x402basequality 0.40

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/products/41

What it does

lowpaymentfee.com is an x402-enabled API marketplace offering a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/products/41` is listed as "Premium API Access" and returns `application/json` via POST.

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 utilities (geocoding, validation, conversion, generation). All endpoints follow the x402 payment protocol: callers receive a 402 challenge with payment details, settle in USDC on Base, and then receive the response.

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 individual endpoint. The `/api/v1/products/41` endpoint's purpose beyond "Premium API Access" is unclear from available material.

Capabilities

x402-paymentusdc-base-networkpay-per-requestjson-responseno-api-keydata-analyticsai-inferencefinance-dataweb3-datautility-services

Use cases

  • —Accessing analytics metrics or reports on a per-call basis without subscriptions
  • —Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments
  • —Fetching real-time crypto token quotes, gas estimates, or exchange rates
  • —Geocoding, data validation, or format conversion via utility endpoints

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Projects needing low-cost micropayment-gated API calls in USDC

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume production workloads requiring SLAs or guaranteed uptime
  • —Users without a Base-compatible USDC wallet

Quick start

# 1. POST to the endpoint — you'll get a 402 with payment challenge
curl -X POST https://lowpaymentfee.com/api/v1/products/41

# 2. Pay the USDC challenge on Base, then resend with X-PAYMENT header
curl -X POST https://lowpaymentfee.com/api/v1/products/41 \
  -H "X-PAYMENT: <signed-payment-token>"

Example

Response

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://lowpaymentfee.com/api/v1/products/41",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/products/41
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 in USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/products/41 beyond 'Premium API Access' is unknown.

Warnings

  • —No documentation available — all doc/pricing/README pages render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for this endpoint
  • —The specific function of /api/v1/products/41 ('Premium API Access') is unclear; it may be a generic product listing or a meta-endpoint
  • —Cannot verify what data or service is actually returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 23:38:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/5g3yMD
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart