x402basequality 0.30

Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/26

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/26` is listed as "Premium API Access" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.

The broader platform advertises multiple API 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 endpoints are listed at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/inbox/26`) is labeled generically as "Premium API Access" and does not appear in the site's public API catalog, so its exact functionality is unclear.

Payments settle on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the "exact" scheme with a 300-second timeout. The endpoint is live and returning a proper 402 challenge.

Capabilities

x402-paymentusdc-basepay-per-requestpost-endpointno-api-keyno-rate-limit

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Testing x402 protocol integrations on Base network

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/26 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/26
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, no OpenAPI schema, no request/response examples, and the specific endpoint's functionality ('Premium API Access' at /api/v1/inbox/26) is not described anywhere on the site. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub listing.

Warnings

  • —The endpoint /api/v1/inbox/26 does not appear in the site's public API catalog — its actual functionality is unknown.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.
  • —The platform's advertised capabilities (AI, analytics, finance, etc.) cannot be verified for this specific endpoint.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:21:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/knM83W
Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments. — Clawmart · Clawmart