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/188` 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/188` is not documented in the crawled material. The path suggests a trade-related resource (possibly a specific trade record or trade execution endpoint), but no schema, request body format, or response examples are available. The broader site lists categories like finance/prices, crypto/quotes, and crypto/gas, so this endpoint likely falls within the finance or trading domain. Documentation pages (/docs, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Fetching or executing trade-related data via a single paid API call
- —Integrating pay-per-use API access into autonomous agents without managing API keys
- —Accessing financial or trading data on-demand with USDC micropayments on Base
Fit
Best for
- —Agents or bots that need keyless, pay-per-call API access
- —Developers wanting to test x402 payment flows on Base
- —Use cases requiring low-cost ($0.02) on-demand API calls without subscriptions
Not for
- —Users who need detailed documentation or well-defined request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/188 \
-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 this specific endpoint — no request schema, no response schema, no examples. The /docs, /pricing, and /README pages are all empty (just 'Connect wallet'). The purpose of /api/v1/trades/188 is unclear.
Warnings
- —No documentation available — /docs, /pricing, and /README pages all return only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/trades/188 is undocumented; the path suggests trade data but details are unknown.
- —No request body schema or response schema is provided.
- —No OpenAPI spec or AI plugin manifest found.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).https://lowpaymentfee.com/api/v1/trades/188
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network.https://lowpaymentfee.com
- —The site lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com