x402basequality 0.35

x402-gated API platform 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/67

What it does

lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/67` is listed as "Premium API Access" and requires a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call via the x402 exact payment scheme.

The platform advertises four categories of APIs: 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 required.

The specific `/api/v1/carts/67` endpoint accepts POST requests and returns `application/json`. However, the crawled documentation pages (docs, api, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. There is no OpenAPI spec or detailed documentation available to clarify what data this particular cart endpoint returns or what input it expects.

Capabilities

x402-paymentusdc-baseper-request-micropaymentjson-apipost-methodno-api-keyno-rate-limit

Use cases

  • —Accessing premium API data without subscription commitments
  • —Making per-request micropayments for AI inference or data analytics
  • —Paying for utility services like geocoding or validation on a per-call basis
  • —Integrating crypto-native pay-as-you-go APIs into agent workflows

Fit

Best for

  • —Developers wanting zero-commitment pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Projects needing low-cost micropayment-gated endpoints

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring high-throughput bulk access with negotiated pricing
  • —Developers without USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/67 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/67
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 wallet-connect prompt, and no information about what the /api/v1/carts/67 endpoint actually returns. The request and response schemas are completely unknown.

Warnings

  • —No OpenAPI specification or machine-readable schema available
  • —All documentation pages (docs, api, pricing, README) return only a 'Connect wallet' prompt with no content
  • —The specific purpose of /api/v1/carts/67 ('Premium API Access') is unclear — it does not match any of the advertised API categories
  • —Request and response body formats are entirely unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 22:23:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/9Sn8yT
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart