x402basequality 0.35

x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/166

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.

The specific endpoint `/api/v1/charges/166` is labeled "Premium API Access" and accepts POST requests. Payment is handled inline via the x402 protocol: callers receive a 402 challenge with payment details, settle in USDC (contract 0x8335…2913 on Base), and then gain access to the response. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are required — access is purely pay-per-call.

Note that the crawled documentation pages (docs, api, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual functionality behind this specific charge endpoint is unclear. The platform lists many other endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) but the precise capability of `/api/v1/charges/166` is not documented beyond its title. Users should verify what data or service this endpoint returns before relying on it in production.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium data or services without creating an account or obtaining API keys
  • —Agent-driven workflows that need instant, keyless API access settled in USDC
  • —Testing x402 payment protocol integrations on Base network

Fit

Best for

  • —Developers wanting zero-friction, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed documentation or guaranteed SLAs before purchasing
  • —Anyone without a Base-network USDC wallet
  • —High-volume use cases where $0.02/request adds up without bulk discounts

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/166
# Returns 402 with x402 challenge. Include 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/charges/166",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/166
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 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 of what the endpoint actually returns after payment, no OpenAPI schema, no examples of successful responses, and all doc pages are empty. The specific functionality behind 'Premium API Access' at /charges/166 is entirely undocumented.

Warnings

  • —The actual functionality behind /api/v1/charges/166 is undocumented — 'Premium API Access' is the only description available.
  • —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content.
  • —No OpenAPI schema, no response examples, and no input schema beyond 'POST with HTTP'.
  • —Cannot verify what data or service is returned after successful payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:24:03Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/8j6kRa
x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys. — Clawmart · Clawmart