Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API marketplace that offers a variety 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, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint at `/api/v1/wire/172` is listed as "Premium API Access" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts HTTP POST requests and returns application/json responses.
Documentation beyond the landing page is sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind the `/api/v1/wire/172` path is unclear; it does not map to any of the named endpoints listed on the homepage. Agents should be aware that without documented input/output schemas, integration requires experimentation or additional out-of-band information.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment
- —Running utility operations like geocoding or data validation on a per-call billing basis
- —Programmatic data export and analytics without subscription commitments
Fit
Best for
- —AI agents that need keyless, pay-per-call access to diverse API endpoints
- —Developers prototyping with low-commitment, no-signup API access
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-call pricing becomes expensive compared to subscription APIs
- —Use cases requiring detailed SLAs, uptime guarantees, or documented error handling
- —Applications that need well-documented request/response schemas before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/172 \
-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 it accepts payments. However, there is no OpenAPI spec, no request/response schema, no examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The specific wire/172 path is not explained anywhere on the site. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — input/output formats are unknown
- —The /docs, /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')
- —The endpoint path /api/v1/wire/172 does not correspond to any named endpoint on the homepage; its actual functionality is unclear
- —No rate limit or uptime information documented
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Payment is in USDC on the Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/wire/172