x402basequality 0.30

Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/28/performance

What it does

This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 28) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).

The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility/infrastructure services — all priced at $0.02 per request. The specific endpoint `/api/v1/portfolios/28/performance` is not listed on the provider's landing page catalog, but it is live and returns a valid x402 challenge. No API keys or rate limits are advertised; access is instant upon payment.

Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. 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 captured), but the actual data returned after payment is unknown.

Capabilities

x402-paymentusdc-base-networkportfolio-performancejson-apimicropaymentpay-per-request

Use cases

  • —Retrieving performance metrics for portfolio #28 via a single micropayment
  • —Programmatic portfolio performance monitoring by AI agents with USDC on Base
  • —Integrating pay-per-call portfolio data into dashboards without API key management

Fit

Best for

  • —Agents or apps that need on-demand portfolio performance data without subscription commitments
  • —Developers experimenting with x402 micropayment-gated APIs
  • —Users who prefer crypto-native pay-per-request pricing over traditional API keys

Not for

  • —Users needing detailed API documentation or response schema before integrating
  • —Bulk or high-frequency consumers who would benefit from subscription pricing
  • —Anyone requiring portfolio data for IDs other than 28 (only this ID is confirmed)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/28/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/28/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, and no description of the data returned. The specific portfolio endpoint isn't even listed in the provider's own catalog. Score reflects a confirmed-live but undocumented stub.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or response schema provided; the structure of the response after payment is unknown
  • —This specific endpoint (/api/v1/portfolios/28/performance) is not listed in the provider's public API catalog
  • —Cannot verify what data is actually returned after successful payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:23:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/a6Vn8x
Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC. — Clawmart · Clawmart