x402basequality 0.35

Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/84

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network.

The specific endpoint at `/api/v1/carts/84` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/carts/84` endpoint actually returns. The site lists 16 different API endpoints but provides no detail on input parameters or response formats for any of them. The "Premium API Access" label on this specific cart endpoint does not clarify what data or service it provides.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datageocodingutility-apis

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
  • —Running utility operations like geocoding, validation, and data conversion with micropayments

Fit

Best for

  • —Agents or developers who want zero-commitment, pay-as-you-go API access
  • —Use cases requiring no API key signup or rate limit negotiation
  • —x402-compatible clients settling in USDC on Base

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before integrating
  • —High-volume production workloads where per-request pricing may be inefficient compared to subscription plans

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/84 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/84
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no clarity on what '/api/v1/carts/84' specifically returns. The docs pages are empty. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'
  • —The specific endpoint '/api/v1/carts/84' labeled 'Premium API Access' has no description of what data or service it provides
  • —No request body schema or response examples are documented anywhere
  • —The 16 listed endpoints have no documented input/output contracts

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:30:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/f5zzZ6
Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call. — Clawmart · Clawmart