x402basequality 0.25

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/67/transactions

What it does

This endpoint at lowpaymentfee.com exposes a POST-based transactions API for portfolio #67 via the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 challenges settled in USDC on the Base network.

The specific endpoint `/api/v1/portfolios/67/transactions` accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, consistent with the platform's uniform $0.02/request pricing. Payment is made via the x402 exact scheme to the specified payTo address, using the canonical Base USDC contract (0x8335…2913). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.

Documentation on the site is extremely thin — the docs, pricing, API, 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 transactions endpoint actually returns or what POST body it expects. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality the transactions resource provides. The platform appears to be a demonstration or early-stage x402 API marketplace.

Capabilities

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

Use cases

  • —Submitting or retrieving portfolio transaction records via a pay-per-call model
  • —Integrating x402-compatible agents with financial transaction endpoints
  • —Testing x402 payment flows against a live endpoint on Base

Fit

Best for

  • —Developers experimenting with x402 payment protocol integration
  • —Agents that need pay-per-call access without API key management
  • —Low-volume, on-demand portfolio transaction queries

Not for

  • —Production use cases requiring documented request/response schemas
  • —High-volume batch transaction processing (no documented rate limits but no guarantees either)
  • —Users who need non-crypto payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/67/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/67/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on request format, response schema, or what the transactions resource actually does. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or request/response schema provided; request body and response format are unknown
  • —The purpose of the /portfolios/67/transactions endpoint is undocumented — it is unclear what data it returns or accepts
  • —Platform may be a demo or early-stage project; reliability and longevity are uncertain

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:50:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/rdWrs9
x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart