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 on the Base network. The specific resource `/api/v1/trades/138` appears to be part of a broader platform offering data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utility endpoints — all gated behind per-request USDC micropayments.
The x402 challenge confirms the endpoint is live and accepts payments in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment timeout is 300 seconds.
However, the specific functionality of `/api/v1/trades/138` is unclear. The path suggests a trade-related resource (possibly retrieving or executing a trade record with ID 138), but no documentation, request schema, or response schema is available. The site's docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Without knowing what this endpoint actually returns, callers should treat this as an exploratory integration.
Capabilities
Use cases
- —Accessing trade data or executing trade-related operations via a single micropayment
- —Exploring x402 payment protocol integration with USDC on Base
- —Building agent workflows that pay per API call without API key management
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents needing keyless, pay-per-call API access on Base
- —Low-volume consumers who prefer no subscriptions or commitments
Not for
- —Users who need detailed API documentation before integrating
- —High-volume production workloads where per-request pricing at $0.02 may add up
- —Anyone needing guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/138 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/trades/138 is unknown. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —The specific functionality of /api/v1/trades/138 is undocumented — the path suggests trade data but no schema or description is available beyond the generic 'Premium API Access' label.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No request body schema or response schema is provided; callers must discover behavior experimentally.
- —The endpoint path includes a numeric ID (138) which may refer to a specific resource that could become stale or invalid.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/138
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/138
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —The site lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com