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 a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/78` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
However, the specific `/api/v1/trades/78` endpoint does not clearly map to any of the documented categories on the landing page. There is no dedicated documentation, request/response schema, or example payloads available for this particular route. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content. As a result, the exact functionality of this endpoint remains unclear beyond its generic "Premium API Access" label.
Capabilities
Use cases
- —Accessing premium trade data or executing trade-related operations via a single paid POST call
- —Integrating pay-per-request APIs into agent workflows without managing API keys
- —Settling micro-transactions for API access using USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/78 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02 per call. However, there is no documentation, no request/response schema, no examples, and the specific /api/v1/trades/78 route is not listed among the documented endpoints on the landing page. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The endpoint path /api/v1/trades/78 does not appear in the provider's own listed API catalog — its exact functionality is unknown.
- —No request body schema or response schema is documented anywhere.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.
- —The purpose of the numeric ID '78' in the path is unexplained.
Citations
- —The endpoint returns a 402 challenge requesting USDC payment on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/trades/78
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/78
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com