x402basequality 0.30

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/18

What it does

lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/carts/18` is listed as "Premium API Access" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per call, settled on-chain to a designated wallet address. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform hosts 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 listed at the same $0.02/request price point.

Note that the specific `/api/v1/carts/18` endpoint's purpose is not clearly documented beyond the generic label "Premium API Access." The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or usage examples. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation about what this particular cart endpoint returns makes it difficult to assess its actual utility.

Capabilities

x402-paymentusdc-micropaymentbase-networkper-request-billingno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API data with per-call USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers or agents wanting keyless, pay-per-call API access
  • —Crypto-native applications that can settle USDC on Base
  • —Low-volume or sporadic API usage where subscriptions are wasteful

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/carts/18 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/carts/18
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but there is essentially no documentation about what /api/v1/carts/18 actually returns. No OpenAPI schema, no example responses, and all doc pages render only a wallet-connect prompt. The purpose of this specific endpoint is unclear beyond its generic label.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no technical content.
  • —The specific purpose and response format of /api/v1/carts/18 ('Premium API Access') is undocumented; it is unclear what data or service it provides.
  • —No OpenAPI or output schema beyond basic HTTP method metadata.
  • —The endpoint label 'Premium API Access' is generic and does not describe functionality.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:08:51Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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