x402basequality 0.35

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/charges/361

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.

The specific endpoint at `/api/v1/charges/361` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises categories including 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 (geocoding, validation, conversion, generation).

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 schema, no request/response examples, and no detailed documentation for any endpoint. It is unclear what this specific `/api/v1/charges/361` endpoint actually returns or what input it expects beyond a POST request with JSON content type.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datageocodingvalidation

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —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 per-request USDC micropayments
  • —Using utility services like geocoding, validation, and conversion without subscriptions

Fit

Best for

  • —Developers who want zero-commitment, pay-as-you-go API access
  • —Agents and bots that can settle payments programmatically via x402 on Base
  • —Users who prefer crypto-native micropayments over traditional API key subscriptions

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/361 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/361
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and no clarity on what this specific charges/361 endpoint actually does. The docs pages are all empty wallet-connect stubs.

Warnings

  • —No API documentation available — /docs, /api, /pricing, /README all show only 'Connect wallet'
  • —No OpenAPI or schema definition for any endpoint
  • —The specific purpose of /api/v1/charges/361 ('Premium API Access') is undefined — unclear what data or service it provides
  • —No request body schema or response examples available anywhere

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:52:19Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/9rqDTQ
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart