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/198` appears to be part of a broader platform offering dozens of pay-per-call 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/198` is not documented in the crawled material. The path suggests it may return trade data for a specific trade ID (198), 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 beyond the landing page returned only a "Connect wallet" prompt with no further technical detail.
Capabilities
Use cases
- —Fetching trade data for a specific trade ID via a single paid API call
- —Programmatic access to premium data without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand paid data retrieval on Base
Fit
Best for
- —Developers wanting zero-friction, keyless API access with crypto micropayments
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer pay-per-use pricing over monthly subscriptions
Not for
- —Users who need free or ad-supported API access
- —Applications requiring high-throughput bulk data with volume discounts
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/198 \
-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). However, there is no documentation for the specific /api/v1/trades/198 resource — no request schema, no response schema, no examples. The docs, pricing, and README pages all returned only 'Connect wallet' with no technical content. The actual functionality of this specific endpoint is unknown.
Warnings
- —No documentation available for /api/v1/trades/198 — the endpoint's specific functionality is unclear
- —All documentation pages beyond the landing page returned only 'Connect wallet' with no technical detail
- —No OpenAPI spec, request schema, or response schema available
- —The endpoint path suggests trade-specific data but this is inferred from the URL pattern, not confirmed
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/198
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/198
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com