x402basequality 0.35

x402-gated premium API access on Base network, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/21

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific endpoint /api/v1/cards/21 is one of many API endpoints offered by this provider, all priced at $0.02 per request paid in USDC (USD Coin) with no API keys, rate limits, or commitments required.

The provider offers a broad catalog of endpoints spanning 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 use the same x402 payment model settled on the Base L2 network.

The specific functionality of /api/v1/cards/21 is not documented beyond the generic label "Premium API Access." The endpoint accepts POST requests and returns application/json. The x402 challenge confirms it is live and requires a payment of 20,000 base units of USDC (6 decimals), equaling $0.02 per call. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API data with per-request micropayments
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to various utility endpoints

Fit

Best for

  • —Agents needing instant API access without signup
  • —Developers testing x402 payment flows on Base
  • —Low-volume consumers who prefer per-call pricing over subscriptions

Not for

  • —Users needing detailed documentation or guaranteed SLAs
  • —High-volume use cases where per-request pricing becomes expensive
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/21 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/21
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what /api/v1/cards/21 actually returns, no request/response schema, and the crawled docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. The specific functionality is unknown.

Warnings

  • —No documentation available for the specific endpoint /api/v1/cards/21 — its actual functionality is unclear
  • —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content
  • —No OpenAPI schema or request/response examples available
  • —The label 'Premium API Access' is generic and does not describe what data or service is provided

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:51:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/s2crhH
x402-gated premium API access on Base network, pay $0.02 per request in USDC. — Clawmart · Clawmart