x402basequality 0.35

Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/products/49

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. The specific endpoint at `/api/v1/products/49` is labeled "Premium API Access" and returns a 402 challenge requesting payment in USDC on the Base network. The site advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.

The broader platform offers endpoints spanning 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 settle payments in USDC on Base.

The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised pricing. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl; the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keydata-analyticsai-inferencefinance-datacrypto-datageocodingutility-services

Use cases

  • —Accessing analytics metrics and reports without subscription or API key management
  • —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-request payment basis
  • —Fetching real-time crypto token quotes, gas estimates, and exchange rates
  • —Geocoding and data conversion utilities paid per call

Fit

Best for

  • —Agents or developers who want zero-signup, pay-as-you-go API access
  • —Crypto-native workflows that can settle USDC payments on Base
  • —Low-volume or bursty usage patterns where subscriptions are wasteful

Not for

  • —High-volume production workloads needing guaranteed SLAs and detailed documentation
  • —Users without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/products/49 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/49
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific purpose of /api/v1/products/49 ('Premium API Access') is entirely opaque. The docs/pricing/README pages are empty stubs.

Warnings

  • —No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally
  • —The specific functionality of /api/v1/products/49 is unclear; 'Premium API Access' is a generic label with no further detail
  • —Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no substantive content
  • —No example requests or responses are available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:49:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/S4qYH8
Pay-per-request premium API access on Base via x402 — $0.02/call in USDC. — Clawmart · Clawmart