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-28

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-28`) is listed as "Premium API Access" and accepts USDC payments on Base at a maximum cost of $0.02 per request (20,000 base units of USDC with 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, the specific endpoint `/api/endpoint-28` does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.

The x402 challenge confirms the endpoint is live, accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The payment scheme is "exact" with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keyhttp-post

Use cases

  • —Programmatic access to a premium API endpoint without needing API key registration
  • —Agent-driven workflows that pay per call using USDC on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —AI agents with Base USDC wallets needing on-demand API access
  • —Low-volume, pay-as-you-go API consumption without subscriptions

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume use cases where $0.02/request adds up significantly
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-28
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 there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/endpoint-28 is unknown — it doesn't match any named endpoint on the landing page. The docs/pricing/API pages are all empty beyond a wallet-connect prompt.

Warnings

  • —The endpoint path /api/endpoint-28 does not correspond to any named endpoint on the provider's landing page; its actual functionality is unknown.
  • —No OpenAPI schema, request/response examples, or meaningful documentation is available.
  • —Docs, pricing, and API pages render only 'Connect wallet' with no usable content.
  • —The exact behavior and output of this endpoint cannot be verified without making a paid request.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:06:33Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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