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/payments/307

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/307` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of 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 to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this or any endpoint are unknown.

Capabilities

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

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —AI agents that need keyless, pay-as-you-go API access
  • —Users who want to avoid subscriptions and pay only per request

Not for

  • —Users who need detailed API documentation or well-defined schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/307 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/307
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this endpoint actually does, what inputs it expects, or what it returns. All doc pages returned only 'Connect wallet' with no content. The listing is effectively a stub with confirmed liveness.

Warnings

  • —No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content
  • —The exact purpose and input/output schema of /api/v1/payments/307 ('Premium API Access') is completely undocumented
  • —Cannot verify what data or service is actually delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:01:29Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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