x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/trades/144` 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 gated behind x402 micro-payments on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header. The x402 challenge timeout is 300 seconds.
The specific functionality behind `/api/v1/trades/144` is not documented in the crawled material. The site's landing page lists categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but this particular trades endpoint is not among the advertised routes. It may represent a trade-specific data lookup (e.g., retrieving details for trade ID 144), but without documentation or example responses, the exact behavior is uncertain.
Capabilities
Use cases
- —Retrieving trade-related data on a per-call payment basis
- —Integrating x402-gated endpoints into autonomous agent workflows
- —Accessing premium API data without subscription or API key management
Fit
Best for
- —Agents or applications that need keyless, pay-per-call API access
- —Developers experimenting with x402 micropayment protocols on Base
- —Use cases requiring low-friction, no-commitment API consumption
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/144 \
-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 for this specific /trades/144 route, no request/response schema, no examples, and the docs/pricing/README pages all returned only a 'Connect wallet' stub. The exact functionality is unknown.
Warnings
- —The specific endpoint /api/v1/trades/144 is not listed among the advertised APIs on the landing page — its purpose is unclear.
- —Documentation pages (/docs, /pricing, /README, /api) returned no useful content beyond 'Connect wallet'.
- —No request body schema or response schema is available; behavior must be discovered empirically.
- —The 'trades' path segment suggests financial data, which may carry regulatory implications depending on jurisdiction.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/trades/144
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/144
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com