x402basequality 0.35

x402-gated API suite on Base: analytics, 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/100

What it does

lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/cards/100` is listed as "Premium API Access" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.

The provider's landing page lists four categories of endpoints: 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 are priced uniformly at $0.02 per request.

The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 payment header using USDC on the Base L2 network. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed endpoint descriptions available beyond the landing page summary.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-sentimentai-summarizationai-classificationai-embeddingsfinance-pricesexchange-ratescrypto-gasgeocodingvalidationconversion

Use cases

  • —Querying real-time financial data (prices, exchange rates, gas estimates) without API key management
  • —Running AI inference tasks (sentiment analysis, text summarization, classification, embeddings) on a per-request payment basis
  • —Accessing utility services like geocoding, validation, and data conversion with minimal overhead
  • —Agents autonomously purchasing API calls using x402 USDC payments on Base

Fit

Best for

  • —AI agents that need on-demand API access without pre-registration
  • —Developers wanting pay-as-you-go access to diverse endpoints without subscriptions
  • —Low-volume or sporadic usage where per-request pricing is more economical than monthly plans

Not for

  • —High-volume production workloads where $0.02/request adds up significantly
  • —Users who need detailed API documentation, SDKs, or guaranteed SLAs
  • —Applications requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/100 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/100
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page. No request/response schemas, no examples, no OpenAPI spec. All doc pages return only 'Connect wallet'. The specific purpose of /api/v1/cards/100 is unclear — it could be anything. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content
  • —The specific purpose and expected input/output of /api/v1/cards/100 ('Premium API Access') is not documented anywhere
  • —No OpenAPI spec or request/response schema provided
  • —Cannot verify what data or functionality any of the listed endpoints actually return

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:45:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/QSZjhR