x402basequality 0.35

Portfolio performance data via x402 micropayment on Base network, $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/50/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 50) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with USDC's 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 broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. This specific endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. However, the exact response schema and input parameters are not documented; the crawled docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further detail.

Because there is no OpenAPI spec, no response schema, and no documentation beyond the landing page listing, the precise fields returned by this endpoint are unknown. Agents should expect a JSON response containing portfolio performance data, but the structure must be discovered empirically after payment.

Capabilities

x402-paymentportfolio-performanceusdc-base-networkpay-per-requestjson-apino-api-key

Use cases

  • —Retrieving performance metrics for a tracked portfolio
  • —Integrating portfolio performance data into dashboards or trading bots
  • —Agents autonomously purchasing financial analytics without API key provisioning

Fit

Best for

  • —Developers wanting frictionless pay-per-call portfolio data
  • —AI agents that can settle x402 payments on Base
  • —Quick one-off portfolio performance lookups without subscription commitments

Not for

  • —Users needing bulk historical portfolio data at scale (no documented batch endpoint)
  • —Anyone requiring detailed API documentation or guaranteed response schemas before integration

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/50/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Example

Request

{
  "url": "https://lowpaymentfee.com/api/v1/portfolios/50/performance",
  "method": "POST",
  "headers": {
    "X-PAYMENT": "<x402-payment-token>",
    "Content-Type": "application/json"
  }
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/50/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no documentation, and no example responses. The docs/pricing/API pages all render only a wallet-connect prompt. This is effectively a stub listing with verified liveness.

Warnings

  • —No OpenAPI or response schema available — response structure is unknown
  • —Documentation pages (docs, pricing, API, README) all returned only 'Connect wallet' with no usable content
  • —The specific portfolio ID (50) is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what they represent
  • —No input body schema documented for the POST request

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:38:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/PHLRUv
Portfolio performance data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart