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/29

What it does

lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/29` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a valid payment proof and receive the response immediately.

The wider platform advertises four endpoint families: 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 probed here (`/api/v1/inbox/29`) does not clearly map to any of the advertised categories. Its description is simply "Premium API Access" with no further documentation on what it returns. There is no OpenAPI spec, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal "Connect wallet" page with no additional content. The endpoint is live and returns a well-formed x402 challenge, but the actual functionality behind this particular path is undocumented.

Capabilities

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

Use cases

  • —Agent-driven API consumption with automatic per-call USDC payments
  • —Accessing data, AI, or finance endpoints without managing API keys or subscriptions
  • —Programmatic pay-as-you-go access to utility services on Base

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-call API access
  • —x402-compatible clients that can settle USDC on Base
  • —Low-volume or bursty workloads where subscription pricing is wasteful

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who would benefit from bulk/subscription pricing
  • —Anyone unable to transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/29 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/29
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 spec, no request/response schema, and no documentation explaining what /api/v1/inbox/29 actually does. The crawled pages beyond the landing page are empty. The listing is effectively a stub with confirmed liveness and pricing.

Warnings

  • —The specific endpoint /api/v1/inbox/29 is not listed among the advertised API categories on the landing page — its actual functionality is unknown.
  • —No OpenAPI spec, request schema, or response examples are available.
  • —Documentation pages (/api, /pricing, /README) all resolve to a minimal 'Connect wallet' page with no useful content.
  • —Without knowing what this endpoint returns, callers risk paying $0.02 for an unknown response.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:46:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/eW8Yt2
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart