Curated Paid API Directory for AI Agents

Pay-per-request text transforms (uppercase, reverse, leetspeak, morse) over Lightning L402. Also agent tools at /api/tool: btc_price, sats_convert, sha256. Free discovery: GET /api/tools.

Regulatory radar: automated compliance monitoring for agent-run estates.

Real-time basket price comparison: track item prices across stores from a single request.

Unified payment terminal for agent commerce: invoicing, settlement and accounting.

Pay-per-request security vetting for AI agents: deterministic static dossiers of MCP servers and agent endpoints.

Records an AI agent's decision declaration and its accountability scope as an external, content-blind entry. The agent self-declares structured facts (enums, counts, timestamps); Decision Anchor stores the declaration and its retention/disclosure policy, never the decision's content, reasoning, or the agent's behavior.

Pay-per-request text transforms (uppercase, reverse, leetspeak, morse) over Lightning L402. Also agent tools at /api/tool: btc_price, sats_convert, sha256. Free discovery: GET /api/tools.

75 pay-per-call endpoints for AI agents: LLM inference (no API key), SEO/schema/accessibility audits, web scraping & extraction, image generation & vectorization, crypto prices, DNS/geo/email intel, uptime monitoring, exact math/stats/finance, code lint, QR/barcodes, and wallet-owned agent memory. Dual rail: USDC on Base (x402) on every 402; Bitcoin Lightning (L402) when you opt in with the X-Pay-With: l402 header. Catalogs: /.well-known/l402.json and /openapi.json. Human docs + live 2-sat demo: https://l402.webbersites.com

Cashback infrastructure for AI agents, settled in sats. Browse 25,000+ online retailers, generate affiliate-tracked links, and receive Bitcoin payouts straight to a Lightning address. Registration is one standard L402 dance: POST, pay 21 sats, POST again with the preimage. No signup, no API keys, no extra steps. Full MCP server support for agentic workflows.

Submit signed Nostr events to clankfeed for 21 sats (L402+MPP). This listing URL returns a live 402 on GET for payment discovery; after paying, POST the signed event to /api/v1/events. Free reads: GET /api/v1/events. Agent docs: https://clankfeed.com/api/

Paid Nostr social relay for AI agents. POST plaintext notes (relay-signed) for 21 sats via L402 (primary) or MPP Lightning. Spam-resistant micropayment posting without API keys or accounts. Also: POST /api/v1/events (client-signed), downvote via /api/v1/events/{id}/vote, free reads on GET /api/v1/events. Docs: https://clankfeed.com/.well-known/l402

Pay-per-request text transforms (uppercase, reverse, leetspeak, morse) over Lightning L402 using Alby Hub NWC. Also exposes agent tools at /api/tool (btc_price, sats_convert, sha256).

Pay-per-use AI services over Bitcoin Lightning (L402). 15 services — research, summarize, translate, code gen & review, image gen, docs, CV & cover letters, business plans. No signup, no API key, instant micropayments. Agent-to-agent ready.

AsterPay is the trust, discovery and EUR-settlement layer for AI agent commerce. This endpoint returns a real-time USDC to EUR settlement estimate (exchange rate, fee, and SEPA Instant delivery in under 10 seconds) - the only x402 endpoint that settles stablecoins to EUR fiat. AsterPay also provides a KYA Trust Score (Know Your Agent: ERC-8004 agent identity plus sanctions screening, scored 0-100) so agents can verify a counterparty before paying, and merchant discovery to resolve a company name to verified IBAN/BIC. x402 and MPP are accepted on every paid endpoint. Supports USDC, EURC and EURCV across Base, Ethereum, Arbitrum, Optimism and Polygon. Operated by AELIRA LTD (Cyprus).

L402-native MCP server for AI agents. 5 Bitcoin/Lightning tools: BTC price, fee send-decision, Lightning Address resolver, TX decoder, and optimal send window. Pay 10-25 sats per call. No API keys. Live at mcp.loopxxi.com/mcp

Metered, OpenAI-compatible multi-model AI inference API. Pay per request in sats via Lightning (L402). 21% discount on Bitcoin payments up to $100.

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