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 at `/api/v1/trades/155` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.
The broader 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 specific `/api/v1/trades/155` endpoint is not explicitly described in the site's category listings, so its exact functionality is unclear — it may relate to a specific trade record or a trades-related API. The endpoint accepts POST requests and returns `application/json`. Documentation pages (docs, pricing, README) were effectively empty beyond a wallet-connect prompt, so detailed request/response schemas are unavailable.
Capabilities
Use cases
- —Accessing trade data or trade-related information via a single micropayment
- —Programmatic pay-per-call API consumption without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand premium data with crypto settlement
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over traditional subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/155 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) with clear pricing ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/trades/155 is not described anywhere on the site. Docs pages are empty wallet-connect stubs.
Warnings
- —The specific endpoint /api/v1/trades/155 is not listed in the site's public API catalog — its exact functionality is unknown.
- —All documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no actual content.
- —No OpenAPI spec, request schema, or response schema is available.
- —No examples of request or response payloads could be found.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network via x402 exact scheme.https://lowpaymentfee.com/api/v1/trades/155
- —All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02.https://lowpaymentfee.com