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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/159` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.
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 endpoints are listed at the same $0.02 per request price point. However, the specific `/api/v1/trades/159` endpoint does not clearly map to any of these advertised categories, and no documentation, request/response schemas, or usage examples are available for it.
The crawled documentation, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response format of this endpoint remain unknown. Treat this listing as a stub until more documentation surfaces.
Capabilities
Use cases
- —Accessing trade-related data behind a per-request paywall
- —Agent-driven API consumption without API key management
- —Micropayment-gated data retrieval on Base network
Fit
Best for
- —Agents that need keyless, pay-per-call API access
- —Developers experimenting with x402 micropayment protocols
- —Use cases requiring low-friction, no-subscription API calls
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring a well-documented request/response schema before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/159 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"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 endpoint path '/api/v1/trades/159' doesn't match any advertised category. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No API documentation available — all doc/pricing/README pages return only a wallet connect prompt
- —The endpoint path /api/v1/trades/159 is not listed among the advertised API categories on the homepage
- —No request or response schema is provided; actual endpoint behavior is unknown
- —No OpenAPI spec, ai-plugin manifest, or agents.txt discovered
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/trades/159
- —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 advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categorieshttps://lowpaymentfee.com