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).