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/79/performance

What it does

This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 79) via the x402 payment protocol. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is gated purely by the x402 micropayment.

The provider site (lowpaymentfee.com) hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per call. This particular endpoint falls under the finance category and appears to deliver performance metrics for a pre-defined portfolio. However, the exact response schema is not documented — there is no OpenAPI spec, no example responses, and the docs/pricing/README pages behind the site all resolve to a minimal "Connect wallet" prompt with no further detail.

Because the endpoint returned a well-formed 402 challenge with valid x402 version 1 headers, it is confirmed live. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Base mainnet USDC). The maximum timeout for payment settlement is 300 seconds. Without documentation on the request body schema or the response payload structure, callers will need to experiment or contact the provider to understand what fields to send and what data is returned.

Capabilities

x402-paymentportfolio-performanceusdc-base-networkmicropayment-apijson-responseno-api-keypay-per-request

Use cases

  • —Retrieving performance metrics for a specific investment portfolio
  • —Integrating portfolio performance data into dashboards or agent workflows
  • —Paying per-request for financial data without subscription commitments

Fit

Best for

  • —Agents or apps needing on-demand portfolio performance data with no signup
  • —Developers experimenting with x402 micropayment-gated APIs
  • —Low-volume consumers who prefer pay-per-call over subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-frequency trading systems requiring sub-second latency guarantees
  • —Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 79)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/79/performance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/79/performance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the site's docs pages are empty stubs. The purpose of 'portfolio 79 performance' is opaque without further context.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —Response payload structure is completely undocumented
  • —Docs, pricing, and README pages on the provider site contain no useful content beyond 'Connect wallet'
  • —The endpoint is specific to portfolio ID 79 with no explanation of what this portfolio represents
  • —Cannot verify what data is actually returned without making a paid request

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:00:37Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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