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/130` is listed as "Premium API Access" and advertises a max cost of 20,000 base units of USDC (0.02 USDC = $0.02) per call. The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme on Base, and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` is the canonical USDC contract on Base.
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. However, documentation is extremely thin: the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response format of this specific transactions endpoint is unknown.
Capabilities
Use cases
- —Accessing data analytics and reports without creating an account or managing API keys
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time crypto prices, gas estimates, and exchange rates
- —Geocoding, validation, and data conversion utilities
Fit
Best for
- —Developers who want zero-friction, keyless API access paid in USDC
- —Agents and bots that can settle x402 payments on Base automatically
- —Quick prototyping where subscription commitments are undesirable
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where per-request pricing at $0.02 may be costly at scale
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/130 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual functionality of the /api/v1/transactions/130 endpoint is undocumented and cannot be verified from available material.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet' with no technical content.
- —No OpenAPI or schema specification found; request and response formats are unknown.
- —The specific purpose of /api/v1/transactions/130 ('Premium API Access') is unclear — it does not map to any of the named endpoints on the landing page.
- —Platform appears to be a generic multi-category API marketplace; actual data sources and model quality are unverified.
Citations
- —All endpoints priced at $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns 402 with maxAmountRequired 20000 USDC (0.02 USD) on Base, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/130
- —Platform lists endpoints for analytics, AI/ML, finance/crypto, and utility categorieshttps://lowpaymentfee.com