x402basequality 0.35

x402-gated API suite on Base: analytics, 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/13

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.

The specific endpoint `/api/v1/carts/13` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to the provider's wallet on Base. The timeout for payment is 300 seconds.

The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (/docs, /pricing, /api, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior, input/output schemas, and data sources behind these endpoints remain undocumented and unverifiable.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keyanalyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-datageocodingutility

Use cases

  • —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys
  • —Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment
  • —Running geocoding or data validation as a utility service with per-call billing
  • —Exporting analytics data or generating insights reports on a pay-as-you-go basis

Fit

Best for

  • —AI agents that need keyless, pay-per-call access to diverse utility endpoints
  • —Developers prototyping with low-cost, no-commitment API access on Base
  • —Web3-native applications that already hold USDC on Base

Not for

  • —High-volume production workloads needing guaranteed SLAs and detailed documentation
  • —Users without USDC on the Base network or unfamiliar with x402 payment flows

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/13 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/13
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation (all doc pages return only 'Connect wallet'), no example requests or responses, and the actual functionality behind /api/v1/carts/13 and the other listed endpoints is unverifiable. This is effectively a stub listing.

Warnings

  • —All documentation pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no usable content
  • —No OpenAPI or schema documentation available — endpoint input/output formats are unknown
  • —The specific endpoint /api/v1/carts/13 ('Premium API Access') is not listed among the advertised endpoints on the homepage, making its purpose unclear
  • —Actual data sources and model quality behind AI and finance endpoints are unverifiable

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:31:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/PC7Tjf
x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart