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/40

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/carts/40` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's uniform pricing. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation is extremely thin — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There are no OpenAPI schemas, request/response examples, or descriptions of what each endpoint actually returns. The `/api/v1/carts/40` endpoint itself has a generic name ("Premium API Access") with no indication of what data or functionality it provides.

Capabilities

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

Use cases

  • —Accessing pay-per-request API services without needing an API key or subscription
  • —Making micropayment-gated API calls settled in USDC on Base
  • —Integrating x402-compatible endpoints into agent workflows

Fit

Best for

  • —Developers wanting zero-signup, pay-as-you-go API access
  • —AI agents with x402 payment capability on Base
  • —Users who prefer crypto micropayments over traditional API billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —Anyone requiring non-crypto payment methods
  • —Production workloads that need SLA guarantees or support

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/40 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/40
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint name 'Premium API Access' is completely generic with no indication of what it actually does. The docs/pricing/API pages are all blank beyond a wallet connect prompt.

Warnings

  • —The endpoint name 'Premium API Access' is generic — it is unclear what data or functionality /api/v1/carts/40 actually provides.
  • —No OpenAPI schema, request examples, or response examples are available anywhere on the site.
  • —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.
  • —The purpose and behavior of this specific endpoint cannot be determined from available information.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:49:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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