x402basequality 0.35

Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/203

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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, paid in USDC on the Base network.

The specific endpoint at `/api/v1/charges/203` is labeled "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are required. The endpoint accepts POST requests and returns application/json.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The listing title "Premium API Access" is generic and does not clarify what data or functionality this specific charge endpoint provides. Without documentation, it is unclear what request body (if any) should be sent or what the response payload looks like.

Capabilities

x402-paymentpay-per-requestusdc-basedata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datageocodingutility-apis

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration
  • —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
  • —Running data analytics queries and exporting data with instant crypto micropayments
  • —Using utility services like geocoding and validation without subscription commitments

Fit

Best for

  • —Agents and developers who want zero-signup, pay-as-you-go API access
  • —Crypto-native applications that can settle USDC payments on Base
  • —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions

Not for

  • —Users who need detailed API documentation, schemas, or SLAs before integrating
  • —High-volume production workloads where bulk pricing or rate guarantees are needed
  • —Developers without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/203 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/203
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the endpoint name 'Premium API Access' is vague. The actual functionality behind /api/v1/charges/203 is unclear.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'
  • —No OpenAPI or schema definition found for any endpoint
  • —The specific endpoint /api/v1/charges/203 has a generic 'Premium API Access' label with no description of what it actually does or returns
  • —No request body schema or response examples are available anywhere in the crawled content
  • —The endpoint path '/api/v1/charges/203' does not match any of the documented API paths on the homepage, making its purpose unclear

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:31:39Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/e9gY2f