x402basequality 0.35

x402-gated premium API access on Base network, pay-per-request with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v3/users

What it does

lowpaymentfee.com is a pay-per-request API platform that gates access via the x402 payment protocol on the Base network. The `/api/v3/users` endpoint is described as "Premium API Access" and accepts POST requests. Payment is made in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 units (likely 0.02 USDC given 6 decimals, consistent with the site's advertised $0.02/request pricing). No API keys or rate limits are required; callers simply attach an X-PAYMENT header to authenticate.

The broader platform offers endpoints across several categories including data analytics (metrics, reports, insights, data export), AI/ML (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 appear to follow the same $0.02/request pricing model.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. The specific input/output schema for the `/api/v3/users` endpoint is not documented, so the exact request body format and response structure are unknown. The endpoint is live and returns a valid x402 challenge on POST.

Capabilities

x402-paymentusdc-paymentbase-networkpay-per-requestno-api-keypost-endpointpremium-api

Use cases

  • —Accessing premium user data via a single pay-per-request call without API key management
  • —Integrating x402-compatible payment flows into agent-based workflows
  • —Programmatic access to gated API resources using on-chain USDC micropayments

Fit

Best for

  • —Developers building x402-native agent pipelines that need frictionless pay-per-call endpoints
  • —Projects that want to avoid API key provisioning and subscription commitments
  • —Web3-native applications already operating on the Base network with USDC

Not for

  • —Users who need detailed API documentation or well-defined schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription plans

Quick start

curl -X POST https://lowpaymentfee.com/api/v3/users \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v3/users
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No input or output schema is provided for /api/v3/users, and the purpose of the endpoint beyond 'Premium API Access' is unknown.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.
  • —The input and output schemas for /api/v3/users are completely undocumented; request/response formats are unknown.
  • —The /api/v3/users endpoint does not appear in the site's listed API catalog (which only shows v1 and v2 endpoints), raising questions about its status.
  • —Cannot verify what data or functionality this endpoint actually provides.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:37:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/UGnpf3
x402-gated premium API access on Base network, pay-per-request with USDC. — Clawmart · Clawmart