x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/75

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/charges/75` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform offers endpoints across 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 are listed at the same $0.02/request price point.

However, the specific endpoint being listed here (`/api/v1/charges/75`) is labeled generically as "Premium API Access" and does not appear in the site's public endpoint catalog. There is no documentation describing what this particular endpoint returns, what input it expects, or what its output schema looks like. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content. As a result, the actual functionality behind this endpoint is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyhttp-post

Use cases

  • —Programmatic access to a pay-per-call API without needing API keys or subscriptions
  • —Agent-driven workflows that settle per-request payments in USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, on-demand API access settled in USDC
  • —Low-volume, pay-as-you-go API consumption

Not for

  • —Users who need detailed documentation or guaranteed SLAs
  • —Anyone requiring a well-documented, specific-purpose API — the actual response payload of this endpoint is undocumented

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/75 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/75
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific endpoint /api/v1/charges/75 is not listed in the site's public catalog, there is no documentation describing its input/output, and all doc pages rendered only 'Connect wallet' with no content. The actual functionality is unknown.

Warnings

  • —The endpoint /api/v1/charges/75 does not appear in the site's public API catalog — its purpose is unclear
  • —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content
  • —No input or output schema is documented for this endpoint
  • —The generic label 'Premium API Access' provides no indication of what the endpoint actually does

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:04:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/EHn8yk
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart