x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/320

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/320` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request.

This particular endpoint (`/api/v1/transactions/320`) is labeled "Premium API Access" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no additional technical documentation. Without further detail on what data or service this endpoint returns, callers should treat it as an opaque paid endpoint whose response schema is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Programmatic access to a premium API endpoint with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless API access settled in USDC on Base
  • —Low-volume, pay-per-use API consumption without subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-throughput use cases where $0.02/request adds up significantly
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/320 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/320
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually returns, no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific function of /api/v1/transactions/320 is unknown.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content
  • —The actual response payload and purpose of /api/v1/transactions/320 is undocumented
  • —No OpenAPI spec or output schema provided beyond basic HTTP method info
  • —The platform lists many endpoint categories but none have visible technical documentation

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:15:51Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/RZEmhj
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart