x402basequality 0.30

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/49/holdings

What it does

This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 49. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all priced at $0.02 per request and settled via x402 using USDC on the Base network.

The specific endpoint `/api/v1/portfolios/49/holdings` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet. No API keys, accounts, or rate limits are advertised — access is purely payment-gated.

Documentation beyond the landing page is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data format of portfolio holdings is unknown and must be discovered by making a paid request.

Capabilities

x402-paymentusdc-baseportfolio-holdingspay-per-requestno-api-keyjson-response

Use cases

  • —Retrieving holdings data for a specific investment portfolio
  • —Integrating portfolio position data into trading dashboards or analytics tools
  • —Agent-driven portfolio monitoring with per-call micropayments

Fit

Best for

  • —Developers wanting keyless, pay-per-call access to portfolio data
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer no-subscription, usage-based pricing

Not for

  • —Users needing detailed API documentation or request/response schemas before integrating
  • —Bulk data retrieval where per-request pricing would be cost-prohibitive
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/49/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-signed-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/49/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned is completely undocumented.

Warnings

  • —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.
  • —No request or response schema is published; callers must discover the payload format by trial.
  • —The endpoint is for a specific portfolio ID (49); it is unclear whether other portfolio IDs are available or how they are discovered.
  • —The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none have visible documentation — the entire site may be a demo or early-stage project.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:33:54Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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