Observed Signal · May 22, 2026 · Product Launch · Source: DEV Community · Impact: 3/5 · Sentiment: Positive
Pay-per-call Crypto Signal API Built Using x402
A developer published a live pay-per-call crypto signals API called Kiro Crypto Signals that charges $0.01 USDC per full signal call on Base mainnet using x402, Coinbase's pay-per-request protocol. The service exposes free health and preview endpoints, and paywalled endpoints for signals, indicators and a screener; data is pulled live from Binance. The implementation uses Node.js/Express with an x402 payment middleware, Binance WebSocket/REST feeds, ccxt for indicators, and USDC settlement on Base. Discovery is enabled via /.well-known/agent.json, /.well-known/x402 and a Bazaar v2 /discovery/resources listing. The post highlights practical lessons (stable domains over ephemeral tunnels, price anchoring, free previews) and situates the project in a broader trend of hyperscalers adding agent payment infrastructure.
Demonstrates a concrete, low-friction micropayment implementation (x402 + USDC on Base) for API monetization and highlights growing agent-payment infrastructure from major cloud providers—useful proof-of-concept for developer monetization and agent-to-agent commerce.
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Key Takeaways & Evidence Grounding
- Developer launched Kiro Crypto Signals: a live crypto signal API with pay-per-call pricing.
- Full signal endpoint (/signal/:symbol) costs $0.01 USDC; other endpoints include /indicators ($0.005) and /screener ($0.02).
- Payments use x402 (Coinbase's pay-per-request protocol) with USDC settlement on Base mainnet.
- Technical stack: Node.js + Express, x402 express middleware, Binance WebSocket and REST APIs, ccxt for indicators, and a Cloudflare tunnel (temporary).
- Service discovery implemented via /.well-known/agent.json, /.well-known/x402, and a Bazaar v2 /discovery/resources manifest.
Connected Companies & Entities
5 Entities mappedOntology Mapping & Concepts
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AgentScrape Launches x402 Pay-Per-Call Scraping
AgentScrape v0.6.0 launched a pay-per-call web scraping API designed for AI agents that uses the x402 HTTP payment protocol. Each call is priced at $0.001 USDC on Base mainnet with no signup or API keys; payments are authorized off-chain via EIP-3009 and settled through a facilitator service. The service runs on Cloudflare Workers and exposes six paid tools (scrape_webpage, extract_structured_data, screenshot_webpage, extract_metadata, create_browser_session, run_workflow). Coinbase operates the production x402 facilitator endpoint (api.cdp.coinbase.com/platform/v2/x402) and sponsors gas costs on Base mainnet. The first 10 calls per wallet are free for evaluation.
AI agents autonomously buy data via x402 prepaid
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x402: HTTP-Native Payments Let AI Agents Pay APIs
The x402 protocol is an open, HTTP-native payment standard (built on HTTP 402 Payment Required) that enables software — including autonomous AI agents — to pay for APIs and digital resources directly at the HTTP request/response layer. Created by Coinbase and governed by the x402 Foundation, x402 typically uses stablecoins such as USDC for on-chain settlement and relies on a three-party flow involving a client, a resource server, and a facilitator that verifies payment proofs. The protocol supports multiple chains (Base, Ethereum, Polygon, Arbitrum, Solana) and aims to replace account- and API-key-based billing with per-request, wallet-backed payments. The article discusses implementation trade-offs, security risks (wallet custody, replay protection, metadata exposure), compliance questions (KYC/AML, accountability), and implications for API monetization and machine-to-machine commerce.
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