x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API marketplace that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/wire/199` is listed as "Premium API Access" and accepts payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises four categories of endpoints: 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 are listed at the same $0.02/request price point. However, the crawled documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so there is no schema documentation, example payloads, or detailed descriptions of what each endpoint actually returns.
Because the endpoint is live (returns a well-formed 402 challenge) and the pricing is clear, it is functional for x402-capable agents. However, the complete lack of input/output schemas, example requests, or documentation beyond the landing page significantly limits usability. Agents would need to discover request formats through experimentation or out-of-band information.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Micropayment-gated premium data or utility access for autonomous workflows
- —Testing x402 payment protocol integrations on Base network
Fit
Best for
- —x402-compatible agents that can sign USDC payments on Base
- —Developers exploring pay-per-call API models without subscriptions
- —Autonomous agents needing keyless, instant API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Agents that cannot settle payments on the Base L2 network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/199 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is zero documentation beyond the landing page listing—no input/output schemas, no example requests or responses, and all doc pages just show 'Connect wallet'. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc/pricing/README pages return only 'Connect wallet'
- —No input or output schema provided for this endpoint
- —The specific purpose of /api/v1/wire/199 ('Premium API Access') is not explained anywhere
- —Cannot verify what data or functionality this endpoint actually returns
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/199
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/199
- —All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categorieshttps://lowpaymentfee.com