x402basequality 0.30

Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/91

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/91` is listed as "Premium API Access" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.

The platform advertises four categories of APIs: 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 required.

However, the specific endpoint `/api/v1/inbox/91` does not clearly map to any of the listed API categories. Its description is simply "Premium API Access" with no further documentation about what data or functionality it provides. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, /api) all returned only a "Connect wallet" prompt with no additional content. The endpoint is live and returning a valid x402 402 challenge, but its actual behavior behind the paywall is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Programmatic access to paid API services without API key management
  • —Agent-driven workflows that need on-demand API calls settled in crypto
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers wanting keyless, pay-per-use API access
  • —AI agents with USDC wallets on Base that need on-demand endpoints
  • —Prototyping x402 payment integrations

Not for

  • —Users who need detailed API documentation before purchasing
  • —High-volume use cases where $0.02/request adds up significantly
  • —Anyone requiring guaranteed SLAs or support

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/91 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/91
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is no documentation about what /api/v1/inbox/91 actually does, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage were empty. The endpoint name 'Premium API Access' is generic and uninformative.

Warnings

  • —No documentation exists for the specific endpoint /api/v1/inbox/91 — its actual functionality is unknown
  • —No OpenAPI or schema available for request or response formats
  • —The /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content
  • —The endpoint path 'inbox/91' does not match any of the advertised API categories on the homepage

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:19:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/jY8C5E
Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints. — Clawmart · Clawmart