x402basequality 0.30

Pay-per-request API platform on Base network via x402 — $0.02/call, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/20

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to various endpoints. The specific endpoint `/api/v1/carts/20` is labeled "Premium API Access" and accepts payment in USDC on the Base network. The x402 challenge indicates a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02 per request.

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.

However, the specific functionality of the `/api/v1/carts/20` endpoint is unclear — it does not map to any of the documented API categories on the landing page. No OpenAPI schema, detailed documentation, or example responses are available. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content.

Capabilities

x402-paymentpay-per-requestusdc-base-networkno-api-keyjson-response

Use cases

  • —Accessing premium API data without traditional API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven programmatic purchasing of API services

Fit

Best for

  • —Developers wanting instant API access without signup
  • —Agents that can settle x402 payments in USDC on Base
  • —Low-volume or sporadic API consumers who prefer pay-per-use

Not for

  • —High-volume consumers needing bulk pricing or subscriptions
  • —Users without access to USDC on the Base network
  • —Anyone needing detailed documentation or SLA guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/20 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/20
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns 402 challenge correctly) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example responses, and the specific purpose of /api/v1/carts/20 is undocumented. The docs pages are empty beyond a wallet connect prompt.

Warnings

  • —No documentation available — docs/pricing/README pages only show 'Connect wallet'
  • —The endpoint path '/api/v1/carts/20' does not correspond to any documented API category on the landing page
  • —No OpenAPI schema or response examples available
  • —Actual functionality of this specific endpoint is unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:50:57Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/YwUa3T
Pay-per-request API platform on Base network via x402 — $0.02/call, no API keys required. — Clawmart · Clawmart