x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/73

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/inbox/73` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning (sentiment analysis, 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, payable in USDC on the Base network with no API keys, rate limits, or commitments required.

The x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units equals $0.02 (USDC uses 6 decimals). The timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific inbox endpoint, so its exact functionality beyond the generic "Premium API Access" label is unclear. The provider's landing page lists the broader API catalog but does not document request or response formats for any endpoint.

Capabilities

x402-paymentpay-per-requestusdc-baseno-api-keypost-endpointpremium-api

Use cases

  • —Agents needing on-demand API access without pre-registration or API keys
  • —Micropayment-gated access to premium data or services
  • —Programmatic pay-per-use API consumption settled in USDC on Base

Fit

Best for

  • —AI agents that can settle x402 payments in USDC on Base
  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —Use cases requiring no rate limits and instant access

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring free or fiat-only payment methods
  • —High-volume batch workloads where per-request pricing may add up

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/73 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/73
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and the specific purpose of /api/v1/inbox/73 is undocumented. The provider's landing page lists many endpoints but provides no technical details for any of them. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint or any endpoint on the provider's site
  • —The exact functionality of /api/v1/inbox/73 ('Premium API Access') is not described anywhere — it could be a generic placeholder
  • —Crawled /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content
  • —No example requests or responses are available to verify what the endpoint actually does

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:47:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/bj3Nau
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart