Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/trades/172` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. 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 multiple API categories including 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 priced at $0.02 per request.
The specific endpoint probed here (`/api/v1/trades/172`) does not appear in the site's publicly listed API catalog, and its exact functionality is unclear — the description simply says "Premium API Access." There is no OpenAPI schema, no detailed documentation, and the docs/pricing/README pages all render only a "Connect wallet" prompt with no further content. The endpoint accepts POST requests and returns `application/json`.
Capabilities
Use cases
- —Accessing trade data or premium content behind a per-request USDC paywall
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic micropayment-gated data retrieval on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/172 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific endpoint /api/v1/trades/172 is not listed in the site's public catalog. Its actual functionality is unknown.
Warnings
- —The endpoint /api/v1/trades/172 is not listed in the site's public API catalog — its exact functionality is undocumented.
- —All documentation, pricing, and README pages render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, no request/response schema, and no usage examples are available.
- —The purpose of 'trades/172' (whether it returns trade data, executes a trade, or something else) cannot be determined from available material.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/172
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/172
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com