x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.
What it does
lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of pay-per-call endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol on the Base network, accepting USDC (USD Coin) for each request. The specific endpoint at `/api/v1/benefits/100` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.
The platform advertises a uniform $0.02-per-request pricing model with no API keys, no rate limits, no minimums, and no commitments. Endpoints span categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the crawled documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas, supported parameters, and output formats for this specific endpoint are unknown.
The endpoint is live and responds with a well-formed x402 v1 challenge. Payment is settled on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The method is POST and the timeout is 300 seconds.
Capabilities
Use cases
- —Accessing premium API features with per-call USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Exploring x402 payment protocol integrations for pay-as-you-go services
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —AI agents that need frictionless, keyless API access
- —Users who want to avoid subscriptions and pay only per request
Not for
- —Users who need detailed API documentation or well-defined schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/benefits/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, and no information about what the /api/v1/benefits/100 endpoint actually returns. The listing is effectively a stub with pricing and protocol details only.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no technical content.
- —No request or response schema is published for this endpoint; input parameters and output format are unknown.
- —The purpose of /api/v1/benefits/100 ('Premium API Access') is vague and not explained anywhere in the crawled material.
- —The broader platform lists many endpoints but none have documented schemas or example payloads.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/benefits/100
- —Uniform $0.02 per request pricing with no API keys, no rate limits, no minimums.https://lowpaymentfee.com
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/benefits/100
- —Payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.https://lowpaymentfee.com/api/v1/benefits/100