x402basequality 0.35

x402-gated premium API access on Base, paid per-request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/stripe/subscriptions/143

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall, settling payments in USDC on the Base network. The specific resource path (`/api/v1/stripe/subscriptions/143`) suggests a subscription-related API, though the x402 challenge indicates it operates on a per-request payment model rather than a traditional subscription. The endpoint accepts POST requests and returns application/json responses.

The broader lowpaymentfee.com platform offers a suite of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most endpoints on the platform are listed at $0.02 per request. However, this particular endpoint has a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the platform's standard pricing.

The platform advertises no API keys, no rate limits, and instant access via the x402 protocol. Payment is made by including an X-PAYMENT header with each request. Documentation pages on the site appear to require a wallet connection and did not yield substantive content during crawling, so the exact request/response schema for this endpoint is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkper-request-billingjson-apipost-methodpremium-access

Use cases

  • —Programmatic access to premium API features with per-request USDC micropayments
  • —Agent-driven workflows that need keyless, instant API access without signup
  • —Integrating pay-as-you-go API calls into Web3 applications on Base

Fit

Best for

  • —Developers who want keyless, pay-per-request API access
  • —AI agents that can settle x402 payments autonomously
  • —Users already holding USDC on the Base network

Not for

  • —Users who need detailed API documentation before integrating (docs are sparse)
  • —Applications requiring free or fiat-only payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/143 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/143
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 schema, no documented request/response format, and the docs/pricing/README pages all returned only a 'Connect wallet' prompt with no usable content. The endpoint path ('stripe/subscriptions/143') is opaque — it's unclear what the endpoint actually does beyond 'Premium API Access'.

Warnings

  • —No OpenAPI or request/response schema available — the exact functionality of this endpoint is unknown.
  • —Documentation pages (docs, pricing, README) returned no substantive content; they appear to require wallet connection.
  • —The endpoint path references 'stripe/subscriptions' which is ambiguous — it may be a subscription management endpoint or simply a naming artifact.
  • —The actual behavior and output of this endpoint cannot be verified without making a paid request.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 10:47:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/dSqMsG
x402-gated premium API access on Base, paid per-request in USDC. — Clawmart · Clawmart