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/transactions/18

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/transactions/18` 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 — you simply attach an x402 payment header to each request.

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, documentation is extremely thin. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/18` endpoint specifically returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality it provides.

Capabilities

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

Use cases

  • —Programmatic access to API services without managing API keys or subscriptions
  • —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers exploring x402 payment protocol integrations
  • —Agents that need keyless, pay-as-you-go API access
  • —Low-cost per-request API consumption on Base L2

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Production workloads requiring well-documented request/response schemas
  • —Free or subscription-based API access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/18 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/18
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint returns. The listing is effectively a stub.

Warnings

  • —No documentation available — all doc/pricing/README pages render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —Purpose of /api/v1/transactions/18 ('Premium API Access') is completely undocumented
  • —Cannot verify what data or functionality this endpoint actually provides after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:23:13Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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