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.

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.

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.

Jittator has been discontinued and accepts no payments.

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.

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.

Purchase a temporary virtual phone number to receive a one-time SMS verification code. Pay-per-use via Lightning. Price varies by country/service.

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

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

Authoritative DNS hosting for domains you already own (DNSSEC-signed, JSON record API, 60 s minimum TTL), secondary DNS for zones on your own primary, and dynamic-DNS hostnames under dynkite.com. Paid per order in sats, no account or API key: an unpaid POST gets HTTP 402 with an L402 challenge (WWW-Authenticate) and a Cashu NUT-24 payment request (X-Cashu); pay either and repeat the request. Every request is checked for free first, so a request that would fail gets a 4xx and no invoice. A free Nostr account (NIP-98) can also order with a Lightning invoice or a bitcoin address, and register .com/.net/.org domains. Routes (POST JSON on https://api.satsdns.com): - /v1/ddns/create/30d: dynamic-DNS hostname, 200 sats (1 year 2,000) - /v1/zones/create/30d: hosted DNS zone, 500 sats (1 year 5,000) - /v1/secondary/create/30d: secondary DNS zone, 500 sats (1 year 5,000) - /v1/zones/renew/30d, /v1/ddns/renew/30d: renewals; /v1/zones/queries/1m: 1,000,000 more queries, 200 sats - Management routes, /v1/info and /healthz: free The listed URL answers GET with the 402 price only; the real call is a POST with a JSON body such as {"hostname": "myhost"}. Nameservers ns1.satsdns.com and ns2.satsdns.com. No email or KYC for DNS hosting, no stored balance, nothing renews automatically. Docs: https://satsdns.com/docs OpenAPI: https://satsdns.com/openapi.yaml Agent skill: https://satsdns.com/skill.md

Export the full service directory as JSON in a single request. Paywalled (5000 sats / $2.50 USDC). Supports L402 and x402.

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/

Live Polygon (eip155:137) network health for AI agents: latest block number, gas price (gwei), chain status and liveness. A cheap pay-per-call primitive for gas-aware transaction routing and 'is Polygon healthy?' preflight checks. x402 / USDC, no signup, no API key.

Live Base (eip155:8453) network health for AI agents: latest block number, base fee and priority gas price (gwei), chain status and liveness. A cheap pay-per-call primitive for gas-aware transaction routing and 'is Base healthy?' preflight checks. x402 / USDC on Base, no signup, no API key.

Live Solana network health for AI agents: current slot, epoch, TPS, block height, validator count and SOL price. A cheap pay-per-call primitive for liveness checks and congestion-aware routing. x402 / USDC, no signup, no API key.