x402basequality 0.30

Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transfers/182

What it does

lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/transfers/182` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is settled on the Base L2 network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a "Connect wallet" prompt), so the actual behavior, request/response schemas, and data sources behind these endpoints are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Programmatic access to utility or data APIs without managing API keys or subscriptions
  • —Agent-driven workflows that need on-demand paid API calls settled in USDC on Base
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers wanting zero-friction, keyless API access via crypto micropayments
  • —AI agents that can autonomously pay for API calls using x402
  • —Users who prefer pay-as-you-go pricing with no minimums or commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transfers/182 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transfers/182
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and no indication of what this specific 'Premium API Access' endpoint actually does. The docs, pricing, and API pages are all empty beyond a wallet-connect prompt.

Warnings

  • —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.
  • —The purpose and behavior of /api/v1/transfers/182 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.
  • —No request or response schema is available; integration requires trial-and-error.
  • —The platform lists many endpoints on its landing page but none have documented schemas or example responses.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:05:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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