Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set 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, settled in USDC on the Base network via the x402 payment protocol.
The specific endpoint at `/api/v1/wire/31` is listed as "Premium API Access" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated entirely by per-request micropayment.
Documentation is extremely sparse — the /docs, /pricing, /api, 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 crawled material. The purpose of the `/api/v1/wire/31` endpoint specifically is unclear; it may be a generic premium access route or a specific wire-transfer-related endpoint. Without documentation, callers will need to experiment with POST payloads to discover the expected input format and response structure.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment
- —Running data analytics queries and exporting data on a per-request payment basis
- —Using utility services like geocoding and validation without subscription commitments
Fit
Best for
- —Agents or developers who want instant, keyless API access via crypto micropayments
- —Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions
- —Web3-native applications already operating on the Base network with USDC
Not for
- —High-volume production workloads where $0.02/request adds up significantly without bulk discounts
- —Developers who need detailed API documentation, SDKs, or guaranteed SLAs before integrating
Quick start
# Pay $0.02 in USDC on Base per request via x402
curl -X POST https://lowpaymentfee.com/api/v1/wire/31 \
-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, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/wire/31 is undocumented. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found for any endpoint
- —The specific purpose and expected input/output of /api/v1/wire/31 ('Premium API Access') is undocumented and unclear
- —Cannot verify what data or functionality any of the listed endpoints actually return
Citations
- —All endpoints 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/31 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/wire/31
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com