OK 145ms
● OK 124ms
● OK 175ms
● OK 152ms
● OK 122ms
● OK 253ms
● OK 170ms
● OK 214ms
● OK 173ms
● OK 166ms
● OK 178ms
EMBED THIS BADGE
// HTML
<a href="https://x402-list.com/services/hacker-news-stories-search?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/hacker-news-stories-search.svg" alt="Hacker News Stories & Search listed on x402-list" height="28"> </a>
// Markdown
[](https://x402-list.com/services/hacker-news-stories-search?utm_source=badge&utm_medium=referral&utm_campaign=embed)
// HTML · live uptime variant
<a href="https://x402-list.com/services/hacker-news-stories-search?utm_source=badge&utm_medium=referral&utm_campaign=embed"> <img src="https://x402-list.com/badge/hacker-news-stories-search.svg?data=uptime" alt="Hacker News Stories & Search uptime on x402-list" height="28"> </a>