x402basequality 0.25

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/charges/274

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/274` 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 priced at $0.02 per request.

However, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/274` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" actually provides.

Capabilities

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

Use cases

  • —Programmatic access to a pay-per-call API without needing API key registration
  • —Agent-driven workflows that settle per-request via USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless, pay-as-you-go API access
  • —Low-volume consumers who want no subscription commitment

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume production workloads where per-request pricing is cost-prohibitive compared to bulk plans
  • —Anyone who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/274 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/274
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty ('Connect wallet' only). The specific functionality of '/api/v1/charges/274' ('Premium API Access') is completely undocumented, making this effectively a stub listing.

Warnings

  • —No documentation available — all doc pages render only 'Connect wallet' with no content
  • —No OpenAPI or schema describing request parameters or response format
  • —The specific purpose of /api/v1/charges/274 ('Premium API Access') is undocumented and unclear
  • —No request or response examples available anywhere in crawled content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:37:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/t2bV8q
Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required. — Clawmart · Clawmart