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/cards/24

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 `/api/v1/cards/24` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises four endpoint 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.

The `/api/v1/cards/24` endpoint itself does not have detailed documentation beyond its title. The crawled docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional content, so the actual request/response schema for this specific endpoint is unknown. The endpoint is confirmed live via a valid 402 challenge response.

Capabilities

x402-paymentusdc-micropaymentbase-networkper-request-pricingno-api-keyhttp-post

Use cases

  • —Accessing premium API data with per-call USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Programmatic access to data/analytics/AI/finance endpoints without subscriptions

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over traditional API key subscriptions

Not for

  • —Users who need detailed API documentation or OpenAPI schemas 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/cards/24 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/24
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs/pricing/API pages all render only a wallet-connect prompt. The purpose of `/api/v1/cards/24` specifically is entirely opaque beyond its generic title.

Warnings

  • —No documentation available for /api/v1/cards/24 — request body schema and response format are unknown
  • —All secondary pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content
  • —The specific function of the 'cards/24' endpoint is unclear; 'Premium API Access' is a generic label
  • —No OpenAPI spec or ai-plugin manifest discovered

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:46:14Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/cT2Sur
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart