Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscriptions required.
The specific endpoint `/api/v1/products/13` is listed under the title "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and settles payments in USDC (contract 0x8335…2913) on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02/request price point. However, documentation for individual endpoints is extremely sparse: the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. Without request/response schemas or examples for this specific product endpoint, the exact input format and output structure remain unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven API consumption without pre-registration or API key management
- —Integrating pay-as-you-go API calls into Web3-native workflows
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —High-volume consumers who would benefit from bulk pricing or rate-limited plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint — no request schema, no response schema, no examples, and the product name 'Premium API Access' is entirely generic. The docs/pricing/API pages are all blank beyond a wallet-connect prompt.
Warnings
- —No request or response schema available for /api/v1/products/13
- —The endpoint name 'Premium API Access' is generic and does not describe actual functionality
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content
- —Exact purpose and data returned by this endpoint are unknown
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/13
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/products/13
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com