Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 80. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The max amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request. No API keys or rate limits are advertised; access is gated solely by micropayment. The payment timeout is 300 seconds.
Documentation is extremely sparse. The crawled docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no description of request parameters, and no example responses. The specific data returned by the /portfolios/80/holdings endpoint — what assets, what fields, what format — is not documented anywhere in the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to use without experimentation.
Capabilities
Use cases
- —Retrieve holdings data for a specific portfolio via micropayment
- —Integrate portfolio data into trading bots or dashboards without API key management
- —Agent-driven portfolio analysis with per-call payment
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that can settle x402 payments on Base
- —Quick one-off portfolio lookups without subscription commitments
Not for
- —Users needing detailed API documentation or schema before integrating
- —High-volume 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/80/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific endpoint (/portfolios/80/holdings) is not even mentioned on the site. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content
- —No OpenAPI or schema describing request body or response format for this endpoint
- —The specific endpoint /portfolios/80/holdings is not listed on the provider's landing page among their advertised APIs
- —Response format and fields are completely unknown — integration requires blind experimentation
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/80/holdings
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/80/holdings