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/110` is listed as "Premium API Access" and accepts POST requests. Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per request.
The platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform claims no API keys, no rate limits, and instant access — authentication and billing are handled entirely through the x402 payment challenge.
Documentation is extremely sparse. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/trades/110` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what trade data or functionality this specific route provides.
Capabilities
Use cases
- —Fetching trade data or executing trade-related queries via a single paid API call
- —Integrating pay-per-use API access into autonomous agents without managing API keys
- —Programmatic access to premium data behind x402 micropayment gating
Fit
Best for
- —Developers building on Base who want frictionless per-call API billing
- —AI agents that can settle x402 payments autonomously
- —Users who prefer pay-as-you-go over subscription-based API access
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Developers not set up for USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/110 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of the specific /api/v1/trades/110 route is undocumented.
Warnings
- —No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content.
- —The specific purpose and expected input/output of /api/v1/trades/110 is completely undocumented.
- —No OpenAPI schema or request/response examples are provided anywhere.
- —Cannot verify what data or functionality this endpoint actually delivers.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/110
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/110