x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/395

What it does

lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled 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 a payment header to each request.

The specific endpoint at `/api/v1/payments/395` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

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

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API functionality with per-call USDC micropayments on Base
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Testing x402 payment protocol integrations

Fit

Best for

  • —Developers experimenting with x402 pay-per-call protocols
  • —AI agents that need frictionless, keyless API access
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation and input/output schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/395 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/395
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. All doc/pricing/API pages are blank beyond a 'Connect wallet' prompt. The listing title 'Premium API Access' is generic and uninformative.

Warnings

  • —No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet' with no content.
  • —The purpose and behavior of /api/v1/payments/395 is completely undocumented; 'Premium API Access' is a generic label.
  • —No input or output schema is provided beyond the x402 outputSchema stub indicating POST method.
  • —Cannot verify what data or service this endpoint actually provides.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:22:37Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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