x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/22

What it does

lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/22` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header to each request.

The broader platform advertises 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 listed endpoints share the same $0.02/request pricing.

However, this specific endpoint (`/api/v1/charges/22`) has a generic "Premium API Access" description with no documentation on what data or functionality it actually returns. The docs, pricing, and README pages on the site all render only a "Connect wallet" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, it is unclear what this particular endpoint does beyond accepting a paid POST request and returning JSON.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyjson-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 payment protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —AI agents that can autonomously pay for API calls via crypto
  • —Use cases requiring keyless, pay-as-you-go API access

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume production workloads where the actual response payload is undocumented
  • —Anyone without a Base-compatible wallet or USDC holdings

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/22 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/22
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint description is entirely generic. The site's docs/pricing/README pages are empty beyond a wallet-connect prompt.

Warnings

  • —No documentation available — docs, pricing, and README pages only show 'Connect wallet'
  • —No OpenAPI or output schema describing what this endpoint actually returns
  • —The endpoint name 'Premium API Access' is generic and does not describe its function
  • —No request body schema or example responses are available anywhere in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:30:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/gw6kVb
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart