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/125

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/125` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — 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.

This particular endpoint (`/api/v1/payments/125`) is confirmed live via a 402 challenge. However, the crawled documentation pages (docs, pricing, API, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this 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 available material.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-responsepost-method

Use cases

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

Fit

Best for

  • —Developers exploring x402 payment protocol integrations
  • —AI agents that need keyless, on-demand API access
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or OpenAPI schemas before integrating
  • —High-volume use cases where per-request pricing may add up compared to flat-rate plans
  • —Users without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/125 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/125
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, and all doc pages returned only 'Connect wallet' with no content. The purpose of this specific endpoint (/api/v1/payments/125) is unclear beyond the generic label 'Premium API Access'.

Warnings

  • —No OpenAPI or schema documentation available — request and response formats are unknown
  • —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content
  • —The specific function of /api/v1/payments/125 ('Premium API Access') is not explained anywhere in the crawled material
  • —The platform lists many endpoint categories but none have documented schemas or example payloads

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:32:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/u5X5kq
Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart