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/171

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/inbox/171` 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 for this specific endpoint confirms it is live and accepts payment via the "exact" scheme on Base, with a max amount of 20,000 base units of USDC (0x8335…2913), which equals $0.02. Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json responses.

Note that while the platform lists many endpoints across different categories, the specific functionality behind `/api/v1/inbox/171` is labeled only as "Premium API Access" with no further documentation on what input it expects or what data it returns. The /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no additional documentation. Without OpenAPI specs, request/response examples, or detailed docs, the actual behavior of this endpoint remains unclear.

Capabilities

x402-paymentusdc-basepay-per-requesthttp-postjson-response

Use cases

  • —Programmatic access to premium API services with per-call USDC micropayments
  • —Agent-driven workflows that need on-demand API calls without API key provisioning
  • —Accessing data, AI, finance, or utility endpoints with no subscription commitment

Fit

Best for

  • —Developers wanting zero-commitment pay-per-use API access
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer crypto micropayments over traditional API subscriptions

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where per-call pricing may be less economical than bulk plans
  • —Users who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/171 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/171
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 there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/inbox/171 is entirely opaque. The platform's docs pages return only 'Connect wallet' with no useful content.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The specific functionality of /api/v1/inbox/171 is undocumented — 'Premium API Access' is the only description
  • —All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content
  • —Request body format and response structure are unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:18:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/2AdqpN
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart