x402basequality 0.30

Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/39

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/39` is listed as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each POST request.

The wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing.

However, the specific `/api/v1/inbox/39` path does not clearly map to any of the named endpoints on the landing page. There is no OpenAPI schema, no request/response documentation, and no examples available from the crawl. The endpoint is confirmed live (returns a valid x402 402 challenge), but what it actually returns upon successful payment is unknown. Callers should treat this as an opaque premium endpoint until further documentation surfaces.

Capabilities

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

Use cases

  • —Programmatic access to premium API data without subscription or API key management
  • —Agent-driven workflows that need on-demand paid endpoints with crypto settlement
  • —Exploring x402 payment protocol integration for per-request billing

Fit

Best for

  • —Developers experimenting with x402 pay-per-call patterns
  • —AI agents that need keyless, instant API access on Base
  • —Low-volume consumers who prefer per-request pricing over subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who would benefit from bulk/subscription pricing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/39 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/39
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no request/response documentation, and the specific /api/v1/inbox/39 path is not described anywhere on the site. The purpose of this particular endpoint is entirely opaque.

Warnings

  • —The path /api/v1/inbox/39 does not correspond to any documented endpoint on the landing page — its actual functionality is unknown.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —No examples of successful responses exist in the crawl material.
  • —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:20:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/3pBFjG
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart