Pay-per-call API suite on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network, settled in USDC. The specific endpoint at `/api/v1/wire/20` is labeled "Premium API Access" and requires a maximum payment of 20,000 base units of USDC (i.e., $0.02) per call. The site advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each POST request.
The broader platform groups its endpoints into 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 listed endpoints share the same $0.02 per-request pricing.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The x402 challenge confirms the endpoint is live and accepting POST requests, but without documentation it is unclear what request body the `/api/v1/wire/20` endpoint expects or what it returns. The endpoint's purpose beyond the generic "Premium API Access" label is unknown.
Capabilities
Use cases
- —Accessing pay-per-request data, AI, finance, or utility APIs without managing API keys or subscriptions
- —Programmatic agents making one-off API calls settled instantly in USDC on Base
- —Testing x402 payment protocol integrations against a low-cost endpoint
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Prototyping x402 payment flows at minimal cost ($0.02/call)
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up without bulk discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/20 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, no request/response schemas, and no examples. The docs pages are all empty 'Connect wallet' stubs. Effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content
- —No OpenAPI spec or request/response schema provided; it is unknown what /api/v1/wire/20 actually does beyond 'Premium API Access'
- —The endpoint's specific functionality is completely undocumented; callers must experiment to discover behavior
- —No robots.txt or agents.txt present
Citations
- —The endpoint returns a 402 x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/wire/20
- —maxAmountRequired is 20000 base units of USDC (0.02 USD) with asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/20
- —The site advertises $0.02/request pricing 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
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs