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/139` 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 x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract `0x8335…2913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payments are sent to `0x1A2B…85F3` with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.
However, the specific functionality of `/api/v1/trades/139` is unclear. The site's landing page lists categories like Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but does not mention a `/trades/` path. The `139` in the URL may be a resource or trade ID. No request/response schema documentation was found — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation on what this particular endpoint accepts or returns, consumers should treat this as an exploratory integration.
Capabilities
Use cases
- —Accessing trade-related data or executing trade lookups via a single paid API call
- —Integrating pay-per-request APIs into agent workflows without managing API keys
- —Exploring x402 protocol-based micropayment endpoints on Base
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base automatically
- —Use cases needing keyless, per-call API access
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need free or subscription-based API access
- —Anyone needing detailed trade analytics with guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/139 \
-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 the /trades/139 path, no request/response schema, and the docs pages are empty. The specific purpose of this endpoint is unknown.
Warnings
- —No documentation found for /api/v1/trades/139 — the path is not listed on the site's landing page
- —All doc/pricing/API/README pages returned only 'Connect wallet' with no content
- —The '139' in the URL may be a specific resource ID; the general /trades/ endpoint behavior is undocumented
- —Request and response schemas are completely unknown
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/trades/139
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/139
- —The site advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The landing page lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure but does not list a /trades/ pathhttps://lowpaymentfee.com