No accounts, no API keys
Payment travels with the HTTP request. There is nothing to sign up for and no key to rotate, leak, or revoke.
x402 API marketplace
2,000+ APIs to supercharge your agents for pennies.
live quoteHTTP 402
route
POST /v1/ai/summarizeprice$0.004
railsBase Sepolia + Solana Devnet
resultawaiting payment
HEXL is a marketplace of live HTTP APIs — finance, crypto, security, data, science, and 51+ more categories. Your code calls an endpoint, gets quoted a price, pays a fraction of a cent over open crypto rails, and gets the result. No accounts. No API keys. No subscriptions.
2,002live endpoints1,000+active users56categories$0.01minimum call
Get started in one command
curl -s "https://x402.hexl.dev/v1/catalog"GET /v1/finance/fx settled $0.001POST /v1/ai/summarize priced $0.004GET /v1/dev/npm-package/:name paid $0.002POST /v1/media/image-caption quoted $0.008GET /v1/finance/fx settled $0.001POST /v1/ai/summarize priced $0.004GET /v1/dev/npm-package/:name paid $0.002POST /v1/media/image-caption quoted $0.008
What is HEXL
One protocol between your code and 2,000+ APIs.
HEXL is a marketplace built on x402 — the open standard for paying for an HTTP request with the request itself. Instead of juggling keys, plans, and invoices for every provider, your agent or app calls an endpoint, gets quoted a price, pays a fraction of a cent, and gets the result. The same flow works for all 2,002 live endpoints.
Pay by the call, from a cent
Every route carries its own price. Settle per request instead of committing to a monthly plan you might not use.
Built for autonomous agents
A machine-readable catalog lets software find, price, and call the right endpoint without a human in the loop.
Composable by design
Small, single-purpose APIs become building blocks you can chain into larger workflows and products.
The catalog
Every kind of API, one storefront.
56 categories and 2,002 live endpoints — from FX rates and wallet screening to weather, CVEs, and research data. Here is a small slice.
Live FX, crypto spot prices, and macro-economic series.
On-chain risk: sanctions screening, honeypot and gas checks.
Threat intel agents can't compute themselves.
The everyday facts apps reach for, one call away.
Package, license, and repo intelligence for build pipelines.
Research-grade data from public scientific corpora.
Who it's for
One catalog. Three ways to ship faster.
AI agents & tool use
Give an agent a budget and a wallet instead of a folder full of API keys. It discovers the endpoint it needs, reads the price, pays, and moves on.
- Machine-readable catalog
- Per-call settlement
- No key management
Apps & prototypes
Ship a feature today without a sales call or a free-tier rate cap. Pay cents for the calls you actually make while you find product-market fit.
- No subscription minimums
- Transparent per-call pricing
- Live in one request
Data & automation
Wire fixed-price endpoints into cron jobs, pipelines, and back-office scripts. Costs scale with usage instead of a flat platform fee.
- Stable HTTP contracts
- Composable building blocks
- Usage-based cost
Start in under a minute
No SDK. No signup. Just curl.
The catalog is free and public, so you can explore the whole API surface before you spend a cent. When you call a paid route, you get a price back over HTTP 402 — pay it with any x402 client and the same request returns your result.
1 · List the catalog (free)
curl -s "$HEXL_API_URL/v1/catalog" | jq '.endpoints[0]'{ "slug": "finance-fx", "method": "GET", "path": "/v1/finance/fx", "price": { "display": "$0.01" } }
2 · Make your first call
curl -s "$HEXL_API_URL/v1/finance/fx?base=USD"e=EUR"{ "base": "USD", "quote": "EUR", "rate": 0.92, "date": "2026-05-31" }
Base URL https://x402.hexl.dev