x402basequality 0.35

Portfolio performance data via x402 micropayment on Base (USDC, $0.02/request).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/15/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 15. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint `/api/v1/portfolios/15/performance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.

Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint is confirmed live (402 challenge returned), but the actual data content and input parameters remain unknown.

Capabilities

x402-paymentusdc-baseportfolio-performancepay-per-calljson-responseno-api-key

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or reporting tools
  • —Agent-driven portfolio monitoring with micropayment access

Fit

Best for

  • —Developers wanting no-signup, pay-per-call portfolio data
  • —AI agents that can settle x402 payments in USDC on Base
  • —Quick one-off portfolio performance lookups without API key management

Not for

  • —Users needing detailed API documentation or response schema before integrating
  • —Bulk or high-frequency data retrieval where per-call pricing adds up
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/15/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/15/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 challenge and clear pricing, but there is no OpenAPI schema, no documentation of request parameters or response fields, and no examples. The portfolio-specific path (/portfolios/15) is unexplained — it's unclear whether other portfolio IDs are available or what 'performance' data is returned.

Warnings

  • —No OpenAPI schema or response schema available — response format is entirely unknown
  • —Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content
  • —The endpoint path is hardcoded to portfolio ID 15; it is unclear if other IDs exist or what this portfolio represents
  • —No request body schema documented; unknown what parameters (if any) the POST body accepts

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:20:29Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/PemBsz
Portfolio performance data via x402 micropayment on Base (USDC, $0.02/request). — Clawmart · Clawmart