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/41/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 41) as JSON. It is part of a broader platform offering data, analytics, AI, finance, and utility APIs, all gated behind the x402 payment protocol on the Base network using USDC.

The endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment settles on-chain to a specified address on Base. The platform advertises no API keys, no rate limits, and instant access — you pay per call with no subscription or commitment.

Documentation is extremely sparse. The landing page lists many endpoints across categories (analytics, AI/ML, finance/Web3, infrastructure) all at the same $0.02 price point, but no detailed schema, request parameters, or response examples are provided for any of them. The /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. The specific portfolio performance endpoint is not listed on the homepage, suggesting it may be an unlisted or specialized route. Without documentation on request body format or response structure, callers will need to experiment or contact the provider.

Capabilities

x402-paymentportfolio-performanceusdc-basemicropaymentjson-apiper-request-billing

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio analytics into agent workflows with per-call payment
  • —Accessing financial data without API key registration

Fit

Best for

  • —Agents needing on-demand portfolio performance data with no signup
  • —Developers prototyping x402 payment flows against a live endpoint
  • —Users who want pay-per-use financial data without subscriptions

Not for

  • —Users needing detailed API documentation or response schema before integrating
  • —High-volume consumers who need bulk pricing or rate-limited guarantees
  • —Anyone requiring historical portfolio data across many portfolio IDs (only ID 41 is known)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/41/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/41/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 documentation on request parameters, response schema, or what 'portfolio 41 performance' actually returns. The docs pages are empty. This is effectively a stub listing.

Warnings

  • —No API documentation available — /docs, /pricing, /api, and /README all return only a wallet connect prompt with no content
  • —No request body schema or response schema documented; callers must guess or reverse-engineer
  • —This specific endpoint (/portfolios/41/performance) is not listed on the provider's homepage among advertised APIs
  • —The platform lists many diverse endpoints (AI, analytics, finance, utilities) all at $0.02 — unclear whether all are fully implemented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:34:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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