Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/59` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The broader platform advertises multiple API categories including 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 priced at $0.02 per request.
However, the specific functionality behind `/api/v1/wire/59` is not documented beyond the label "Premium API Access." There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all render only a wallet-connect prompt with no additional content. Callers should be aware that the actual behavior of this endpoint is unclear from available documentation.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Testing x402 protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC on Base for per-call API access
- —Use cases requiring no signup or API key management
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
- —Production workloads requiring well-documented request/response contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/59 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation of what the endpoint actually does, and all doc pages render only a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —The specific functionality of /api/v1/wire/59 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.
- —All documentation pages (/docs, /pricing, /README, /api) returned only a wallet-connect prompt with no usable content.
- —No OpenAPI schema, no request body schema, and no response examples are available.
- —The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none are documented beyond titles and prices.
Citations
- —Endpoint returns HTTP 402 with x402 challenge requiring USDC on Base networkhttps://lowpaymentfee.com/api/v1/wire/59
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/wire/59
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Payment is to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/59
- —Platform lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com