x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/114` is listed as "Premium API Access" and appears to be part of a broader catalog that spans data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are priced at $0.02 per request (20,000 base units of USDC with 6 decimals), require no API keys or rate limits, and are accessible instantly via the x402 payment header.
The probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. It accepts POST requests, pays to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and uses the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum timeout is 300 seconds. However, documentation beyond the landing page is essentially empty — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/114` endpoint specifically returns or what input it expects.
Because the endpoint path includes "trades/114" it likely returns trade-related data (possibly a specific trade record or trade analytics), but this is speculative. The broader platform advertises categories including metrics, reports, 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.
Capabilities
Use cases
- —Fetching trade-related data on a per-request payment basis without needing an API key
- —Integrating pay-per-use data endpoints into autonomous agent workflows
- —Accessing financial or trade information via x402 micropayments on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-request API access
- —Use cases requiring low-friction micropayment-gated data retrieval
- —x402-compatible clients on the Base network
Not for
- —Users needing detailed API documentation or guaranteed response schemas before integrating
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/114 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/114 is unknown. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format for /api/v1/trades/114.
- —The specific function of the /api/v1/trades/114 endpoint is unclear; 'Premium API Access' is a generic label.
- —The broader platform lists many endpoint categories but it is unknown which are actually functional.
Citations
- —The endpoint returns a valid x402 version 1 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/114
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/114
- —The platform offers endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categorieshttps://lowpaymentfee.com