Hexanon x402 APIs

Eight independently operated, pay-per-call HTTP APIs that an agent can call directly with USDC micropayments over x402 on Base — no accounts, no API keys. Probe any paid route unauthenticated to get a machine-readable HTTP 402 challenge, pay with an x402 client, and retry. Responses are only charged when the work succeeds (charged: true).

All endpoint guidance an agent needs is inlined below (snapshot: 2026-08-01). Each origin also publishes a machine-readable openapi.json as its reference spec if you need parameter details.

When to Use This Skill

• Vehicle / VIN due diligence for a US or Canada used car (decode, recalls, known issues, pre-purchase report) — Vindex, api.vindexapi.dev
• Finding market gaps and product-demand signals — what buyers want but can't find — Demandex, api.demandex.dev
• Polymarket intelligence: whale positioning, signals, resolving-soon markets, track records — OrcaTrace, api.orcatrace.dev
• Developer-ecosystem intelligence: trending GitHub repositories and momentum — gitBeacon, api.gitbeacon.dev
• Narrative and content intelligence: emerging narratives, pulse content, intelligence briefs — Signalis, api.signalis.dev
• Moltbook community intelligence: digests and a Viral Advisor that scores/rewrites posts — Moltalyzer, api.moltalyzer.xyz
• Checking whether an x402 API origin conforms to what x402scan, Bazaar and agent buyers require — x402lint, api.x402lint.dev
• Polymarket weather-market bucket-transition signals — Isocast, api.isocast.dev

Endpoints (snapshot 2026-08-01)

Every product exposes free sample/index routes, so an agent can preview response shapes before paying. Prices below are USDC on Base (eip155:8453); the live 402 challenge on each route is always the exact price at call time.

Vindex — vehicle & VIN intelligence (https://api.vindexapi.dev)

Method	Path	Price	What you get
GET	/v1/sample/decode	free	Sample VIN decode (fixed sample vehicle)
GET	/v1/decode?vin=	$0.01	Normalized NHTSA vPIC VIN decode
GET	/v1/recalls?vin=	$0.01	Merged US (NHTSA) + Canada (Transport Canada) recalls
GET	/v1/known-issues?vin=	$0.05	LLM-clustered named failure modes with verified ODI citations
GET	/v1/purchase-costs	$0.02	Itemized US + Canada used-vehicle closing costs (country=CA|US)
GET	/v1/prepurchase?vin=	$0.25	Whole-job pre-purchase report: decode + recalls + known issues + costs

Demandex — e-commerce demand signals (https://api.demandex.dev)

Method	Path	Price	What you get
GET	/v1/categories	free	Category index
GET	/v1/sample/opportunity	free	Sample opportunity card
GET	/v1/opportunities/trending	$0.01	Trending demand opportunities (teaser)
GET	/v1/opportunities?category=	$0.02	Opportunities in a category
GET	/v1/opportunity?id=	$0.05	Full opportunity card
POST	/v1/gauge	$0.03	Demand verdict for a product idea (cached corpus)
GET	/v1/brief	$0.25	Whole-job demand brief: trending + top opportunities + landscape

OrcaTrace — Polymarket whale intelligence (https://api.orcatrace.dev)

Method	Path	Price	What you get
GET	/v1/pulse	free	Top-3 movers brief
GET	/v1/track-record	free	Whale-calibration scorecard
GET	/v1/signal	$0.01	One Polymarket feed item
GET	/v1/resolving	$0.02	Markets resolving soon
GET	/v1/whales	$0.05	Whale calibration table
GET	/v1/digest	$0.10	Polymarket Intelligence Digest
GET	/v1/research?market=	$1.00	Single-market deep-dive research

gitBeacon — GitHub trending intelligence (https://api.gitbeacon.dev)

Method	Path	Price	What you get
GET	/v1/digests/latest	free	Latest GitHub digest
GET	/v1/repos	$0.01	Top trending repos
GET	/v1/digests	$0.05	Historical GitHub digests

Signalis — narrative intelligence (https://api.signalis.dev)

Method	Path	Price	What you get
GET	/v1/intelligence/latest	free	Latest Master Intelligence digest
GET	/v1/pulse/narratives	$0.01	Active AI-business narratives
GET	/v1/pulse/content/recent	$0.02	Raw recent content items
GET	/v1/intelligence/history	$0.03	Historical master digests

Moltalyzer — Moltbook community intelligence (https://api.moltalyzer.xyz)

Method	Path	Price	What you get
GET	/api/moltbook/digests/latest	free	Latest Moltbook digest
GET	/api/moltbook/digests	$0.02	Historical Moltbook digests
POST	/api/moltbook/advisor	$0.05	Viral Advisor: scores/rewrites a post

x402lint — x402 seller conformance (https://api.x402lint.dev)

Method	Path	Price	What you get
GET	/v1/checks	free	Full check catalog
GET	/v1/directory	free	Graded directory of scanned x402 origins
GET	/v1/status?url=	free	Scan freshness + grade summary for an origin
POST	/v1/scan	$0.15	Full 25-check conformance scan with A–F grade
GET	/v1/report?url=	$0.02	Cached full report

Isocast — Polymarket weather-market signals (https://api.isocast.dev)

Method	Path	Price	What you get
GET	/v1/cities	free	All active cities
GET	/v1/sample	free	Promo signal (shape demo)
GET	/v1/spot?city=	$0.01	Latest-signal snapshot for a city
POST	/v1/subscribe	$0.01–$7.00	Prepay the next N signals for a city (bundle)

How Payment Works

1. Probe a paid route unauthenticated — the API answers HTTP 402 with an accepts block naming the exact price, asset (USDC), network (Base) and pay-to address.
2. Pay and retry using a pinned x402 client library in your own code, e.g. @x402/fetch (npm install @x402/fetch @x402/evm viem at a pinned version and wrap fetch with your wallet signer). Avoid piping URLs through unpinned, runtime-installed CLI tools.
3. Wallet setup is a human step: fund a Base (eip155:8453) wallet with USDC and provision its key to your agent before enabling paid calls. Free routes need no wallet.

Example

User: "Decode this VIN and tell me about recalls."

Output:

1. GET https://api.vindexapi.dev/v1/decode?vin=<VIN>  -> HTTP 402 challenge
2. Pay via x402 client (USDC on Base) and retry -> normalized NHTSA vPIC decode
3. GET https://api.vindexapi.dev/v1/recalls?vin=<VIN> -> merged US (NHTSA) + Canada recalls

Tips

• Try the free sample/index routes first to see response shapes before spending anything.
• Prices in this document are a reviewed snapshot; the 402 challenge on each route is always the exact, current price — your x402 client sees it before paying, so a stale snapshot can never overcharge you.
• Each origin's openapi.json is its machine-readable reference spec for parameters and response schemas.
• Conformance or directory listing does not imply endorsement. These are eight separate APIs under the Hexanon family (hexanon.dev).