x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transfers/57

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.

The specific endpoint at `/api/v1/transfers/57` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response formats of these endpoints remain undocumented. The specific functionality behind the `/api/v1/transfers/57` endpoint is unclear — the name "Premium API Access" and the path segment "transfers/57" do not clearly indicate what data or service is returned.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing pay-per-call API services without traditional API key registration
  • —Making micropayments for API calls using USDC on Base
  • —Agent-driven API consumption with on-chain settlement

Fit

Best for

  • —Developers wanting keyless, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or response schemas before purchasing
  • —High-volume consumers who need bulk pricing or rate guarantees
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transfers/57 \
  -H "Content-Type: application/json"
# Returns 402 with x402 payment challenge; attach X-PAYMENT header after settling $0.02 USDC 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/transfers/57",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transfers/57
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, and pricing is clear at $0.02 USDC. However, there is no documentation of what the endpoint actually returns after payment, no OpenAPI schema, no response examples, and the docs/pricing/README pages are all empty. The purpose of 'transfers/57' is opaque.

Warnings

  • —No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content
  • —The specific functionality of /api/v1/transfers/57 ('Premium API Access') is completely undocumented
  • —No OpenAPI spec or response schema provided
  • —No way to verify what data or service is delivered after payment without actually paying

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:18:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/QyR3jh
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart