x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/carts/65

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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.

The specific endpoint at `/api/v1/carts/65` is listed as "Premium API Access" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.

Documentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The purpose of the `/api/v1/carts/65` endpoint specifically is unclear; the name "Premium API Access" and the cart-style URL suggest it may be a shopping cart or order resource rather than one of the advertised analytics/AI/finance endpoints. Without further documentation, the exact input parameters and response format cannot be determined.

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 data analytics queries (metrics, reports, insights) with micropayment settlement on Base
  • —Using utility services like geocoding, validation, and data conversion without subscriptions

Fit

Best for

  • —Agents and developers who want keyless, pay-per-use API access settled in USDC on Base
  • —Low-volume or bursty workloads where subscription pricing is wasteful
  • —Web3-native applications that already hold USDC on Base

Not for

  • —High-volume production workloads needing SLAs, rate-limit guarantees, or dedicated support
  • —Users without USDC on Base or unfamiliar with x402 payment flows
  • —Anyone needing detailed API documentation or guaranteed schema stability

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/65 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/65
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, documentation is effectively absent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/carts/65 is unclear. The listing is largely a stub.

Warnings

  • —No API documentation available; /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
  • —No OpenAPI or JSON schema provided for any endpoint
  • —The specific endpoint /api/v1/carts/65 ('Premium API Access') has an unclear purpose — 'carts/65' suggests a shopping cart resource rather than one of the advertised API categories
  • —Cannot verify that the advertised AI, analytics, finance, or utility endpoints actually function as described

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:33:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/dKj5gH
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC. — Clawmart · Clawmart