x402basequality 0.35

Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/13/holdings

What it does

This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 13 via a POST request, gated behind an x402 payment challenge. The endpoint accepts USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.

The provider site (lowpaymentfee.com) hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. However, the specific endpoint being listed here — `/api/v1/portfolios/13/holdings` — is not explicitly documented on the provider's landing page or in any crawled documentation. The endpoint is live and returns a valid x402 challenge, but there is no schema, example request body, or example response available. The description "Premium API Access" is the only metadata provided by the x402 challenge itself.

Because no documentation exists for this specific endpoint beyond the x402 challenge, the exact request body format and response structure are unknown. Callers should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for details on required POST body fields.

Capabilities

portfolio-holdingsx402-paymentusdc-micropaymentbase-networkpay-per-requestjson-api

Use cases

  • —Fetching current holdings for a specific investment portfolio
  • —Programmatic portfolio monitoring by AI agents
  • —Integrating portfolio data into dashboards or analytics pipelines

Fit

Best for

  • —Agents needing on-demand portfolio holdings data without API key management
  • —Micropayment-based access to financial data
  • —Developers prototyping portfolio tracking tools

Not for

  • —Users needing documented request/response schemas before integrating
  • —High-frequency polling where per-request costs accumulate quickly
  • —Accessing portfolios other than ID 13 (only this ID is confirmed live)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/13/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/13/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and the specific portfolio holdings endpoint is not listed on the provider's own landing page. Effectively a stub with confirmed liveness.

Warnings

  • —No documentation exists for /api/v1/portfolios/13/holdings — it is not listed on the provider's landing page among advertised APIs
  • —Request body schema and response format are completely unknown
  • —Only portfolio ID 13 is confirmed; availability of other portfolio IDs is unverified
  • —Provider docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:21:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/5MkEze
Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart