x402basequality 0.30

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/79

What it does

This endpoint at `/api/v1/portfolios/79` 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/79` resource is listed under "Premium API Access" but its exact data payload is not documented beyond the generic description. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with `maxAmountRequired` of 20000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 `exact` scheme by including an `X-PAYMENT` header. The challenge specifies a 300-second timeout and the response MIME type is `application/json`. The HTTP method is POST.

The broader lowpaymentfee.com platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no explanation of what data the `/portfolios/79` resource actually returns. Without documentation or example responses, the actual utility of this endpoint is unclear.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseno-api-keyportfolio-data

Use cases

  • —Fetching portfolio data (resource ID 79) via a single paid API call
  • —Integrating pay-per-request data access into agent workflows without managing API keys
  • —Demonstrating x402 protocol payment flows on Base

Fit

Best for

  • —Agents or developers who want key-free, pay-per-call API access
  • —x402-compatible clients on the Base network
  • —Low-volume or exploratory data retrieval without subscription commitments

Not for

  • —Users who need detailed documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone needing to understand the exact response schema before paying

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/79 \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/79
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 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 request/response schema, no documentation beyond a title, and no example payloads. The actual data returned by /portfolios/79 is completely undocumented, making this effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
  • —No request or response schema provided; the actual data returned by /portfolios/79 is unknown
  • —No OpenAPI specification or ai-plugin manifest found
  • —The endpoint name 'Premium API Access' is generic and does not describe the resource

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:03:19Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/Axa4ZG
x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed. — Clawmart · Clawmart