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/35/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 35. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.

The endpoint is live and responds with a 402 challenge requiring an X-PAYMENT header. The x402 challenge specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by micropayment.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example of the response payload. The endpoint path suggests it returns performance metrics for a specific portfolio (ID 35), but the exact fields, time ranges, and input parameters are unknown. The platform lists many other endpoints at $0.02 each across finance, AI, and utility categories, but details for those are equally undocumented.

Capabilities

x402-paymentusdc-baseportfolio-performancepay-per-requestno-api-keymicropayment

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or trading bots
  • —Agent-driven portfolio monitoring with per-request micropayments

Fit

Best for

  • —Developers needing on-demand portfolio performance data without subscriptions
  • —AI agents that can settle x402 micropayments on Base
  • —Users who want keyless, pay-as-you-go API access

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before integrating
  • —Anyone who cannot transact USDC on the Base network
  • —Bulk data consumers who need flat-rate or subscription pricing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/35/performance \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/35/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 description of what data is actually returned. The listing is effectively a stub.

Warnings

  • —No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt
  • —No OpenAPI or input/output schema provided; request parameters and response format are unknown
  • —The specific endpoint is for portfolio ID 35 only; unclear if other portfolio IDs are supported or what portfolio 35 represents
  • —Platform appears to be a generic x402 demo site with many listed endpoints but no substantive documentation for any of them

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:32:58Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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