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/178

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/inbox/178` 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, settled in USDC on the Base network.

The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme to a specified wallet address, with a max amount of 20,000 base units of USDC (0.02 USD given 6 decimals). There are no API keys required, no rate limits advertised, and access is described as instant once payment is included in the request header. The platform emphasizes a simple pay-per-use model with no minimums or commitments.

However, the specific functionality behind `/api/v1/inbox/178` is not documented — the listing title is simply "Premium API Access" with no further detail on what this particular inbox endpoint returns. The crawled site lists many other endpoints but does not mention an "inbox" route. Without an OpenAPI schema, request/response examples, or dedicated documentation for this path, the actual behavior of this endpoint remains unclear.

Capabilities

x402-paymentusdc-basepay-per-requestpost-endpointno-api-key

Use cases

  • —Accessing premium API services without API key management
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven workflows that need instant, keyless API access

Fit

Best for

  • —Developers who want pay-per-use API access without subscriptions
  • —AI agents that can settle x402 payments autonomously
  • —Users already holding USDC on the Base network

Not for

  • —Users who need detailed documentation or guaranteed SLAs before calling
  • —Anyone without USDC on the Base network
  • —Use cases requiring high-volume batch processing at discounted rates

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/178 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/178
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/inbox/178 has no documentation, no schema, no request/response examples, and its purpose ('inbox') is not mentioned anywhere on the site. Effectively a stub listing.

Warnings

  • —The specific endpoint /api/v1/inbox/178 is not documented on the provider's site — its actual functionality is unknown.
  • —No OpenAPI schema, request format, or response format is available.
  • —The 'inbox' path does not appear in the provider's listed API catalog, raising questions about what this endpoint does.
  • —No dedicated docs, pricing, or README pages rendered meaningful content (all showed only 'Connect wallet').

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:38:19Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/X5mDDj
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart