x402basequality 0.35

Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/6

What it does

lowpaymentfee.com is a multi-category API platform that sells access to various endpoints through the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/6` is labeled "Premium API Access" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.

The broader platform offers endpoints spanning 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 identically at $0.02 per call with no API keys, no rate limits, and no minimum commitments required.

This particular endpoint (`/api/v1/payments/6`) does not have a clear description of what data or service it returns beyond the generic "Premium API Access" label. It is not listed among the named endpoints on the landing page, so its specific functionality is unknown. The endpoint is live and returns a valid x402 challenge via POST. Documentation pages (/docs, /pricing, /api, /README) all rendered only a "Connect wallet" prompt with no additional technical content.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-method

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Testing x402 payment flows against a live endpoint

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns
  • —AI agents needing keyless, on-demand API access
  • —Low-volume consumers who want no subscription commitment

Not for

  • —Users needing detailed API documentation or schemas before purchasing
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone requiring non-crypto payment methods

Quick start

# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Without payment, it returns 402 with the payment challenge.
curl -X POST https://lowpaymentfee.com/api/v1/payments/6
# Returns 402 with x402 challenge specifying USDC on Base, $0.02 per call

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/payments/6",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/6
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no examples of successful responses, and the specific functionality behind 'Premium API Access' at /api/v1/payments/6 is entirely unknown. All doc pages render only 'Connect wallet' with no content.

Warnings

  • —The specific functionality of /api/v1/payments/6 is undocumented — it is not listed among the named endpoints on the landing page
  • —All documentation pages (/docs, /pricing, /api, /README) contain no usable content beyond a 'Connect wallet' prompt
  • —No OpenAPI spec, request schema, or response schema is available
  • —No example of a successful (paid) response is available to verify what the endpoint actually returns

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:18:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/hxqry4
Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart