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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, 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, settled in USDC on the Base network.
The specific endpoint `/api/v1/wire/78` is listed as "Premium API Access" with a max amount of 20,000 base units of USDC (0.02 USDC = $0.02). It accepts POST requests and returns application/json. Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are required. You simply attach an X-PAYMENT header with a valid x402 payment proof.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular wire/78 endpoint actually returns. The site's landing page confirms the pricing model and lists available API categories, but does not explain what `/api/v1/wire/78` specifically does versus the other named endpoints. Treat this as a low-documentation endpoint where the actual functionality behind "Premium API Access" is unclear.
Capabilities
Use cases
- —Programmatic pay-per-call API access without API keys or subscriptions
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents needing keyless, pay-per-request API access
- —Users who want to avoid subscription commitments for occasional API calls
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone who needs to know exactly what the endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/78 \
-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), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint actually does. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —The specific functionality of /api/v1/wire/78 ('Premium API Access') is undefined — it is unclear what data or service it provides
- —No OpenAPI schema, no request body schema, and no response examples are available
- —No robots.txt or agents.txt found
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/wire/78
- —Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com