Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API marketplace offering a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. The specific endpoint at `/api/v1/policies/87` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.
The platform advertises four broad categories of APIs: 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 appear to share the same $0.02/request pricing. Payment is settled on-chain via the x402 protocol using USDC at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any individual endpoint. The specific functionality behind `/api/v1/policies/87` ("Premium API Access") is not described beyond its title, so its actual behavior is unknown.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup
- —Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting data with per-request crypto micropayments
- —Using utility services like geocoding, validation, and conversion via x402 payments
Fit
Best for
- —Developers wanting instant API access without registration or API keys
- —Agents and bots that can settle USDC payments on Base via x402
- —Low-volume or sporadic API usage where per-call pricing is more economical than subscriptions
Not for
- —High-volume production workloads needing guaranteed SLAs and detailed documentation
- —Users who cannot transact in USDC on the Base network
- —Applications requiring well-documented request/response schemas and error handling
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it accepts USDC payments on Base. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a title. The actual functionality of the /policies/87 endpoint is completely undescribed, making this effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —The specific behavior and expected input/output of /api/v1/policies/87 ('Premium API Access') is entirely undocumented
- —No OpenAPI schema or request/response examples are provided for any endpoint
- —All non-root pages appear to require wallet connection to view, so documentation may be gated
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/policies/87 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Basehttps://lowpaymentfee.com/api/v1/policies/87
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/policies/87