x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.
What it does
This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (`/api/v1/portfolios/96`) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind x402 micropayments on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract `0x8335…2913` on Base) with an exact-scheme challenge requiring up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is individually paid for at the time of request. The x402 challenge was confirmed live, returning a proper 402 with version 1 headers and a 300-second payment timeout.
The specific data returned by `/api/v1/portfolios/96` is not documented in the crawled material. The site's landing page groups its APIs into categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), but the portfolios path is not listed among them. Without further documentation or example responses, the exact schema and content of this endpoint remain unknown. The docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no additional technical detail.
Capabilities
Use cases
- —Fetching portfolio data on-demand with per-call USDC micropayments
- —Integrating pay-per-request data access into autonomous agents
- —Accessing premium data without managing API keys or subscriptions
Fit
Best for
- —Agents or bots that need keyless, on-demand API access via crypto micropayments
- —Developers experimenting with x402 payment protocol integrations
- —Use cases where per-call billing is preferred over subscriptions
Not for
- —Users who need detailed documentation or response schema guarantees before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/96 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation for this specific portfolios endpoint, no request/response schema, no example payloads, and the docs pages are empty. The purpose of '/portfolios/96' is entirely undocumented.
Warnings
- —The /api/v1/portfolios/96 path is not listed among the site's advertised API endpoints — its purpose and response format are unknown.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no technical content.
- —No OpenAPI spec, no request schema, and no example responses are available.
- —The specific data returned by this endpoint could not be verified.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/96
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/96
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Site lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com