Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/payments/88` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 "exact" scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, API, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual functionality behind each endpoint is unverified. The specific behavior of the `/api/v1/payments/88` endpoint is unclear — its name "Premium API Access" is generic and does not describe a concrete capability.
Capabilities
Use cases
- —Accessing pay-per-call API services without needing API keys or subscriptions
- —Making micropayments for individual API requests using USDC on Base
- —Agent-driven workflows that need on-demand API access with crypto settlement
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost per-request pricing without rate limits
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-crypto payment methods
- —High-volume use cases where subscription pricing would be more economical
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/88 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but the actual functionality behind "Premium API Access" is completely undocumented. All documentation pages return only a wallet-connect prompt with no content. No request/response schemas, no examples, and no description of what the endpoint actually does.
Warnings
- —The endpoint name 'Premium API Access' is generic and does not describe a specific capability — actual behavior is unknown.
- —All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only 'Connect wallet' prompts.
- —No OpenAPI spec, no request schema, and no response schema are available.
- —The broader platform lists many endpoint categories (AI, finance, data) but none are verified to actually function.
Citations
- —Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/88
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/payments/88
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com