Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities 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/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/22` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented in the crawled material.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key provisioning
- —Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment
- —Running geocoding or data validation as a utility service from an autonomous agent
- —Exporting analytics data or generating reports with no subscription commitment
Fit
Best for
- —AI agents that need diverse utility endpoints behind a single payment protocol
- —Developers wanting zero-setup, keyless API access on Base
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Callers without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no response examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of this specific '/api/v1/transactions/22' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub listing.
Warnings
- —All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no actual content
- —No OpenAPI or schema available — request and response formats for this endpoint are unknown
- —The specific purpose of /api/v1/transactions/22 ('Premium API Access') is not explained anywhere in the crawled material
- —The broader platform lists many endpoints but none have documented input/output schemas
Citations
- —Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/22
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/22
- —Platform offers endpoints across analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com