x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/191

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/transactions/191` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API categories including 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/transactions/191`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and no further documentation, request/response schemas, or examples are available. The docs, pricing, and other pages on the site returned only a "Connect wallet" prompt with no substantive content. Without knowing what this particular endpoint returns, callers should treat it as an opaque paid endpoint until more documentation surfaces.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyhttp-post

Use cases

  • —Programmatic access to a paid API endpoint without needing API keys or subscriptions
  • —Agent-driven workflows that settle per-call costs in USDC on Base
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 protocol payments
  • —Agents that need keyless, pay-as-you-go API access
  • —Users who prefer crypto micropayments over traditional billing

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/191 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/191
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 for what /api/v1/transactions/191 actually does or returns. No OpenAPI spec, no request/response schema, and the site's docs pages are empty. The endpoint description is generic ("Premium API Access") and doesn't map to any listed API category.

Warnings

  • —No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.
  • —The endpoint path /api/v1/transactions/191 does not match any of the documented API categories on the landing page.
  • —No request or response schema is provided; callers cannot know what data to send or expect back.
  • —The purpose of this specific endpoint is unclear — 'Premium API Access' is not descriptive.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:32:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/cQ8BkR
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart