payment-ready until 2026-09-11
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.
VERDICT
ranking generation 3strong 94/100 #49 of 265 in Data by measured score
What the score read on this service: status online, 100% uptime 30d, 481ms response p95, x402 compliance 14 of 14, $0.01 price against the category. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
It is a score inside Data, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 265 listings, this one among them. That set is wider than the 265 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
ALTERNATIVES IN DATA
Other Data services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).
| SERVICE | BAND | SCORE | UPTIME 30D | VOL 30D |
|---|---|---|---|---|
| AgentFund US Economic, SEC & On-Chain Data | strong | 99 | 100% | --- |
| API Acre | strong | 99 | 99.7% | --- |
| ThirdMade Shelf | strong | 99 | 100% | --- |
| WebberSites x402 Data API | strong | 98 | 100% | --- |
| ForgeMesh Utility APIs | strong | 98 | 100% | --- |
5 of 264 other ranked services in Data · see the whole category
ASSESSMENT
updated 15m agoThe parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.
reliability 100%
- uptime 24h
- 100%
- uptime 7d
- 100%
- uptime 30d
- 100%
- uptime 90d
- 100%
- response p95
- 481ms
- avg response
- 254ms
- total checks
- 2,717
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 (p59 in Data)
- price (min)
- $0.01
- price (max)
- $0.10
- category percentile (min)
- p59 in Data
- category percentile (max)
- p73 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 ---
This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
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 30d 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
30d UPTIME 100%
RESPONSE TIME
AVG RESP 254ms
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)
This service settles on a network x402-list does not measure yet, so on-chain volume is not counted here. Shown as unmeasured, not zero.
DISTINCT BUYERS
This service settles on a network x402-list does not measure yet, so distinct on-chain buyers are not counted here. Shown as unmeasured, not zero.
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-07-20 · last up 2026-09-04
- 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 250ms
● OK 198ms
● OK 251ms
● SLOW 450ms
● SLOW 403ms
● OK 178ms
● OK 372ms
● OK 221ms
● OK 275ms
● OK 202ms
● OK 268ms
● OK 225ms
● OK 278ms
● OK 245ms
● OK 286ms
● OK 213ms
● OK 243ms
● SLOW 513ms
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>