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 platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/wire/64` is listed as "Premium API Access." Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The platform's landing page lists 16 endpoints across four categories (analytics/metrics, AI sentiment/summarization/classification/embeddings, finance price feeds/exchange rates/crypto quotes/gas estimates, and geocoding/validation/conversion/generation), all at the same $0.02 price point. However, documentation pages beyond the landing page returned only a "Connect wallet" stub, so detailed request/response schemas, parameter descriptions, and example payloads are not available. The exact functionality behind `/api/v1/wire/64` is unclear — it may be a generic wire or proxy endpoint rather than one of the named services.
Capabilities
Use cases
- —Agent-driven data retrieval with automatic per-call USDC payment
- —On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment
- —Geocoding or data validation as a lightweight utility call
Fit
Best for
- —AI agents that need frictionless, keyless API access with crypto micropayments
- —Developers prototyping integrations who want zero-commitment, pay-as-you-go pricing
- —Web3 applications already operating on the Base network with USDC liquidity
Not for
- —High-volume production workloads where $0.02/request adds up (no bulk discount documented)
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs
- —Callers without USDC on Base or without x402 payment infrastructure
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/64 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a 'Connect wallet' stub. The specific purpose of /api/v1/wire/64 is undocumented. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no usable content.
- —The exact functionality of /api/v1/wire/64 ('Premium API Access') is not described anywhere — it does not match any of the 16 named endpoints on the landing page.
- —No request or response schemas are available; callers cannot determine what parameters to send or what data to expect.
- —No rate limit, SLA, or uptime guarantees documented.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/wire/64
- —Platform offers 16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com