x402basequality 0.25

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/121

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/inbox/121` is listed as "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each call is paid individually via an X-PAYMENT header.

The broader platform advertises several 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 listed at $0.02 per request and settle payments in USDC on the Base L2 network.

However, the specific functionality of the `/api/v1/inbox/121` endpoint is unclear. The description is simply "Premium API Access" with no further documentation, input schema, or output schema available. The crawled docs pages (/api, /pricing, /README) all returned only a "Connect wallet" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque service until more documentation surfaces.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Programmatic access to a pay-per-request API without needing API keys or subscriptions
  • —Agent-driven workflows that settle per-call costs in USDC on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers exploring x402 payment-gated APIs
  • —Agents that can settle USDC payments on Base network
  • —Low-volume, on-demand API consumption without subscription overhead

Not for

  • —Users who need detailed documentation or guaranteed SLAs before calling
  • —High-volume batch processing where per-request fees add up quickly
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/121 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/121
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what /api/v1/inbox/121 actually does, no input/output schema, no examples, and the docs pages are empty. The listing is essentially a stub with only the x402 challenge metadata to go on.

Warnings

  • —No documentation available for the specific endpoint /api/v1/inbox/121 — its purpose and expected input/output are unknown
  • —All docs pages (/api, /pricing, /README) returned only 'Connect wallet' with no content
  • —No OpenAPI spec, no input schema, no output schema, and no example responses available
  • —The endpoint path 'inbox/121' suggests a resource-specific route but its semantics are undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:32:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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