x402basequality 0.35

Retrieve portfolio holdings 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/52/holdings

What it does

This endpoint at lowpaymentfee.com returns holdings data for portfolio #52 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The provider site (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced at $0.02 per request on the Base network. This specific endpoint sits under the Finance & Web3 category and appears to serve portfolio-level holdings information, though the exact response schema is not documented.

Because the crawled documentation pages (docs, pricing, README) all resolve to a minimal "Connect wallet" prompt with no further content, there is no published OpenAPI spec, no response schema, and no example payloads available. The endpoint is confirmed live (402 challenge captured), but the lack of documentation means callers must discover the request/response format experimentally.

Capabilities

x402-paymentportfolio-holdingsusdc-basepay-per-callno-api-keyno-rate-limit

Use cases

  • —Fetching current holdings for a specific portfolio programmatically
  • —Integrating portfolio data into trading bots or dashboards
  • —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
  • —Low-volume or sporadic portfolio data lookups without subscription commitments

Not for

  • —High-frequency bulk data retrieval where per-call costs add up
  • —Users who need detailed API documentation or guaranteed SLAs before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/52/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/52/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 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 response schema, no request body documentation, and all doc pages are empty stubs. The purpose of 'portfolio 52 holdings' is unexplained. This is effectively a stub listing.

Warnings

  • —No OpenAPI or response schema available — request/response format is undocumented
  • —All documentation pages (/docs, /pricing, /README) return only a 'Connect wallet' prompt with no content
  • —The specific meaning of portfolio #52 is not explained anywhere in the crawled material
  • —No examples of successful responses are available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:34:46Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/Br5e9z
Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart