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 platform 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/199` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (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 listed at the same $0.02/request price point. However, the specific `/api/v1/trades/199` endpoint does not clearly map to any of these documented categories, and no detailed documentation, request/response schemas, or examples are available for it. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Because the endpoint path includes a numeric ID (`/trades/199`), it likely returns data about a specific trade or transaction, but this is speculative. Without request body schemas or sample responses, callers will need to experiment to determine the expected input format and output structure.
Capabilities
Use cases
- —Retrieving trade or transaction data via a single micropayment
- —Programmatic access to premium data without subscription or API key management
- —Agent-driven data retrieval with on-chain payment settlement
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer no-commitment, usage-based pricing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/199 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific endpoint path (/trades/199) is not described anywhere on the site. Docs pages render only 'Connect wallet' with no content.
Warnings
- —No request body schema or response schema available for /api/v1/trades/199
- —The endpoint path does not match any of the documented API categories on the landing page
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content
- —The purpose of the /trades/199 endpoint is unclear — 'Premium API Access' is a generic label
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/199
- —All listed 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