x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (ID 85) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 "exact" scheme to a specified wallet address, with no API keys or rate limits required.
The broader lowpaymentfee.com platform hosts a variety of pay-per-call API endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC. However, this specific listing is for the `/api/v1/portfolios/85` endpoint, whose exact response payload is undocumented — the description simply reads "Premium API Access" with a JSON MIME type.
No OpenAPI schema, detailed documentation, or example responses are available for this endpoint. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional content. The nature of the "portfolio" data returned is unclear from available materials.
Capabilities
Use cases
- —Fetching portfolio data on-demand with per-request USDC micropayments
- —Agent-driven data retrieval without API key management
- —Programmatic access to portfolio information via x402 protocol
Fit
Best for
- —Developers or agents wanting keyless, pay-per-call portfolio data access
- —x402-compatible agents that can settle USDC on Base
- —Use cases requiring low-friction, no-subscription API access
Not for
- —Users needing detailed documentation or schema guarantees before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/85 \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation beyond a one-line description, no example request/response, and the portfolio data content is entirely unspecified. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, and API pages render only 'Connect wallet' with no content
- —The exact data returned by /api/v1/portfolios/85 is undocumented; 'Premium API Access' is the only description
- —No OpenAPI or output schema provided beyond mimeType: application/json
- —Cannot verify what 'portfolio' data is served or its accuracy/freshness
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/85
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/portfolios/85
- —All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Platform hosts endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com