Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/3` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
The broader platform offers endpoints across four 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 endpoints are priced at $0.02 per request.
However, the documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a "Connect wallet" prompt with no actual technical documentation, schemas, or usage examples. The specific functionality behind `/api/v1/wire/3` ("Premium API Access") is not described anywhere in the crawled material, making it unclear what data or service this particular endpoint returns. Without request/response schemas or documentation, integrating this endpoint requires experimentation.
Capabilities
Use cases
- —Accessing premium API services with per-call USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Developers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/3 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, and no description of what /api/v1/wire/3 actually returns. All doc pages show only 'Connect wallet' with no content. The listing is effectively a stub.
Warnings
- —No documentation available — all doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no technical content.
- —The specific functionality of /api/v1/wire/3 ('Premium API Access') is undocumented; it is unclear what data or service it provides.
- —No request or response schemas are available; integration requires trial and error.
- —The platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/wire/3
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages return only 'Connect wallet' with no technical contenthttps://lowpaymentfee.com/docs