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" behind an x402 paywall settled in USDC on the Base network. The specific resource path `/api/v1/messages/164` suggests a messages or content retrieval endpoint, though the exact payload and functionality are not documented beyond the generic "Premium API Access" label.
The provider's landing page advertises a broad suite of APIs spanning data & analytics, AI/ML (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 listed at $0.02 per request with no API keys, no rate limits, and instant access. The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02 — consistent with the advertised pricing.
The endpoint is live and returns a valid x402 challenge on POST. However, there is no OpenAPI schema, no detailed documentation, and no example request/response bodies available. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal "Connect wallet" prompt with no additional content. The specific behavior of the `/api/v1/messages/164` path — what input it expects and what it returns — is unknown from the available material.
Capabilities
Use cases
- —Accessing premium content or messages behind a per-call USDC paywall
- —Agent-driven API consumption without API keys or subscriptions
- —Programmatic pay-per-use access to various data and utility endpoints
Fit
Best for
- —Agents or developers wanting keyless, pay-per-call API access
- —Users who prefer crypto micropayments over subscription billing
- —Quick one-off API calls without account setup
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume use cases where per-call pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/164 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of /api/v1/messages/164 is unclear. The crawled pages beyond the landing page are empty stubs.
Warnings
- —No API documentation or OpenAPI schema available
- —The specific functionality of /api/v1/messages/164 is undocumented — 'Premium API Access' is generic
- —All secondary pages (/api, /pricing, /README) returned only a 'Connect wallet' stub with no content
- —No example request or response bodies could be determined
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/messages/164
- —All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The provider advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com