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, no rate limits, and no subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/35` is listed as "Premium API Access" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. However, the exact functionality behind this particular `/transfers/35` path is not documented on the site — the landing page catalogs analytics, AI, finance, and utility endpoints but does not mention a "transfers" category.
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 — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further content, so detailed request/response schemas for any endpoint are unavailable.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Programmatic data retrieval or utility calls without subscription commitments
Fit
Best for
- —Developers who want zero-commitment, pay-as-you-go API access
- —AI agents with x402-compatible payment capabilities
- —Users already holding USDC on Base who want frictionless API calls
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers without USDC on Base or unfamiliar with x402 payment flows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/35 \
-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 endpoint's purpose ("transfers/35") is undocumented. No OpenAPI schema, no request/response examples, and all doc pages beyond the landing page are empty. The listing is effectively a stub with confirmed liveness.
Warnings
- —The exact functionality of /api/v1/transfers/35 ('Premium API Access') is not described anywhere in the crawled content — the transfers category does not appear on the landing page.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint.
- —The broad catalog of endpoints listed on the homepage (AI, analytics, finance, utils) could not be verified beyond their listing — none were probed.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/transfers/35
- —Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.https://lowpaymentfee.com