x402basequality 0.25

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/charges/225

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. 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 commitments required.

The specific endpoint at `/api/v1/charges/225` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual functionality behind this specific `/charges/225` endpoint and the other listed endpoints cannot be verified from the crawled material.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Programmatic access to utility APIs without needing API key registration
  • —Agent-driven workflows that pay per call using USDC on Base
  • —Exploring x402 payment protocol integration patterns

Fit

Best for

  • —Developers experimenting with x402 pay-per-call protocols
  • —Agents that need keyless, on-demand API access settled in USDC
  • —Low-volume or sporadic API usage where subscriptions are overkill

Not for

  • —Production workloads requiring documented request/response schemas
  • —Use cases needing guaranteed SLAs or support contracts
  • —Users without Base network USDC wallets

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/225 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/225
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what outputs it returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. No OpenAPI spec or examples exist. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • —No OpenAPI or schema describing request/response formats for this endpoint
  • —The purpose of '/api/v1/charges/225' ('Premium API Access') is completely undocumented — unclear what it actually returns
  • —Cannot verify that any of the advertised endpoints (AI, finance, analytics, etc.) are functional

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:30:13Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/8QqCxP
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart