x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/47

What it does

This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (`/api/v1/portfolios/47`) via the x402 payment protocol. The endpoint is live and returns a standard 402 challenge requesting payment in 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, meaning each call requires a one-shot micropayment with no API keys, subscriptions, or rate limits.

The provider, lowpaymentfee.com, hosts a broader catalog of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific `/api/v1/portfolios/47` endpoint is not listed on the provider's homepage catalog, and no documentation describes what data it returns. The crawled docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content.

Because there is no schema, documentation, or example response for this particular endpoint, the actual data returned is unknown. The endpoint is confirmed live (402 challenge captured), accepts POST requests, and returns `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.

Capabilities

x402-paymentusdc-micropaymentbase-networkportfolio-datajson-apino-api-keyper-request-billing

Use cases

  • —Fetching portfolio data with a single USDC micropayment on Base
  • —Agent-driven data retrieval without managing API keys or subscriptions
  • —Programmatic access to portfolio resource 47 via x402 protocol

Fit

Best for

  • —Developers or agents wanting keyless, pay-per-call API access
  • —x402-compatible wallets and agent frameworks on Base
  • —Low-friction one-shot data requests settled in USDC

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/47
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what /api/v1/portfolios/47 actually returns. No OpenAPI schema, no example responses, and the crawled docs pages are empty. The endpoint isn't even listed in the provider's own catalog. This is effectively a stub listing.

Warnings

  • —No documentation or response schema available for /api/v1/portfolios/47
  • —This specific endpoint is not listed on the provider's homepage catalog — its purpose is unclear
  • —All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no content
  • —Cannot verify what data is returned without making a paid request

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:35:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/ebBzC7
x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required. — Clawmart · Clawmart