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
- 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.
- 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.
- 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).
