x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/68

What it does

This endpoint at `/api/v1/portfolios/68` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific `/portfolios/68` resource is listed under "Premium API Access" but its exact data payload is not documented in the available crawl material. It accepts POST requests and returns `application/json`.

Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD — consistent with the site's advertised flat $0.02/request pricing across all endpoints. No API keys, subscriptions, or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02/request price point. Documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a "Connect wallet" prompt), so the exact request/response schema for this portfolio endpoint is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-apiportfolio-data

Use cases

  • —Fetching portfolio data on-demand without API key registration
  • —Agent-driven portfolio lookups settled instantly via x402 USDC micropayments
  • —Integrating low-friction paid data endpoints into automated workflows

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 payments on Base
  • —Users who need occasional portfolio data without committing to a subscription

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/68 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/68
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of the request body schema, response format, or what 'portfolios/68' actually returns. Docs pages are empty. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, pricing, and README pages all show only 'Connect wallet'
  • —Request body schema for POST is unknown; no OpenAPI spec provided
  • —Response schema and actual data content of /portfolios/68 are undocumented
  • —The specific meaning of 'portfolios/68' (what portfolio, whose data) is not explained anywhere in crawled material

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:48:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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