Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/160` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's `X-PAYMENT` header.
The wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing.
Important caveats: the specific `/api/v1/inbox/160` endpoint's purpose is unclear — it does not match any of the named endpoints on the landing page, and no OpenAPI schema, request/response examples, or detailed documentation were found. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content. Treat this listing as a stub until more documentation surfaces.
Capabilities
Use cases
- —Programmatic access to data, AI, finance, or utility endpoints without managing API keys
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Prototyping integrations where per-call pricing avoids subscription commitments
Fit
Best for
- —Developers or agents wanting zero-commitment, pay-as-you-go API access
- —x402-compatible wallets and agents on the Base network
- —Low-volume or bursty workloads where flat subscriptions are wasteful
Not for
- —High-volume production workloads needing SLAs or guaranteed uptime (none documented)
- —Users who need detailed API documentation or schema validation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/inbox/160 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but the specific resource /api/v1/inbox/160 has no documentation, no schema, no examples, and its purpose ('Premium API Access') is generic. The broader site lists many endpoints but provides no request/response specs. Effectively a stub.
Warnings
- —The endpoint path /api/v1/inbox/160 does not correspond to any named endpoint on the landing page; its actual functionality is unknown.
- —No OpenAPI spec, request schema, or response schema is available.
- —Docs, pricing, and README pages returned only 'Connect wallet' with no usable content.
- —No SLA, rate-limit, or uptime guarantees are documented.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/inbox/160
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/inbox/160