x402basequality 0.30

x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/8

What it does

This endpoint at `/api/v1/portfolios/8` 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 `/portfolios/8` resource is listed under "Premium API Access" and accepts POST requests, returning JSON. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) via the x402 exact-payment scheme.

The x402 challenge advertises a `maxAmountRequired` of 20000 base units. USDC uses 6 decimals, so this translates to $0.02 per request — consistent with the site's stated flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access. There is no OpenAPI schema, no detailed documentation, and no example request/response bodies available from the crawled pages (docs, pricing, and other pages returned only a "Connect wallet" prompt with no further content).

Because the `/portfolios/8` path is not listed among the site's publicly advertised API categories (data, AI, finance, infrastructure), its exact functionality is unclear. The title "Premium API Access" is generic and does not describe what data or service the endpoint returns. Users should treat this as an opaque JSON endpoint until further documentation is published.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responsepost-method

Use cases

  • —Fetching portfolio data via a single paid POST request
  • —Integrating pay-per-call APIs into agent workflows without API keys
  • —Demonstrating x402 protocol payment flows on Base

Fit

Best for

  • —Developers experimenting with x402 pay-per-request protocols
  • —Agents needing keyless, on-demand API access settled in USDC on Base
  • —Low-volume consumers who prefer per-call pricing over subscriptions

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/8
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 OpenAPI schema, no request/response examples, and no documentation describing what /portfolios/8 actually returns. The crawled docs/pricing/README pages were empty beyond a wallet-connect prompt. The endpoint path itself is not listed among the site's advertised APIs, making its purpose unclear.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The /portfolios/8 path is not listed among the site's publicly advertised API endpoints — its purpose is undocumented
  • —All secondary pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content
  • —No example request or response bodies are available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:01:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/MSaFrS
x402-gated portfolio endpoint on Base, pay-per-call with USDC at $0.02/request. — Clawmart · Clawmart