x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path `/api/v1/portfolios/86`. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.
The specific `/api/v1/portfolios/86` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (the asset at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the "portfolios/86" resource actually returns. The endpoint name "Premium API Access" is generic and does not clarify the data payload. Based on the site's category groupings (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), this portfolio endpoint likely returns some form of structured data, but the exact schema and semantics are unknown.
Capabilities
Use cases
- —Fetching portfolio data via a single micropayment without API key registration
- —Agent-driven data retrieval with automatic x402 payment flow
- —Programmatic access to portfolio information settled on Base L2
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/86 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint actually returns. No OpenAPI schema, no request body schema, no response examples, and the docs pages are empty. The listing is essentially a stub with only the payment challenge to go on.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No request or response schema provided; the actual data returned by /api/v1/portfolios/86 is completely unknown.
- —The endpoint name 'Premium API Access' is generic and shared across all endpoints on the platform, providing no insight into this specific resource.
- —Cannot verify what 'portfolios/86' refers to — could be financial portfolio data, a demo resource, or placeholder content.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/86
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/86
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com