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/nfts/4

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access. Instead of API keys or subscriptions, callers pay per request using USDC on the Base network. The specific endpoint `/api/v1/nfts/4` 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).

The broader platform advertises 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.

The `/api/v1/nfts/4` endpoint itself is not described in detail on the landing page — it does not appear in the listed API catalog. Its exact functionality is unclear; the description simply says "Premium API Access." The x402 challenge confirms it is live and accepts POST requests, settling payments in USDC (contract 0x8335…) on Base to address 0x1A2B…. The x402 version is 1 with a 300-second payment timeout.

Capabilities

x402-paymentusdc-on-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API data without managing API keys or subscriptions
  • —Agent-driven workflows that need on-demand paid endpoints settled in USDC on Base
  • —Programmatic access to analytics, AI inference, finance data, or utility services at micro-transaction pricing

Fit

Best for

  • —Developers or agents who want keyless, pay-as-you-go API access
  • —Users already holding USDC on Base who want frictionless micropayments
  • —Automated pipelines that need low-cost per-request billing without rate limits

Not for

  • —Users who need free or ad-supported API access
  • —High-volume consumers who would benefit from bulk/subscription pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/4 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/4
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 for what /api/v1/nfts/4 actually returns, no request/response schema, and the endpoint does not appear in the site's own catalog. The crawled docs and pricing pages returned only 'Connect wallet' with no useful content.

Warnings

  • —The /api/v1/nfts/4 endpoint is not listed in the site's own API catalog — its actual functionality is unknown.
  • —No request or response schema is available; the output of this endpoint cannot be verified without paying.
  • —Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.
  • —The broader platform lists many endpoints but none have detailed documentation visible in the crawl.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:37:58Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/rQrfsM
x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart