x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com offers a collection of pay-per-request API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/trades/5` is listed under "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises four categories of endpoints: 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 are priced at $0.02 per request.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/5` (the "5" path segment suggests a resource ID) is not documented, so it is unclear what trade data or action this endpoint provides. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Fetching trade data or executing trade-related queries via a single paid API call
- —Integrating pay-per-request endpoints into agent workflows without API key management
- —Accessing premium data behind x402 payment gates on the Base L2 network
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —x402-compatible agent wallets on Base
- —Low-friction micropayment API consumption at $0.02/call
Not for
- —Users needing detailed API documentation or OpenAPI specs before integration
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/5 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of /api/v1/trades/5 is undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found for any endpoint
- —The specific purpose and expected input/output of /api/v1/trades/5 is unknown
- —No example requests or responses are available anywhere in the crawled material
- —The '5' in the path suggests a hardcoded resource ID but its meaning is undocumented
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/trades/5
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs