x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/71

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/carts/71` is listed as "Premium API Access" and returns a standard x402 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple 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 the same $0.02/request price point and settle via USDC on Base.

However, the specific endpoint probed here (`/api/v1/carts/71`) does not clearly map to any of the advertised API categories. Its description is simply "Premium API Access" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or example responses. The endpoint is live and responds with a valid x402 challenge, but the actual payload and use case remain unclear.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyjson-response

Use cases

  • —Accessing a premium API endpoint with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without API key management
  • —Testing x402 protocol payment flows against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, pay-per-call API access
  • —Low-volume consumers who want no subscription commitments

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where per-request pricing may add up without bulk discounts
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/71 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/71
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the specific endpoint's purpose ('Premium API Access' on a carts path) is unclear. The site's doc pages render only a wallet connect prompt with no usable content.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The endpoint path /api/v1/carts/71 does not match any of the advertised API categories on the landing page
  • —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content
  • —The actual response payload and data returned by this endpoint are unknown
  • —The 'carts' path suggests e-commerce cart data but no details are provided

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:17:01Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/az2DEg
Pay-per-request API platform on Base network via x402 — $0.02/call in USDC. — Clawmart · Clawmart