x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/33

What it does

This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 33) via the x402 payment protocol. It is part of a broader platform that offers data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all gated behind per-request USDC micropayments on the Base network.

The endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises no API keys, no rate limits, and instant access — you pay per call and that's it.

The specific portfolio resource at `/api/v1/portfolios/33` is labeled "Premium API Access" but no further documentation describes the schema of the response or what portfolio data is returned. The docs, pricing, API, and README pages on the site all render only a "Connect wallet" prompt with no additional content. Without an OpenAPI spec, response examples, or detailed documentation, the exact shape and utility of the returned data remain unclear. The platform hosts many other endpoints across analytics, AI, finance, and utility categories, all at the same $0.02 price point.

Capabilities

x402-paymentusdc-micropaymentbase-networkper-request-billingno-api-keyjson-responseportfolio-data

Use cases

  • —Fetching portfolio data without managing API keys or subscriptions
  • —Agent-driven data retrieval with inline USDC micropayments on Base
  • —Integrating pay-per-request portfolio lookups into automated workflows

Fit

Best for

  • —Developers wanting zero-friction, keyless API access via crypto micropayments
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer pay-as-you-go pricing with no commitments

Not for

  • —Users who need detailed documentation or response schema guarantees before integrating
  • —Anyone without a Base-compatible USDC wallet or x402 client
  • —High-volume consumers who need bulk/subscription pricing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/33 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/33
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example responses, and the documentation pages are empty stubs. The purpose of 'portfolios/33' is entirely opaque beyond the generic label 'Premium API Access'.

Warnings

  • —No OpenAPI or schema documentation available — response format is unknown
  • —All doc/pricing/README pages return only a 'Connect wallet' prompt with no content
  • —The specific meaning of 'portfolios/33' is undocumented; it is unclear what data is returned
  • —No response examples exist in the crawl material

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:31:57Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

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