Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
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/171` is listed as "Premium API Access" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
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 listed at the same $0.02 per request price point. The platform claims no rate limits, no minimums, and instant access.
However, the specific functionality behind `/api/v1/wire/171` is not documented — the endpoint path does not match any of the named APIs on the landing page, and the description is simply "Premium API Access" with no further detail. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-request payments in USDC on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-as-you-go API access on Base
- —Low-cost per-request API consumption without commitments
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone needing to understand the exact response format before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/171 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/wire/171 is completely undocumented. The docs/pricing/API pages are all empty beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —The specific endpoint /api/v1/wire/171 does not correspond to any named API on the landing page — its actual functionality is unknown.
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, no example responses, and no input schema are available.
- —The platform lists many API categories on its landing page but provides no evidence that any of them return meaningful data.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/wire/171
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —The platform claims no API keys, no rate limits, no minimums, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/wire/171