Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: 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 are priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/wire/114` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to the specified payTo address, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.
Documentation beyond the landing page 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the "Premium API Access" label at `/api/v1/wire/114` is unclear; it does not map to any of the named endpoints listed on the homepage. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or direct contact with the provider.
Capabilities
Use cases
- —Agent-driven data retrieval with per-call USDC micropayments
- —On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto prices, gas estimates, and exchange rates via pay-as-you-go calls
- —Geocoding and data validation as utility microservices
Fit
Best for
- —AI agents that need keyless, pay-per-use API access
- —Developers wanting to avoid subscription commitments for low-volume API usage
- —Web3-native applications already operating on Base with USDC
Not for
- —High-volume production workloads needing guaranteed SLAs and detailed documentation
- —Users without USDC on Base or unfamiliar with x402 payment flows
- —Applications requiring well-documented request/response schemas before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/114 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/wire/114 ('Premium API Access') is undocumented and does not correspond to any named endpoint on the homepage.
Warnings
- —No documentation available beyond the landing page — /docs, /pricing, /api, /README all render only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The endpoint path /api/v1/wire/114 does not match any of the named endpoints listed on the homepage; its actual functionality is unknown
- —No request body schema or response schema is documented anywhere
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/wire/114 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/114
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com