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/30` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits 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 priced at $0.02 per request.
However, the specific functionality of the `/api/v1/wire/30` endpoint is not documented beyond its title "Premium API Access." The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional technical documentation, schemas, or example payloads. Without documentation on what this endpoint actually returns or what input it expects, callers must discover its behavior experimentally. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Programmatic pay-per-call access to utility or data endpoints settled 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, permissionless API access
- —Low-cost per-request usage without subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone needing to understand the exact response format before calling
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/30 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually does, no request/response schema, no examples, and the docs pages are empty. The name 'Premium API Access' and path '/api/v1/wire/30' give no meaningful indication of functionality.
Warnings
- —No documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/wire/30 is completely undocumented; 'Premium API Access' is not descriptive
- —No request or response schema provided; callers must discover behavior experimentally
- —No OpenAPI spec, no ai-plugin manifest, no agents.txt found
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/wire/30
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/30
- —Multiple API categories listed including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com