x402basequality 0.40

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/products/20

What it does

lowpaymentfee.com is an x402-enabled API marketplace offering a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each endpoint costs $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/products/20` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform also exposes 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. Documentation pages (docs, pricing, README) appear to require wallet connection and contain no substantive content in the crawl, so the exact request/response schemas for this endpoint are unknown.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keydata-analyticsai-inferencefinance-dataweb3-datautility-services

Use cases

  • —Agents needing on-demand API access without managing API keys or subscriptions
  • —Programmatic access to analytics, AI inference, or financial data with per-call USDC payments
  • —Web3-native applications that want to pay for utility services (geocoding, validation, conversion) per request

Fit

Best for

  • —Developers and agents who want zero-setup, pay-as-you-go API access
  • —Use cases requiring low-cost ($0.02) individual API calls settled on Base
  • —Projects already holding USDC on Base that need diverse utility endpoints

Not for

  • —High-volume workloads where per-call pricing at $0.02 adds up significantly
  • —Users without USDC on Base or unfamiliar with x402 payment flows
  • —Applications requiring detailed SLAs, guaranteed uptime, or rate-limit guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/products/20 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/20
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The x402 challenge is live and confirms pricing and payment details. However, documentation pages are gated behind wallet connection and yield no content, so request/response schemas, detailed endpoint behavior, and the actual data returned by /api/v1/products/20 are entirely unknown.

Warnings

  • —Documentation, pricing, and README pages all require wallet connection and returned no useful content during crawl
  • —No OpenAPI spec or request/response schema available for this endpoint
  • —The exact purpose and output of /api/v1/products/20 ('Premium API Access') is unclear — it may be a generic product endpoint rather than a specific service
  • —No information on uptime guarantees, rate limits, or error handling

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:34:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/KAhL9R
Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required. — Clawmart · Clawmart