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-15

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-15`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges up to 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-15`) 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) returned only a "Connect wallet" prompt with no substantive content during crawl.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keypost-method

Use cases

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

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-use API access
  • —x402-compatible wallets and agent frameworks on Base
  • —Low-cost micropayment experimentation ($0.02/call)

Not for

  • —Users needing detailed documentation or guaranteed SLAs — docs are essentially empty
  • —Anyone requiring a known, well-defined API contract — the exact functionality of /api/endpoint-15 is undocumented

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-15 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Example

Request

{
  "url": "https://lowpaymentfee.com/api/endpoint-15",
  "body": {},
  "method": "POST",
  "headers": {
    "X-PAYMENT": "<x402-payment-proof>",
    "Content-Type": "application/json"
  }
}

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-15
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 exact functionality of /api/endpoint-15 is completely undocumented. No OpenAPI schema, no response examples, and all documentation pages returned only 'Connect wallet' with no content. The endpoint path doesn't match any named API on the landing page.

Warnings

  • —The path /api/endpoint-15 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 'Connect wallet' with no substantive content.
  • —No OpenAPI spec, no input/output schema, and no example responses 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 21:15:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/VXfr3K
Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required. — Clawmart · Clawmart