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/183` 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/183` is not documented in the crawled material. The path suggests it may return trade data for a specific trade ID (183), but this is speculative. The broader platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Fetching trade data on a per-request payment basis without needing an API key
- —Integrating pay-per-call data access into autonomous agent workflows
- —Accessing premium API resources using on-chain USDC micropayments on Base
Fit
Best for
- —Agents or applications that need keyless, pay-per-use API access
- —Developers who prefer on-chain micropayments over subscription billing
- —Use cases requiring low-friction access to trade or financial data
Not for
- —Users who need free or ad-supported API access
- —High-volume batch consumers who would benefit from bulk pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/183 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/trades/183 actually returns, no request/response schema, and all doc pages are empty stubs showing only 'Connect wallet'. The specific functionality of this endpoint is unknown.
Warnings
- —No documentation available — /docs, /pricing, /README all return only 'Connect wallet' with no content
- —The specific endpoint /api/v1/trades/183 is not listed among the advertised APIs on the homepage; its purpose is unclear
- —No request or response schema is provided; callers cannot know what to send or expect back
- —The broader platform lists many endpoint categories but none match the /trades path pattern
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/183
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/183
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /README) contain only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs