x402basequality 0.35

x402-gated API marketplace on Base offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/74

What it does

lowpaymentfee.com is an x402-enabled API marketplace that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 payable per-request via the x402 protocol on the Base network using USDC.

The specific endpoint at `/api/v1/carts/74` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which has 6 decimals — so $0.02) per request. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through x402 payment headers.

Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/carts/74` endpoint actually returns. The site lists many endpoints but provides no detail on input parameters or output formats for any of them. The purpose of the `/carts/74` endpoint specifically is unclear and may be a generic or demo listing.

Capabilities

x402-paymentusdc-baseper-request-pricingdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingutility-apis

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments
  • —Geocoding and data validation as a utility service paid per-call on Base

Fit

Best for

  • —Developers wanting zero-signup, pay-per-request API access
  • —Agents that can settle x402 payments in USDC on Base
  • —Projects needing lightweight, no-commitment access to common API utilities

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone unable to transact USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/74 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/74
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of `/api/v1/carts/74` specifically is unclear. The site lists many endpoints but documents none of them.

Warnings

  • —No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'
  • —No OpenAPI or schema definition found for any endpoint
  • —The specific endpoint /api/v1/carts/74 has no description beyond 'Premium API Access' — its actual functionality is unknown
  • —No request or response examples available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:52:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/2bv4gt
x402-gated API marketplace on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart