Metered utilities · card or x402

The utility company for the machine web.

Small, precise web APIs, metered in credits (1 credit = $0.001). Humans buy credits with a card; agents pay per request with x402 (USDC on Base).

Browser

Render and capture the public web
Crypto

Hashes, keys, JWT, TOTP, AEAD
Credits

Prepaid bundles — card or USDC
System

Keys, registration, feedback

Get API key & credits Agent quickstart API docs

Card checkout · from $1 · GET /v1/meta · /skill.md

one request, paid on the wire 402 → 200

$ curl -X POST https://util.beauty/v1/browser/screenshot \
-d '{"url": "https://example.com"}'

HTTP/2 402 Payment Required
{ "error": { "code": "PAYMENT_REQUIRED", "details": {
"accepts": [{ "scheme": "exact", "maxAmountRequired": "3000", … }] } } }

$ curl … -H "X-PAYMENT: <proof>" # agent pays 3 credits ≈ $0.003

HTTP/2 200 OK
x-payment-response: { "transaction": "0x1b1c03…", "network": "base" }
{ "ok": true, "utility": "browser.screenshot", "chargedCredits": 3,
"artifact": { "url": "…/v1/artifacts/art_kx2…" } }

Payment terms are quoted in the response. Invalid requests are rejected before payment.

Rate card

Utilities, priced per call

1 credit = $0.001

Utility	What it does	Credits	≈ USD
browser.screenshot	Full-page website screenshot as PNG, JPEG, or WebP for AI agents — render a URL or HTML and capture.	3	$0.003
browser.pdf	HTML/URL to PDF rendering — print a public page or HTML string as A4/Letter PDF.	5	$0.005
browser.extract	Structured page content extraction: title, text, links, metadata, plus schema-guided fields (CSS selectors or JSON-LD/meta match) from a URL or HTML.	2	$0.002
browser.snapshot	Agent page snapshot: combined text, links, optional screenshot, and content hash in one call.	7	$0.007
browser.inspect	Debug view: HTTP status, console logs, network requests, and redirects.	4	$0.004
browser.markdown	Render a URL or HTML to clean GitHub-flavored Markdown for AI agents — default page-read format without screenshot/PDF weight.	3	$0.003
browser.a11y	Accessibility tree snapshot (roles, names, structure) for agent interaction planning — lighter than a screenshot, more structured than raw text.	3	$0.003
crypto.hash	Hash and checksum APIs: SHA-256, SHA-512, SHA-3, BLAKE2b/BLAKE3, MD5, CRC32.	1	$0.001
crypto.hmac	HMAC sign and verify message authentication codes (SHA-256, SHA-512, BLAKE2b).	1	$0.001
crypto.random	Secure random bytes, tokens, UUIDs, and passphrases.	1	$0.001
crypto.password	Password hash and verify with Argon2 (argon2id/argon2i, PHC format).	5	$0.005
crypto.signature	Ed25519 / ECDSA P-256 keypairs, digital signing, and signature verification.	2	$0.002
crypto.symmetric	Authenticated encryption (AEAD): AES-GCM and ChaCha20-Poly1305.	2	$0.002
crypto.jwt	Sign, verify, and decode JWT / JSON Web Tokens (HS256, RS256, EdDSA).	2	$0.002
crypto.totp	Generate and verify TOTP 2FA two-factor codes (RFC 6238).	1	$0.001
crypto.key_derivation	Key derivation with HKDF, Argon2id, or PBKDF2 from passwords or key material.	5	$0.005
net.dns	DNS lookup for A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, PTR records over DoH.	1	$0.001
net.rdap	WHOIS/RDAP domain or IP registration data (registrar, dates, nameservers).	1	$0.001
net.email	Email deliverability posture: SPF, DMARC, DKIM, MX, and MTA-STS for a domain.	2	$0.002
net.ip	IP intelligence: ASN, org, reverse DNS, geolocation country, and registry.	1	$0.001
net.cidr	Subnet calculator: CIDR ranges, host counts, membership tests, and IP conversions.	1	$0.001
net.certs	Certificate Transparency history via crt.sh (issued certs, issuers, SANs, validity).	2	$0.002
net.fetch	HTTP GET/HEAD of a public URL without a browser: status, headers, body (size-capped), redirects — for robots.txt, JSON APIs, and static files.	1	$0.001
net.url_expand	Unshorten and follow redirects for a public URL: final URL, status, and hop chain (SSRF-safe) — for phishing/marketing link inspection.	1	$0.001
net.tls	Live TLS reachability to a public host (DoH-pinned IP + SNI) plus Certificate Transparency cert summary (issuer, SANs, days-to-expiry).	2	$0.002
parse.pdf	Extract text from a PDF (public URL, base64, or util.beauty artifact) without a browser — page count, content hash, optional per-page text.	2	$0.002
system.suggest	Suggest a new utility, improvement, or docs change (agent feedback).	1	$0.001
system.register	Create a prepaid account and receive one API key (shown once).	1	$0.001
system.keys	List or rotate API keys for the registering wallet — x402-only auth (prepaid API keys cannot call this).	1	$0.001
credits.purchase	Buy a prepaid credit bundle (starter / builder / scale / pro) with volume discounts. Card: /credits · USDC catalog: /v1/credits/bundles.	SKU	$1–$70

Two ways to pay

x402 for agents. Credits for teams.

x402 pay-per-request

Live · Base · self-serve

The public path. Call any paid endpoint with no credentials and the response is HTTP 402 with machine-readable terms: price, asset, recipient, expiry, and replay rules. Sign a USDC transfer authorization, retry with proof, get your result. No signup, no key, no stored balance — and no gas for the payer.

·Settles real USDC on Base mainnet before your request runs
·Terms are bound to the exact request — proofs can’t be replayed
·Preview any price without a 402: GET /v1/x402/quote

Every settlement returns its on-chain transaction hash in the X-PAYMENT-RESPONSE header — on success and error responses alike. Start at /start.

Prepaid credits

Card · Stripe

For humans and teams. Pay with a card on /credits — Stripe Checkout, fixed bundles ($1–$70), then receive an API key once. Every call deducts its listed price from your balance.

·Card checkout via Stripe (no crypto wallet required)
·Authenticate with Authorization: Bearer or X-API-Key
·Full ledger + Idempotency-Key — retries can’t double-charge

Buy credits with card → Or USDC: POST /v1/credits/purchase

Invoice / volume? Contact us.

For machines, on purpose

Every capability is discoverable

An agent should never need to read a marketing page — this one included. The whole surface is self-describing: capabilities, prices, payment instructions, limits, and error semantics are all machine-readable, and every error carries a stable, enumerable code.

GET /v1/meta — utilities, pricing, payment modes, limits
GET /openapi.json — OpenAPI 3.1, the contract
GET /skill.md — installable Claude Code skill
GET /prompt.txt — paste into any agent harness
GET /llms.txt — orientation for language models
/start — wallet → first paid call

$ curl https://util.beauty/v1/meta

{
  "service": "util.beauty",
  "payment": {
    "modes": ["prepaid", "x402"],
    "creditUsdMicros": 1000
  },
  "utilities": [
    { "name": "browser.snapshot",
      "endpoint": "…/v1/browser/snapshot",
      "credits": 7, "usdMicros": 7000 },
    …
  ],
  "limits": { "maxTimeoutMs": 30000, … },
  "openapiUrl": "https://util.beauty/openapi.json"
}

Quickstart

Two paths. First paid call.

Humans · card

Pick a bundle, pay with Stripe, copy your API key once, call any utility.

Open /credits
Choose starter → pro ($1–$70)
Pay with card · key shown on success

Get credits →

Agents · x402

No signup. Discover → quote → pay USDC on Base in the same request lifecycle.

curl https://util.beauty/v1/meta
curl "https://util.beauty/v1/x402/quote?utility=crypto.hash"

Full agent recipe on /start →

Agents: install the skill with one curl, or paste /prompt.txt. Schemas live in the API reference.

The fine print

Honest metering. Prices are quoted up front, responses state the exact charge, and billing is per attempt: invalid requests are rejected free before payment, but executed requests are charged whether the target page cooperates or not.

Sensible limits. Renders time out at 30 seconds; request bodies up to 1 MiB; artifacts up to 25 MiB, retained for 7 days.

Public web only. Requests to private networks, loopback, and internal addresses are refused with URL_BLOCKED.

A utility, not a crawler. util.beauty renders pages you point it at. It does not evade access controls, and it identifies itself honestly.