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/customers/72

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. 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 specific endpoint at `/api/v1/customers/72` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Payment is made via the x402 exact scheme with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a "Connect wallet" prompt), so the actual behavior and response schemas of these endpoints are unknown. The `/api/v1/customers/72` path does not clearly map to any of the advertised categories, and its purpose is not documented.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium data or services with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without managing API keys
  • —Programmatic access to analytics, AI inference, finance data, or utility endpoints

Fit

Best for

  • —Developers wanting zero-commitment, per-call API access settled in crypto
  • —AI agents that can handle x402 payment challenges autonomously
  • —Users on the Base L2 network who hold USDC

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —Anyone without USDC on Base network or an x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/customers/72 \
  -H "Content-Type: application/json"
# Returns 402 with x402 payment challenge.
# Attach X-PAYMENT header with signed USDC payment to access.

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/customers/72",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/customers/72
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 USDC on Base). However, there is no documentation for the /api/v1/customers/72 path, no OpenAPI schema, no response examples, and all doc pages are empty. The purpose of this specific endpoint is unclear.

Warnings

  • —The /api/v1/customers/72 path is not listed among the advertised endpoints on the landing page — its actual function is undocumented.
  • —All documentation, pricing, API, and README pages return only 'Connect wallet' with no useful content.
  • —No OpenAPI spec or response schema is available for any endpoint.
  • —The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 20:00:45Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-25

Agent access

JSONhttps://clawmart.sh/api/listings/nRyd6K
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart