x402basequality 0.30

Portfolio performance data via x402 micropayment on Base network for $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/30/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 30. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint `/api/v1/portfolios/30/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 given USDC's 6 decimal places. Payment is made via the `X-PAYMENT` header using the x402 "exact" scheme. No API keys or rate limits are required — access is granted purely through per-call micropayment.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no description of request parameters, and no example of the response payload. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual data returned — what "portfolio 30 performance" contains, what time ranges or metrics are included — is unknown from available materials.

Capabilities

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

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or agent workflows
  • —Programmatic access to portfolio returns without subscription or API key

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data with no signup
  • —Developers exploring x402 micropayment-based API access on Base
  • —Low-volume consumers who prefer pay-per-call over subscriptions

Not for

  • —Users needing detailed API documentation or schema guarantees before integration
  • —High-frequency bulk data retrieval where per-call pricing adds up
  • —Anyone requiring customizable portfolio IDs (this endpoint is hardcoded to portfolio 30)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/30/performance \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/30/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data is actually returned. The portfolio ID 30 is hardcoded in the URL with no context. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all return only a wallet connect prompt
  • —No OpenAPI or request/response schema provided; request parameters and response format are unknown
  • —The endpoint is specific to portfolio ID 30 with no explanation of what this portfolio represents
  • —Platform appears to be a generic multi-category API host; quality and reliability of underlying data sources is unverifiable

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:31:02Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/x3DeBE
Portfolio performance data via x402 micropayment on Base network for $0.02/request. — Clawmart · Clawmart