Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required. The x402 payment protocol handles authentication and billing inline: callers attach a cryptographic payment header and receive the response immediately.
The specific endpoint at `/api/v1/messages/86` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The platform also 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 for any endpoint, including this one. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. Without schemas or sample payloads, it is unclear what request body this endpoint expects or what it returns.
Capabilities
Use cases
- —Agent-initiated API calls with inline USDC micropayments
- —Accessing premium content or data behind a per-request paywall
- —Testing x402 payment protocol integrations on Base
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can sign USDC transactions on Base
- —Low-volume, pay-as-you-go API consumption without subscriptions
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who need bulk pricing or rate guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/86 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The purpose of '/api/v1/messages/86' specifically is entirely opaque.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —No request body or response format documented — callers must guess the payload
- —Docs, pricing, and README pages return no useful content (only 'Connect wallet')
- —The specific function of /api/v1/messages/86 ('Premium API Access') is unclear and may be a generic placeholder
- —Cannot verify what data or service is actually returned after payment
Citations
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/messages/86
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/messages/86
- —Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com