x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a "portfolios" resource (ID 80) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs 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 endpoint `/api/v1/portfolios/80` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 "exact" scheme to the provider's wallet. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolios resource actually returns. The endpoint name suggests financial portfolio data, but the exact fields and semantics are unknown. Agents should be prepared for an opaque response until better documentation is published.
Capabilities
Use cases
- —Retrieving portfolio data on-demand with per-call USDC micropayments
- —Integrating pay-per-use financial data into autonomous agent workflows
- —Accessing premium data without API key registration or subscriptions
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Developers wanting zero-commitment, pay-per-call data access
- —Prototyping integrations where low per-request cost matters
Not for
- —Users needing well-documented, schema-specified APIs
- —High-volume consumers who need bulk pricing or rate guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/80 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the portfolios/80 resource actually contains. The listing is effectively a stub.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format.
- —The exact nature of the 'portfolios/80' resource is unknown; the name is suggestive but unverified.
- —No request or response examples are available from the provider.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/80
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/80