x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys needed.
What it does
lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/trades/125` is listed as "Premium API Access" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme with no API keys, subscriptions, or rate limits advertised.
The broader lowpaymentfee.com platform advertises endpoints across four categories: 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.
However, the specific `/api/v1/trades/125` endpoint does not appear in the site's published API catalog, and no documentation describes what data or functionality it provides. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Without documentation or an output schema, the actual behavior and response format of this endpoint remain unknown.
Capabilities
Use cases
- —Accessing trade-related data or functionality behind a micropayment wall
- —Agent-driven workflows that need keyless, pay-per-call API access on Base
- —Programmatic purchasing of premium API responses using USDC
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation before integrating
- —High-volume consumers who want bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/125 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, the /trades/125 path is not listed in the site's own catalog, no documentation exists beyond a wallet-connect prompt, there is no output schema describing the response, and no example request/response bodies are available. This is effectively a stub listing.
Warnings
- —The /api/v1/trades/125 endpoint is not listed in the provider's own published API catalog — its purpose is unclear.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No output schema or response examples are available; actual response format is unknown.
- —The endpoint path suggests a specific trade record (ID 125), but no context explains what 'trades' means in this platform.
Citations
- —The x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/125
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/125
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com