Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to each request.
The specific endpoint at `/api/v1/wire/15` is listed as "Premium API Access." Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. However, the exact functionality behind this particular path (`/wire/15`) is not documented on the site — the landing page catalogs other endpoints (analytics, AI, finance, utils) but does not mention the `/wire/` namespace. It may be a generic or internal route.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to require a wallet connection and returned no substantive content during crawl.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call crypto payment
- —AI agents consuming inference endpoints (sentiment, summarization, embeddings) via x402
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents with USDC on Base that need frictionless endpoint consumption
- —Prototyping and low-volume use cases where $0.02/call is cost-effective
Not for
- —High-volume production workloads where per-call pricing adds up quickly
- —Users without USDC on Base or unfamiliar with x402 payment protocol
- —Anyone needing detailed documentation — docs pages are currently empty or wallet-gated
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/15 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>" \
-d '{}'Example
Request
{}Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific /wire/15 path has no documentation, no request/response schema, and no examples. The broader site's docs pages are wallet-gated and returned no content. The actual functionality behind this endpoint is unknown.
Warnings
- —The /api/v1/wire/15 path is not listed among the site's documented endpoints — its purpose is unclear
- —All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no substantive content
- —No request or response schema is available for this endpoint
- —The broader platform lists many endpoint categories but none match the /wire/ namespace
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/15
- —The site lists endpoints at $0.02/request across data analytics, AI/ML, finance, and infrastructure categorieshttps://lowpaymentfee.com
- —Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com