x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/28

What it does

lowpaymentfee.com offers a suite of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/28` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is paid individually via the X-PAYMENT header.

The broader lowpaymentfee.com platform advertises 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 are listed at the same $0.02/request price point. However, the specific endpoint `/api/v1/charges/28` does not clearly map to any of these named services — its description is simply "Premium API Access" with no further documentation on what data or functionality it returns.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually does beyond its generic title. The endpoint is confirmed live (returns a valid 402 x402 challenge), but without documentation it is unclear what payload to send or what response to expect.

Capabilities

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

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting keyless, pay-per-use API access settled in USDC on Base
  • —AI agents that can handle x402 payment challenges autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring high-volume calls where per-request pricing is inefficient
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/28
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. The listing is essentially a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
  • —The endpoint description 'Premium API Access' is generic and does not indicate what functionality or data is provided.
  • —No OpenAPI schema or request/response examples are available.
  • —No way to determine what POST body this endpoint expects or what it returns without trial and error.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:34:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/T9ZC9X
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart