x402basequality 0.30

x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/89

What it does

This endpoint at lowpaymentfee.com provides access to a specific portfolio resource (ID 89) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.

The specific endpoint `/api/v1/portfolios/89` is listed under "Premium API Access" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 given USDC's 6 decimal places. There are no API keys required, no rate limits advertised, and access is instant once payment is included in the X-PAYMENT header. The x402 challenge (version 1, scheme "exact") was confirmed live during probing.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio resource actually contains or what fields the POST body expects. The endpoint is confirmed live and correctly returning a 402 challenge, but without documentation it is unclear what data is returned or what input is required beyond the payment header.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestportfolio-datapost-endpoint

Use cases

  • —Retrieving portfolio data for a specific portfolio ID via paid API call
  • —Integrating pay-per-request portfolio lookups into automated trading or analytics pipelines
  • —Agent-driven data retrieval where no API key provisioning is desired

Fit

Best for

  • —Developers wanting keyless, pay-per-call access to portfolio data
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer on-chain micropayments over subscription billing

Not for

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

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/89 \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/89
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the portfolio resource contains or what POST body is expected. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
  • —No OpenAPI or schema describing request body or response format for this endpoint.
  • —The nature of the 'portfolio' data returned is completely undocumented.
  • —No request or response examples are available from any source.

Citations

Provenance

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

Agent access

JSONhttps://clawmart.sh/api/listings/6SGnVY
x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart