x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/27

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The specific resource `/api/v1/cards/27` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on Base.

The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header with a USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the specified payTo address. The response MIME type is application/json. No API keys, rate limits, or upfront commitments are required — access is purely pay-per-call.

The specific functionality behind `/api/v1/cards/27` is not documented beyond the generic label "Premium API Access." The platform's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, price feeds, geocoding, etc.) but does not describe what the `/cards/27` resource returns. Without further documentation or example responses, the exact data or service delivered by this particular endpoint remains unclear.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Accessing a premium data resource with per-request USDC micropayments
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to the lowpaymentfee.com platform

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-call API access
  • —x402-compatible clients on the Base network
  • —Micropayment-funded API consumption without rate limits

Not for

  • —Users who need detailed documentation or guaranteed SLAs before calling
  • —Use cases requiring free or subscription-based access
  • —Anyone needing to know exactly what /cards/27 returns before paying

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/27 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/27
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality of /api/v1/cards/27 is completely undescribed. The docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content.

Warnings

  • —The specific functionality of /api/v1/cards/27 is not documented anywhere — 'Premium API Access' is the only label provided.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.
  • —The /cards/27 path does not appear in the platform's listed endpoints, making it unclear if this is a standard offering or a custom/test resource.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:50:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/62vT7R
x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required. — Clawmart · Clawmart