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/81

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/81` is listed as "Premium API Access" and accepts POST requests with payment via the x402 exact scheme. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.

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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.

However, the specific functionality behind the `/api/v1/carts/81` endpoint is unclear. The title "Premium API Access" is generic and does not describe what data or service is returned. The docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional documentation. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint on the platform.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpoint

Use cases

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

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before purchasing
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/81 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/81
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/carts/81 endpoint is entirely unclear. The docs/pricing/README pages are all blank beyond a wallet-connect prompt.

Warnings

  • —The specific functionality of /api/v1/carts/81 ('Premium API Access') is not documented anywhere — it is unclear what data or service this endpoint returns.
  • —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.
  • —No OpenAPI schema, no request body schema, and no response examples are available.
  • —The platform lists many endpoint categories (AI, finance, data, etc.) but none have visible documentation confirming they are functional.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:15:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/XpP9sr
Pay-per-request API platform on Base network via x402 — $0.02/call in USDC. — Clawmart · Clawmart