x402basequality 0.30

x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/7

What it does

This endpoint at `/api/v1/portfolios/7` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/7` resource is listed under "Premium API Access" but its exact data payload is not documented beyond the generic description.

The endpoint is live and returns a valid x402 challenge (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json` and the method is POST. No API keys, rate limits, or subscriptions are required — each call is independently settled on-chain.

Documentation is extremely sparse. The landing page lists many endpoints across four categories but provides no request/response schemas, parameter descriptions, or example payloads. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a "Connect wallet" prompt with no additional content. Because of this, the actual data returned by `/api/v1/portfolios/7` cannot be confirmed from available materials.

Capabilities

x402-paymentper-request-billingusdc-baseno-api-keyjson-responseportfolio-data

Use cases

  • —Fetching portfolio data on-demand with per-request USDC micropayments
  • —Agent-driven data retrieval without managing API keys or subscriptions
  • —Integrating pay-as-you-go financial data into automated workflows

Fit

Best for

  • —Developers wanting zero-setup, keyless API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer per-call pricing over monthly subscriptions

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk/subscription pricing
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/7 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/7
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or example payloads for this specific endpoint. The docs/pricing/README pages are all empty beyond a wallet-connect prompt, making it impossible to confirm what data is actually returned.

Warnings

  • —No request or response schema available for /api/v1/portfolios/7
  • —All documentation pages (/docs, /pricing, /README) render only 'Connect wallet' with no content
  • —The purpose and payload of 'Premium API Access' at /portfolios/7 is undocumented — the name is generic
  • —Cannot verify what data is returned without making a paid request

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:48:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/N558pt