x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific resource `/api/v1/trades/191` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.
The endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base, using the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific functionality behind `/api/v1/trades/191` is not documented in the crawled material. The path suggests it may return data about a particular trade (ID 191), but no request/response schema or documentation was found beyond the generic "Premium API Access" label. The broader site lists categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — but this particular trades endpoint is not among those listed on the homepage.
Capabilities
Use cases
- —Fetching trade data for a specific trade ID via a single paid API call
- —Integrating pay-per-request trade information into an automated agent workflow
- —Accessing premium data without managing API keys or subscriptions
Fit
Best for
- —Agents that need on-demand trade data with no signup friction
- —Developers experimenting with x402 micropayment-gated APIs
- —Workflows requiring low-cost, single-call data retrieval on Base
Not for
- —High-volume bulk data retrieval where per-call pricing adds up
- —Use cases requiring detailed API documentation or guaranteed SLAs
- —Users who cannot settle payments in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/191 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific /trades/191 endpoint — no request schema, no response schema, no examples. The crawled docs/pricing/README pages all returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is unknown beyond the generic 'Premium API Access' label.
Warnings
- —No documentation found for /api/v1/trades/191 — its specific functionality is unknown
- —The /trades/191 endpoint is not listed among the homepage's advertised APIs, raising questions about what it actually returns
- —All docs, pricing, README, and API pages returned only 'Connect wallet' with no substantive content
- —No request or response schema available; callers must discover behavior empirically
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring 20000 base units of USDChttps://lowpaymentfee.com/api/v1/trades/191
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/191
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The homepage lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com