Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.
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 utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.
The specific endpoint at `/api/v1/transfers/87` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform includes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.
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 descriptions of what each endpoint actually returns. The x402 challenge confirms the endpoint is live and accepting payment, but the actual functionality behind `/api/v1/transfers/87` specifically is unclear from available materials.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis
- —Running geocoding, validation, or data conversion tasks with instant pay-per-use billing
- —Integrating pay-as-you-go data analytics and reporting into agent workflows
Fit
Best for
- —Agents or developers who want zero-signup, pay-per-call API access
- —Use cases requiring low-cost micropayments per request ($0.02)
- —Projects already operating on the Base network with USDC
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume workloads where per-request crypto payment overhead is impractical
- —Users without access to USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The specific purpose of /api/v1/transfers/87 is undocumented beyond the generic 'Premium API Access' label.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content
- —No OpenAPI or schema available — request and response formats are unknown
- —The specific functionality of /api/v1/transfers/87 ('Premium API Access') is not described anywhere
- —The broad catalog of endpoints listed on the homepage cannot be independently verified for functionality
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transfers/87
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/87
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com