x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/portfolios/46` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific `/portfolios/46` resource is listed under "Premium API Access" but its exact response payload is undocumented — the crawled site provides no schema or example output for this particular route.
Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. The endpoint accepts POST requests, requires no API key, and advertises no rate limits. The x402 version is 1, with a payment timeout of 300 seconds.
The broader lowpaymentfee.com platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, the docs, pricing, and API pages returned only a "Connect wallet" prompt with no further documentation, so the actual capabilities and response formats of these endpoints (including this one) remain unverified.
Capabilities
Use cases
- —Fetching portfolio data on-demand with per-request USDC micropayments
- —Agent-driven data retrieval without pre-registration or API keys
- —Programmatic access to premium content gated behind x402 payment challenges
Fit
Best for
- —Agents or scripts that need keyless, pay-as-you-go API access
- —Developers experimenting with x402 protocol integrations on Base
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/46 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no response schema, no example payloads, and no explanation of what 'portfolios/46' actually returns. The docs/pricing/API pages are all blank beyond a wallet-connect prompt.
Warnings
- —No documentation available for this specific endpoint — response schema and payload are unknown
- —All non-homepage pages (docs, pricing, API, README) returned only 'Connect wallet' with no content
- —The purpose of '/api/v1/portfolios/46' is unclear — 'Premium API Access' is a generic label
- —No OpenAPI spec or AI plugin manifest found
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/46
- —USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/46
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com