x402basequality 0.30

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/transactions/275

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 pay-per-call at $0.02 per request, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/transactions/275` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page 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 usage examples available from the crawled content. The actual functionality behind this specific `/transactions/275` endpoint is unclear from the available material.

Capabilities

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

Use cases

  • —Accessing pay-per-call API services without API key registration
  • —Making micropayment-gated API calls settled in USDC on Base
  • —Agent-driven API consumption with per-request crypto payments

Fit

Best for

  • —Developers wanting zero-signup API access via crypto micropayments
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer pay-as-you-go pricing with no commitments

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/275 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/275
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no clarity on what the /transactions/275 endpoint actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.

Warnings

  • —No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge
  • —The /docs, /pricing, /api, and /README pages contain no usable content (only 'Connect wallet')
  • —The specific purpose of /api/v1/transactions/275 ('Premium API Access') is not documented anywhere
  • —Cannot verify what data or service is returned after successful payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:53:01Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/e49LqG
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart