x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/products/31

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.

The specific endpoint at `/api/v1/products/31` is listed as "Premium API Access" and returns `application/json`. The x402 challenge confirms it accepts the `exact` payment scheme on Base, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The timeout is 300 seconds.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual behavior, input schemas, and response formats for these endpoints are undocumented.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsedata-analyticsai-inferencefinance-datautility-services

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time crypto token quotes and gas estimates via micropayment
  • —Running geocoding or data validation calls on a per-request payment basis
  • —Exporting analytics data or generating insights reports with no subscription commitment

Fit

Best for

  • —Agents and bots that need frictionless, keyless API access via crypto micropayments
  • —Developers prototyping with low-cost, no-commitment API calls
  • —Web3-native applications already operating on the Base network

Not for

  • —Users who need detailed API documentation, input/output schemas, or SLA guarantees
  • —High-volume production workloads where $0.02/request adds up and bulk pricing is preferred
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/products/31 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/31
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documentation of request/response formats, and all doc pages are empty stubs. The specific endpoint '/api/v1/products/31' has only a generic 'Premium API Access' label with no indication of what it actually returns.

Warnings

  • —All documentation pages (/docs, /api, /pricing, /README) are empty — only showing 'Connect wallet'
  • —No OpenAPI or schema available; input parameters and response format for /api/v1/products/31 are completely unknown
  • —The endpoint name 'Premium API Access' is generic and does not describe actual functionality
  • —No examples, error codes, or rate limit information documented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:31:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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