Pay-per-call premium API access on Base 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/131` 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 and settle in USDC on Base.
However, the specific `/api/v1/trades/131` endpoint does not appear in the site's publicly listed API catalog, and no documentation describes what data or functionality it returns. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further content. Without request/response schemas or documentation for this particular endpoint, its exact behavior is unknown.
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
- —Agents or scripts that need keyless, pay-as-you-go API access
- —Developers experimenting with x402 payment flows on Base
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-volume batch consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/131 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, and the specific /api/v1/trades/131 path is not listed in the site's public catalog. The docs/pricing/API pages are empty beyond a wallet-connect prompt. The actual functionality of this endpoint is unknown.
Warnings
- —The /api/v1/trades/131 endpoint is not listed in the site's public API catalog — its purpose and response format are undocumented.
- —All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec, request schema, or response schema is available for this endpoint.
- —The endpoint's actual behavior and data returned are completely unknown.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/131
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/131
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —The site lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com