x402-gated API platform on Base offering analytics, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint being listed here (`/api/v1/transactions/20/receipt`) is described as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader platform advertises a uniform $0.02 per request across all its endpoints. Categories of available APIs include: metrics and reports (Data & Analytics), sentiment analysis, text summarization, classification, and embeddings (AI & ML), price feeds, exchange rates, token quotes, and gas estimates (Finance & Web3), and geocoding, validation, conversion, and generation (Infrastructure/Utilities).
Documentation pages (/docs, /pricing, /api, /README) all returned minimal content (just a "Connect wallet" prompt), so detailed request/response schemas, parameter descriptions, and example payloads are not available from the crawl. The endpoint is confirmed live via a valid x402 402 challenge. Payment is settled in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments
- —Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management
- —Accessing utility services like geocoding, validation, and data conversion on a pay-as-you-go basis
- —Retrieving transaction receipts or analytics reports with no subscription commitment
Fit
Best for
- —Agents or developers who want keyless, pay-per-request API access on Base
- —Projects needing low-cost micropayment-gated AI and data endpoints
- —Web3-native applications that prefer on-chain settlement over traditional billing
Not for
- —High-volume production workloads that need guaranteed SLAs and detailed documentation
- —Users who need comprehensive OpenAPI schemas and example payloads before integration
- —Teams that cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/20/receipt \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and pricing is clear ($0.02 USDC on Base). However, all documentation pages returned only 'Connect wallet' with no usable content—no OpenAPI spec, no request/response schemas, no examples. The endpoint path ('transactions/20/receipt') and description ('Premium API Access') are vague and don't clarify what data is returned.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content
- —No OpenAPI or JSON schema available for request or response payloads
- —The specific endpoint path '/api/v1/transactions/20/receipt' is unclear in purpose—'Premium API Access' is generic
- —Cannot verify what actual data or functionality any of the advertised endpoints provide
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Basehttps://lowpaymentfee.com/api/v1/transactions/20/receipt
- —The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/20/receipt