Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/resource/47`) is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing. However, this listing covers only `/api/resource/47`, whose specific functionality is not documented beyond the generic "Premium API Access" label.
The endpoint is live and returns a well-formed x402 challenge (version 1, scheme "exact"). Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API calls settled on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —AI agents that need keyless pay-per-use API access
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
- —High-volume use cases where $0.02/request adds up without bulk discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/47 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the actual functionality behind '/api/resource/47' is completely undocumented. No OpenAPI spec, no request/response schemas, no examples, and all documentation pages render only 'Connect wallet'. The listing is effectively a stub with confirmed liveness and pricing.
Warnings
- —The specific functionality of /api/resource/47 is unknown — 'Premium API Access' is a generic label with no further documentation.
- —All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI spec or request/response schema is available; callers cannot know what to send or expect back.
- —The broader site lists many endpoint paths (e.g. /api/v1/analytics/metrics, /api/v2/ai/sentiment) but this endpoint (/api/resource/47) does not match any of them, raising questions about what it actually does.
Citations
- —Endpoint returns a valid x402 challenge with version 1, scheme 'exact', on Base networkhttps://lowpaymentfee.com/api/resource/47
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/resource/47
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no technical contenthttps://lowpaymentfee.com/docs