Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.
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/messages/152` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header containing a signed x402 payment.
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/request price point.
However, the specific functionality of the `/api/v1/messages/152` endpoint is unclear. The path suggests a messages resource (possibly a content or messaging endpoint), but no documentation, request schema, or response schema is available beyond the generic "Premium API Access" label. The endpoint is confirmed live via a valid 402 challenge, accepts POST requests, and returns application/json. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.
Capabilities
Use cases
- —Accessing premium API content with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 protocol integrations on Base network
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can sign x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
- —High-volume use cases where subscription pricing would be cheaper
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/152 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for the specific /api/v1/messages/152 endpoint — no request schema, no response schema, no examples, and no explanation of what 'Premium API Access' actually returns. The crawled pages beyond the homepage were empty (wallet-connect gates).
Warnings
- —No documentation available for the /api/v1/messages/152 endpoint — its actual functionality is unknown
- —No request or response schema provided; callers must guess at the POST body format
- —Most site pages (pricing, README, API docs) are gated behind a wallet-connect flow and returned no content
- —The 'messages/152' path suggests a specific resource ID — unclear if this is a static resource or a dynamic endpoint
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/messages/152
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/messages/152
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com