x402basequality 0.35

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/139

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/inbox/139` is one of many endpoints offered by the platform, which advertises 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, no rate limits, and no minimum commitments.

The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain via the "exact" scheme to a specified wallet address, with a maximum amount of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The timeout for payment settlement is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response payloads were found beyond the landing page catalog listing.

Note that while the platform lists many endpoint categories, the specific functionality behind `/api/v1/inbox/139` is not documented beyond the generic label "Premium API Access." Without further documentation or example payloads, it is unclear what data or service this particular inbox endpoint returns. Prospective callers should test with a small payment to discover the response format.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Programmatic access to premium API services without subscription or API key management
  • —Agent-driven workflows that need on-demand, pay-as-you-go API calls settled in USDC
  • —Exploring a multi-category API catalog (data, AI, finance, utilities) with uniform micro-pricing

Fit

Best for

  • —Developers or agents wanting frictionless, keyless API access at $0.02/call
  • —x402-compatible agents that can settle USDC payments on Base
  • —Use cases requiring low-commitment, no-minimum API consumption

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before calling
  • —High-volume consumers who would benefit from bulk pricing or subscription plans
  • —Anyone unable to transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/139 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/139
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation for the specific /inbox/139 endpoint, no example request or response payloads, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The actual functionality of this endpoint is unknown.

Warnings

  • —No documentation exists for the specific /api/v1/inbox/139 endpoint — its purpose and expected input/output are unknown.
  • —No OpenAPI or schema definition was found for any endpoint on the platform.
  • —The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').
  • —The broad catalog claims (AI, finance, data, etc.) could not be independently verified.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:37:57Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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