Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or upfront commitments required.
The specific endpoint at `/api/v1/messages/78` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. The exact functionality behind the `/api/v1/messages/78` path is unclear from available materials.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Programmatic access to premium content or services with per-call USDC micropayments
- —Testing x402 payment flows on Base network
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited plans
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/78 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The purpose of /api/v1/messages/78 specifically is unknown. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically
- —The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')
- —The specific function of /api/v1/messages/78 ('Premium API Access') is not described anywhere in crawled materials
- —No request body schema or response format documented
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/messages/78
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/messages/78
- —Platform lists endpoints for analytics, AI/ML, finance, and infrastructure categorieshttps://lowpaymentfee.com