x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/124

What it does

lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/124` is labeled "Premium API Access" and requires a USDC payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a Base address, with no API keys, rate limits, or upfront commitments required.

The broader platform advertises endpoints across 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 listed at $0.02 per request. However, the specific functionality behind the `/api/v1/payments/124` path is not documented beyond the generic "Premium API Access" label, so it is unclear what data or service this particular endpoint returns.

The endpoint is live and returns a valid x402 402 challenge. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keyno-rate-limit

Use cases

  • —Accessing premium API services with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —On-chain pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-call API access
  • —x402-compatible clients on the Base network
  • —Low-volume or exploratory API usage at $0.02/request

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or subscription plans
  • —Anyone requiring non-crypto payment methods

Quick start

# The endpoint returns HTTP 402 with an x402 challenge.
# Use an x402-compatible client to pay and access:
curl -X POST https://lowpaymentfee.com/api/v1/payments/124 \
  -H 'Content-Type: application/json'
# Response: 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment on Base.

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/124",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/124
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 upon successful payment, no OpenAPI spec, no request/response examples, and the docs pages are empty. The specific function of /api/v1/payments/124 is unknown beyond the generic label.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content
  • —The specific functionality of /api/v1/payments/124 is undocumented; 'Premium API Access' is a generic label
  • —No OpenAPI spec or request/response schema provided
  • —No examples of successful (paid) responses available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:32:00Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/A2UGTm
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart