Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/352` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including 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 uniformly at $0.02 per request.
However, the specific functionality behind `/api/v1/transactions/352` is unclear. The endpoint path suggests a transaction-related resource, but no documentation, request schema, or response schema is available beyond the generic "Premium API Access" label. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content. Without paying and calling the endpoint, the actual response payload and purpose remain unknown.
Capabilities
Use cases
- —Accessing premium API data without traditional API key registration
- —Making one-off API calls with instant USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
Fit
Best for
- —Developers who want zero-signup API access via crypto payments
- —AI agents that can autonomously pay for API calls using x402
- —Users already holding USDC on the Base network
Not for
- —Users who need detailed API documentation before purchasing
- —Anyone without a Base-network USDC wallet or x402-compatible client
- —High-volume use cases where per-request pricing may add up
Quick start
# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.
# Using curl to see the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/transactions/352
# Returns 402 with x402 challenge. Use an x402 client library to
# automatically handle payment and retry.Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, and no explanation of what '/api/v1/transactions/352' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.
- —The specific purpose and response format of /api/v1/transactions/352 is unknown; 'Premium API Access' is the only description.
- —No OpenAPI spec, no request schema, and no response schema are provided.
- —Cannot verify what data or service is actually delivered after payment.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/352
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/352