x402basequality 0.35

Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/keys/68

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/keys/68` is listed as "Premium API Access" and costs up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.

The broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point and settle in USDC on Base.

This particular endpoint (`/api/v1/keys/68`) is labeled "Premium API Access" but its actual functionality is not documented beyond the title. The probe confirms it is live (returns a valid x402 402 challenge), accepts POST requests, and returns application/json. However, no OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The endpoint's concrete behavior — what data it returns or what input it expects — remains unclear.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, instant API access without subscriptions
  • —Programmatic access to paid endpoints without account registration

Fit

Best for

  • —Developers who want zero-friction, pay-as-you-go API access
  • —AI agents with x402-compatible wallets on Base
  • —Users who prefer crypto micropayments over traditional API key subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —Anyone without a Base-compatible USDC wallet
  • —High-volume consumers who need bulk pricing or rate-limit guarantees

Quick start

# Requires an x402-compatible client that can sign USDC payments on Base
curl -X POST https://lowpaymentfee.com/api/v1/keys/68 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/68
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what 'Premium API Access' actually does. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub listing.

Warnings

  • —No documentation found for the specific endpoint /api/v1/keys/68 — its actual functionality is unknown
  • —No OpenAPI or schema available; request and response formats are undocumented
  • —The /api, /pricing, and /README pages returned no meaningful content (just 'Connect wallet')
  • —The label 'Premium API Access' is generic and does not describe what the endpoint does

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:24:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/pE8Str
Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required. — Clawmart · Clawmart