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/18

What it does

This endpoint at `/api/v1/portfolios/18` 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/18` 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. There are no API keys, no rate limits, and no subscription commitments — callers simply attach a valid x402 payment header to each POST request.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no explanation of what the `/portfolios/18` resource actually returns. The platform appears to be a demonstration or early-stage deployment of x402-gated microservices. Without knowing the response schema or the nature of the "portfolio" data, agents should treat this as an exploratory integration.

Capabilities

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

Use cases

  • —Fetching portfolio data on-demand with per-request USDC micropayments
  • —Integrating x402-gated endpoints into autonomous agent workflows
  • —Testing x402 protocol payment flows on Base network

Fit

Best for

  • —Developers experimenting with x402 pay-per-request protocols
  • —Agents that need keyless, permissionless API access settled in USDC
  • —Low-volume or sporadic data consumers who prefer pay-as-you-go

Not for

  • —Production workloads requiring well-documented request/response schemas
  • —High-volume consumers who need bulk pricing or subscription discounts
  • —Users without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/18 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/18
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the /portfolios/18 resource returns, no OpenAPI spec, no request body schema, and no example responses. Docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.

Warnings

  • —No documentation available — all doc/API/pricing/README pages return only 'Connect wallet' with no content.
  • —No OpenAPI or request/response schema provided; the actual data returned by /portfolios/18 is unknown.
  • —Platform appears to be early-stage or a demo; reliability and data quality are unverified.
  • —The specific meaning of 'portfolios/18' is undocumented — it could be placeholder or test data.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:19:33Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

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