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" via the x402 payment protocol. The specific resource path `/api/v1/messages/178` suggests a messages or content retrieval endpoint, though the exact payload and functionality are not documented beyond the generic label. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (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 no minimum commitments required. However, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no additional technical documentation, schemas, or usage examples.
Because the specific endpoint `/api/v1/messages/178` does not appear in the site's published API catalog and no request/response schema is documented, the actual behavior and output of this particular resource remain unclear. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepting payments.
Capabilities
Use cases
- —Accessing premium content or messages behind a micropaywall
- —Agent-driven API consumption with per-call USDC payments on Base
- —Programmatic access to paid resources without API key registration
Fit
Best for
- —Agents or developers wanting keyless, pay-per-call API access
- —Users who prefer crypto micropayments over subscription billing
- —Quick one-off requests where $0.02/call is acceptable
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume use cases where per-call pricing becomes expensive
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/178 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no documentation for this specific endpoint (/api/v1/messages/178), no request/response schema, no examples, and the site's docs pages are empty. The endpoint path doesn't match any listed API on the site's catalog, making its purpose unclear.
Warnings
- —The endpoint /api/v1/messages/178 does not appear in the provider's published API catalog — its purpose is undocumented.
- —All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no technical content.
- —No request body schema or response schema is available; actual behavior is unknown.
- —The broader platform lists many API categories but none have detailed documentation.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/messages/178
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —Documentation pages /api, /pricing, and /README returned only a 'Connect wallet' prompt.https://lowpaymentfee.com/api