x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/236

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/236` 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, subscriptions, or rate limits 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 "Premium API Access" endpoint actually returns. The site lists 16 different API paths but provides no detail on input parameters or output formats for any of them. Without documentation, it is unclear what data or functionality this specific charges/236 endpoint provides versus the other listed endpoints.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keydata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datageocodingutility-apis

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 utility operations like geocoding, validation, and data conversion with micropayments

Fit

Best for

  • —Agents or developers who want zero-signup, pay-as-you-go API access
  • —Use cases requiring small, infrequent API calls where subscriptions are overkill
  • —x402-compatible wallets and agents on the Base network

Not for

  • —High-volume production workloads where per-call pricing adds up quickly
  • —Users who need detailed API documentation, SLAs, or guaranteed uptime
  • —Non-crypto users without a Base-compatible wallet holding USDC

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/236 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/236
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, documentation is essentially nonexistent — every doc/pricing/API page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The listing is effectively a stub with confirmed liveness and pricing.

Warnings

  • —No documentation available — all doc pages render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —It is unclear what 'Premium API Access' at /api/v1/charges/236 specifically provides versus the 16 other listed endpoints
  • —No examples of actual API responses anywhere on the site

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:34:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/qnmX5G
Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call. — Clawmart · Clawmart