x402basequality 0.40

x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/item/50

What it does

lowpaymentfee.com is an x402-enabled API platform that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 use the x402 payment protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.

The specific endpoint at `/api/v1/item/50` is listed as "Premium API Access" and returns a 402 challenge requesting payment of up to 20,000 units of USDC (0x8335... on Base). The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. However, the purpose and payload of this particular `/item/50` endpoint is unclear — the site's landing page lists many named endpoints but does not specifically document this one, and the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.

Because the crawled documentation pages are effectively empty and there is no OpenAPI spec, the actual request/response schema for this endpoint is unknown. The site advertises $0.02 per request across its listed endpoints, but the 402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 (in the asset's smallest unit), which would need to be interpreted in the context of USDC's 6 decimal places — equating to $0.02. The platform appears live and functional based on the 402 challenge response.

Capabilities

x402-paymentusdc-paymentbase-networkpay-per-requestjson-apino-api-keypost-method

Use cases

  • —Agents paying per-request for API access without needing API keys or subscriptions
  • —Programmatic access to data, AI, finance, or utility endpoints via x402 micropayments
  • —Web3-native applications consuming APIs with on-chain USDC payments on Base

Fit

Best for

  • —AI agents that need keyless, pay-per-use API access
  • —Developers wanting to test x402 payment flows on Base
  • —Applications requiring low-friction, no-signup API consumption

Not for

  • —Users needing detailed API documentation or OpenAPI specs (docs are currently empty)
  • —High-volume use cases where per-request pricing may be cost-prohibitive
  • —Anyone requiring non-USDC or non-Base payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/item/50
# Returns 402 with X-PAYMENT challenge
# Supply X-PAYMENT header with valid x402 payment proof to access the resource

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/item/50",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/item/50
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid 402 challenge, but documentation pages are empty (only 'Connect wallet' prompts). No OpenAPI spec, no request/response schema, and the specific /api/v1/item/50 endpoint is not documented on the landing page. The purpose of this particular endpoint is unclear.

Warnings

  • —Documentation pages (/docs, /pricing, /api, /README) return no useful content — only 'Connect wallet' prompts
  • —The specific endpoint /api/v1/item/50 is not listed among the named endpoints on the landing page; its purpose is unknown
  • —No OpenAPI spec or request/response schema available; request body format must be guessed
  • —No information about what data this endpoint actually returns after successful payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 19:34:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/QTEa3K
x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart