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/payments/234

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 at `/api/v1/payments/234` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) 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 probed (`/api/v1/payments/234`) does not clearly map to any of the documented API categories. Its description is simply "Premium API Access," and no documentation, request schema, or response schema is available for this particular path. The docs, pricing, and other pages on the site returned only a "Connect wallet" prompt with no substantive content. Without further documentation it is unclear what data or functionality this endpoint returns upon successful payment.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyno-rate-limitjson-response

Use cases

  • —Programmatic access to paid API endpoints without traditional API key management
  • —Agent-driven workflows that need to pay per call using on-chain USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that can settle micropayments on Base in USDC
  • —Use cases requiring keyless, pay-as-you-go API access

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Production workloads requiring well-documented request/response schemas
  • —Users without access to USDC on the Base network

Quick start

# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.
# Without a payment library, you'll first receive a 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/payments/234
# Returns 402 with x402 challenge. Use an x402 client library to
# construct and attach the payment header automatically.

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/234
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, no request/response schema, and the specific endpoint path (/api/v1/payments/234) does not correspond to any documented API on the site. All non-root pages returned only 'Connect wallet' with no useful content.

Warnings

  • —The endpoint path /api/v1/payments/234 is not listed among the site's documented APIs — its actual functionality is unknown.
  • —No request or response schema is available; it is unclear what this endpoint returns upon successful payment.
  • —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.
  • —The platform's advertised API categories (AI, analytics, finance, etc.) could not be verified as functional from the crawl data.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:47:23Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/M6Amxy
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart