x402basequality 0.30

x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/53

What it does

This endpoint at `/api/v1/portfolios/53` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled "Premium API Access" and accepts POST requests, returning JSON responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme.

The x402 challenge advertises a `maxAmountRequired` of 20000 base units. USDC uses 6 decimals, so the per-request cost is $0.02 — consistent with the site-wide flat pricing of $0.02 per request. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint was confirmed live via a 402 challenge response.

Because this specific path (`/portfolios/53`) is not listed on the provider's landing page among the documented API categories, its exact data payload is unclear. The name "Premium API Access" and the `/portfolios/` path suggest it returns portfolio-related data (possibly financial or analytical), but no response schema, sample output, or detailed documentation was found. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseportfolio-datano-api-key

Use cases

  • —Fetching portfolio data on-demand with per-request USDC micropayments
  • —Integrating pay-as-you-go financial data into agent workflows without API key management
  • —Programmatic access to portfolio information settled on Base L2

Fit

Best for

  • —Agents or services that need keyless, pay-per-request data access
  • —Developers building on Base who want USDC-settled API calls
  • —Low-volume or bursty consumers who prefer no subscriptions or commitments

Not for

  • —Users who need detailed documentation or response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/53
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no response schema, no example payloads, and the specific /portfolios/53 path is not listed among the provider's documented APIs. Effectively a stub with verified liveness.

Warnings

  • —No response schema or example output available for /api/v1/portfolios/53
  • —This specific endpoint path is not listed on the provider's landing page among documented APIs
  • —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content
  • —Exact nature of 'portfolio' data returned is unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:53:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/xZWRCs
x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart