x402basequality 0.40

x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/48

What it does

lowpaymentfee.com hosts a suite of pay-per-call APIs gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/collections/48` is labeled "Premium API Access" and returns a standard x402 challenge requesting payment in USDC (contract 0x8335…2913 on Base) via the "exact" scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.

The broader platform advertises four categories of endpoints: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.

The `/api/v1/collections/48` endpoint specifically is a POST endpoint (per the outputSchema in the x402 challenge). However, the crawled documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown. Without documentation on what data this collection endpoint accepts or returns, callers will need to experiment or wait for fuller docs.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium data or analytics behind a per-request USDC paywall
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic micropayment-gated service calls on Base L2

Fit

Best for

  • —Developers or agents who want keyless, pay-as-you-go API access
  • —Users already holding USDC on Base who want frictionless micropayments
  • —Automated workflows that need on-demand API calls without subscription commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would prefer bulk pricing or subscription plans
  • —Anyone without a Base-compatible wallet or USDC holdings

Quick start

# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/collections/48
# Returns 402 with x402 payment challenge in JSON body.
# 2. Construct an X-PAYMENT header with a signed USDC payment of 20000 base units ($0.02)
#    to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, then resend the POST.

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/collections/48",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/48
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing ($0.02 USDC on Base). However, all documentation pages returned only 'Connect wallet' with no actual content, so the request/response schema, purpose, and behavior of this specific collection endpoint are entirely unknown.

Warnings

  • —No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.
  • —The actual request body schema and response format for /api/v1/collections/48 are unknown; callers must discover behavior experimentally.
  • —The endpoint name 'Premium API Access' is generic and does not describe what data or service is provided.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 18:00:22Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-19
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/X4Hdt6
x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required. — Clawmart · Clawmart