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/280

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/280` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform offers 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 endpoints are priced at $0.02 per request.

This particular endpoint (`/api/v1/transactions/280`) is labeled "Premium API Access" but no further documentation describes what data or functionality it returns. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. Without additional documentation or example responses, the exact behavior of this endpoint remains unclear.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Programmatic access to premium API data with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless pay-per-use API access
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume use cases where per-request pricing may add up
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/280 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/280
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no example request/response, and all documentation pages render only 'Connect wallet' with no substantive content. The purpose of this specific endpoint (/api/v1/transactions/280) is undocumented beyond the label 'Premium API Access'.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —The exact functionality of /api/v1/transactions/280 is unknown; 'Premium API Access' is the only description
  • —No request or response schema is provided
  • —No OpenAPI or machine-readable API specification found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:08:08Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/qPXe9v
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart