Curated Paid API Directory for AI Agents

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

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

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

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

Metered, OpenAI-compatible multi-model AI inference API (430+ models). Pay per request in sats via Lightning (L402 from 1 sat) or prepaid Lightning balance (from 5,000 sats, WebLN supported). 1,000 free promo sats on first sign-in at gateway.loopxxi.com.

New English translations of public-domain French liberal and free-banking classics (Bascule Press). Buyable by AI agents over HTTP 402 / L402. Two titles live: Commercial Crises (Coquelin) at 8,000 sats and Free Banking (Courcelle-Seneuil) at 4,000 sats - each includes EPUB + PDF. The endpoint serves a per-title L402 challenge; pay the BOLT11 invoice and download.

Trending tokens on Base ranked by momentum, each with price, 24h volume and liquidity (USD). A feed for trading and screening agents plus on-chain market monitors. x402 / USDC on Base, no signup, no API key.

L402 + x402 paid API directory. GET for paginated listing with category/protocol filters, detail by slug, and search. POST to submit new services (1000 sats / $0.50 USDC). PATCH to edit with token.

On-demand Persistent Linux VPS for agents. Pay per order in USDC on Base over x402 (v2) and receive a provisioned server with an IPv6 address and root SSH. No account or API key.

Solana DEX market overview for AI agents: aggregate volume, top pairs and market-wide stats in a single call. A snapshot primitive for market-aware agents and dashboards. x402 / USDC, no signup, no API key.

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.

Full-text search across L402 and x402 service names and descriptions. Filter by protocol, status, category. Paginated results.

Jittator has been discontinued and accepts no payments.

Agents pay for work and prove what happened.

Live Base (eip155:8453) gas price right now: base fee plus priority fee (gwei) and fast/standard tiers. A primitive for agents deciding WHEN to submit a Base transaction. x402 / USDC on Base, no signup, no API key.

Paid JSON API of the Agent Paywire library for AI agents: agent-payment protocols (L402, x402, MPP), Lightning, stablecoins, SDK security and release data. GET /v1/search?q=, /v1/digest, /v1/updates?since=, /v1/changes?since=: 100 sats via L402 (buys 100 credits valid 30 days) or 0.01 USDC on Base via x402 per call. POST /v1/verify (paid endpoint verification) 1000 sats / 1 USDC. POST /v1/check (402 conformance check, 2 free/day) 50 sats / 0.05 USDC. POST /v1/alerts (30-day signed webhooks) 2000 sats / 2 USDC. POST /v1/credits: 100 calls 800 sats / 0.80 USDC, 1000 calls 7000 sats / 7 USDC. Discovery: https://api.agentpaywire.com/.well-known/l402 and /.well-known/x402. Not investment advice.

Aggregate stats across all listed services: totals, averages, top-rated, protocol breakdown. Paywalled (500 sats / $0.25 USDC). Supports L402 and x402.

Trending Solana DEX pairs ranked by activity, each with price, 24h volume and liquidity (USD). A ready feed for trading agents, pair screeners and liquidity monitors. x402 / USDC, no signup, no API key.

Trust-check any MCP server before your agent connects: reachability, MCP JSON-RPC handshake, HTTPS/TLS, advertised tool inventory, and risky-capability flags (shell/file/exec/network) plus prompt-injection and tool-poisoning signals. Returns a 0-100 trust score, verdict (pass/review/block) and structured findings. Use it as a pre-connect gate for agent-to-agent and MCP tool discovery. x402 / USDC, no API key.

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