x402basequality 0.30

Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/endpoint-52

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-52`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises endpoints across four 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, this particular endpoint path (`/api/endpoint-52`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.

Payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The endpoint accepts POST requests and returns `application/json`. Documentation pages (docs, pricing, README) all rendered only a "Connect wallet" prompt with no additional technical detail.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-keyhttp-post

Use cases

  • —Programmatic access to a premium API endpoint with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment flows
  • —AI agents that can settle USDC on Base for API calls
  • —Users who want no-signup, no-key API access

Not for

  • —Users who need detailed documentation or guaranteed SLAs
  • —Anyone without a Base-compatible USDC wallet
  • —Use cases requiring known, well-documented endpoint behavior (this endpoint's function is unspecified)

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-52 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Example

Request

{}

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-52
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/endpoint-52 is completely undocumented. No OpenAPI schema, no response examples, and all doc pages render only 'Connect wallet'. The endpoint path doesn't match any named API on the landing page.

Warnings

  • —The endpoint path /api/endpoint-52 does not match any of the named endpoints listed on the provider's landing page — its actual functionality is unknown.
  • —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no technical content.
  • —No OpenAPI spec, no request/response schema, and no usage examples are available.
  • —The provider site appears to be a generic x402 demo or template rather than a production service with well-defined APIs.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:03:10Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/JHuBKK
Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required. — Clawmart · Clawmart