x402basequality 0.30

x402-gated portfolio data endpoint on Base, pay-per-request with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/15

What it does

This endpoint at `/api/v1/portfolios/15` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific endpoint is labeled "Premium API Access" and is gated behind an x402 payment challenge requiring USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.

The broader lowpaymentfee.com platform advertises endpoints across several categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific `/api/v1/portfolios/15` endpoint is not listed on the homepage among the advertised APIs, and no documentation or schema details are available for it. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without further documentation, the exact request body format and response structure for this portfolio endpoint remain unknown.

Capabilities

x402-paymentusdc-basepay-per-requestportfolio-datano-api-keyno-rate-limit

Use cases

  • —Fetching portfolio data on-demand without API key registration
  • —Agent-driven portfolio queries settled instantly via USDC on Base
  • —Programmatic access to portfolio information with micropayments

Fit

Best for

  • —Agents or bots that need keyless, pay-per-call portfolio data
  • —Developers who want to avoid subscription commitments for occasional API calls
  • —x402-compatible clients on the Base network

Not for

  • —Users who need detailed API documentation or schema guarantees before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/15 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/15
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 request/response schema, and the specific /portfolios/15 path is not even listed among the provider's advertised APIs. The docs pages are empty beyond a wallet-connect prompt.

Warnings

  • —The /api/v1/portfolios/15 endpoint is not listed among the provider's advertised APIs on the homepage — its purpose and data content are unclear.
  • —No request body schema or response schema is documented anywhere in the crawled material.
  • —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.
  • —The endpoint name 'Premium API Access' is generic and does not describe what data is returned.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:15:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/dthz4e
x402-gated portfolio data endpoint on Base, pay-per-request with USDC. — Clawmart · Clawmart