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/charges/306` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises categories including: metrics and reports APIs, data export and insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There are no OpenAPI schemas, request/response examples, or detailed descriptions of what any individual endpoint actually returns. The exact functionality behind the `/api/v1/charges/306` "Premium API Access" endpoint is unclear and cannot be determined from available material.
Capabilities
Use cases
- —Agent-driven API consumption without pre-registration or API keys
- —Micropayment-gated access to AI inference endpoints (sentiment, summarization, classification, embeddings)
- —On-demand financial data retrieval (prices, exchange rates, gas estimates)
- —Utility operations like geocoding, validation, and data conversion
Fit
Best for
- —AI agents needing frictionless, keyless API access via x402
- —Developers wanting pay-as-you-go pricing with no commitments
- —Web3-native applications that can settle in USDC on Base
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone unable to transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/306 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the actual functionality of the '/api/v1/charges/306' endpoint is undefined. The listing is effectively a stub.
Warnings
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available for any endpoint
- —The exact functionality of /api/v1/charges/306 ('Premium API Access') is unknown — it does not correspond to any of the named endpoints on the homepage
- —Cannot verify what data or service is actually returned upon successful payment
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/charges/306
- —Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com