Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 71) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call. This particular endpoint sits under the finance category and appears to return performance metrics for a given portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no examples of what the response payload looks like. The endpoint is confirmed live (402 challenge returned successfully), but the actual data content and request parameters are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or agent workflows
- —On-demand portfolio analytics without subscription commitments
Fit
Best for
- —Agents or apps needing one-off portfolio performance lookups
- —Developers wanting key-less, pay-per-call finance data on Base
- —Prototyping portfolio analytics without upfront API subscriptions
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-frequency bulk data retrieval where per-call pricing adds up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/71/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and no description of what 'portfolio 71 performance' actually returns. The listing is essentially a stub with only pricing and liveness confirmed.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.
- —No OpenAPI or schema describing request parameters or response format.
- —The specific portfolio ID (71) is hardcoded in the URL; unclear if other portfolio IDs are available or what data is returned.
- —The provider site lists many endpoints but none have documented schemas or examples.
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/portfolios/71/performance
- —Provider advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/71/performance