x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/portfolios/94` 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/94` resource is listed under "Premium API Access" but its exact data payload is not documented in the available crawl material. The endpoint is live and returns a valid x402 challenge on POST.
Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 "exact" scheme. The `maxAmountRequired` is 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. No API keys are required; access is granted by attaching a valid `X-PAYMENT` header with a signed payment proof. The platform advertises no rate limits and instant access.
Because the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a "Connect wallet" prompt with no substantive content, the actual response schema and the meaning of "portfolios/94" remain unknown. The endpoint could return financial portfolio data, but this is speculative. Agents should treat this as a generic paid JSON endpoint until better documentation surfaces.
Capabilities
Use cases
- —Fetching portfolio-related data via a single micropayment without subscription or API key
- —Integrating pay-per-request data access into autonomous agent workflows
- —Programmatic access to premium content gated behind x402 payment challenges
Fit
Best for
- —Agents or scripts that need one-off data fetches without managing API keys
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume consumers who prefer per-call pricing over subscriptions
Not for
- —High-volume bulk data retrieval where per-call costs add up quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/94 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed_x402_payment_proof>"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 the purpose of '/portfolios/94' is unexplained. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub.
- —The exact data returned by /api/v1/portfolios/94 is unknown; 'Premium API Access' is the only description provided.
- —No OpenAPI spec, no output schema beyond the x402 challenge metadata, and no example responses are available.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/portfolios/94
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/portfolios/94