x402basequality 0.35

Pay-per-call API platform on Base (USDC) 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/357

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/357` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request.

The probed endpoint at `/api/v1/payments/357` returned a valid 402 challenge confirming it is live. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual request/response schemas for this specific endpoint are unknown. The endpoint accepts POST requests and returns `application/json`, but what data it provides or what input it expects is not documented in the crawled material.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API data with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need frictionless pay-per-call API access without credentials
  • —Users who want to avoid API key management and subscription commitments

Not for

  • —Users who need detailed API documentation or well-defined schemas before integrating
  • —High-volume use cases where per-request pricing may add up compared to subscription plans
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/357 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/357
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages render only "Connect wallet" with no schema, examples, or explanation of what this specific endpoint actually does. The generic name "Premium API Access" and the lack of input/output schema make it a stub-level listing.

Warnings

  • —No documentation available — all doc/pricing/API pages show only 'Connect wallet'
  • —No input or output schema provided for this endpoint; actual functionality is unknown
  • —The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned
  • —Cannot verify what this endpoint actually does beyond accepting a POST and returning JSON

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:06:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/S6P5jA
Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart