Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/204` is listed as "Premium API Access" and advertises a max cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms it accepts POST requests and returns application/json. However, the exact functionality of this particular transactions endpoint is not documented in the crawled material — the site's landing page lists analytics, AI, finance, and utility endpoints but does not describe a `/transactions/204` route.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas for any endpoint are unavailable.
Capabilities
Use cases
- —Agents that need on-demand API access without pre-registration or API keys
- —Programmatic access to utility or data endpoints with per-call crypto payment
- —Testing x402 payment protocol integrations on Base network
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/204 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the specific /transactions/204 endpoint has no documentation. All docs pages beyond the landing page returned only 'Connect wallet' with no content. No request/response schemas, no examples, and the purpose of this particular endpoint is unclear.
Warnings
- —The /api/v1/transactions/204 endpoint is not listed on the site's landing page catalog — its specific functionality is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint.
- —The broader platform lists many endpoint categories but none of them could be verified for actual functionality from the crawl.
Citations
- —All endpoints priced at $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/204
- —Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with 6 decimalshttps://lowpaymentfee.com/api/v1/transactions/204