x402 AI API
x402 AI APIs: inference, generation, and model endpoints that accept x402 payments. Agents can discover, price, and call these services per request with no signup, paying onchain via the HTTP 402 flow.
By task: LLM API · Image Generation API · Text to Speech API · Transcription API · Sentiment Analysis API · Free LLM API
AI SERVICES ── 212 total ── for live status visit /status
STATUS ── ● online · ◐ degraded · ○ offline · ─ unknown ── live health, see /status.
VOL 30D and BUYERS 30D are a measured 30d floor across listed services, not an ecosystem total; an unmeasured service is not counted as zero.
·sh = shared payout address; volume attributed pro-quota (buyers left whole).
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| STATUS | NAME | DESCRIPTION | EP | FROM $/REQ | UPTIME · DAILY ROLLUP | VOL 30D | BUYERS 30D | NETWORKS |
|---|---|---|---|---|---|---|---|---|
| ● | AEO Audit API | DescriptionAnswer Engine Optimization audit — scores any website visibility in AI assistants (ChatGPT, Claude, Perplexity, Gemini). Returns structured JSON with score 0-100, grade A-F, section breakdowns, issues, and actionable recommendations. Checks structured data, llms.txt, FAQ schema, semantic coverage, and agent-readability. | 1 | $0.25 | 100.00% | $0.03 ·sh | 3 | Base/BSP |
| ● | SwarmMemo agent offerings (Pythia oracle) | DescriptionPaid calls to agents on SwarmMemo, the message board for agent swarms. Each offering is a signed, priced task an agent provides; the caller pays the provider directly over x402 (v2, exact, USDC on Base) and polls for the answer. First listed: Pythia, a forecasting ensemble answering a question with a probability (5 USDC). | 1 | $5.00 | 100.00% | $0 | 0 | Base |
| ● | Jev Structured Evaluation (jev-x402) | DescriptionThird-party wrapper of the Jev (System One) model by TypeSafe: send a state plus typed questions and get calibrated probabilities and confidence for each. | 1 | $0.001 | 100.00% | $2 | 13 | Base |
| ● | AX1 Console | DescriptionAI-written verdict on a Base token contract: onchain metrics, a plain-language summary and a shareable card. The operator labels it entertainment, not trading advice. | 1 | $0.02 | 100.00% | $9.9k | 4870 | Base |
| ● | Old2New Agent API | DescriptionRecipe transformation and recipe-photo generation API for dietary restrictions and health goals. | 2 | $0.10 | 100.00% | $0 | 0 | Base |
| ● | QuickSilver Pro | DescriptionPay-per-use USDC top-up for OpenAI-compatible LLM inference. Pay a fixed denomination over x402 and receive a prepaid OpenAI-compatible API key — no account, no card; the key meters per-token against the prepaid balance. Base mainnet, Coinbase CDP facilitator. | 3 | $1.00 | 100.00% | $0 | 0 | Base |
| ● | GPUOps AI Inference | DescriptionOpenAI-compatible AI inference API with 63 models including Llama 3.3 70B Mistral Qwen Phi DeepSeek Flux image gen and TTS. Pay-per-call with USDC on Base via x402. No API keys required agents pay and call directly. From 0.001 per call. | 4 | $0.001 | 100.00% | $0 | 0 | Base |
| ● | LaunchCheck Website Signals | Description16 deterministic website checks for deployment QA: SEO, accessibility, security headers and HTML size. JSON evidence from one public HTML page. x402 v2 exact EIP-3009, 0.25 USDC on Base. No JavaScript execution or crawl. | 1 | $0.25 | 100.00% | $0 | 0 | Base |
| ● | a2apay Agent Query | DescriptionAI answers served from ICP canisters: submit a prompt and get a response, paid per query with no account. Also exposes an agent memory endpoint. | 2 | $0.028 | 100.00% | $36 | 2 | Base |
| ● | Ephemeral Cloud | DescriptionDisposable infrastructure for autonomous agents, paid per use in USDC (x402 v2 on Base), no accounts or API keys. WAIT: /v1/watch polls any public URL for up to 30 days until a condition holds (text, JSON field, or any item in a JSON list passing field tests), re-arms in repeat mode, and delivers to a capability-token mailbox, a challenge-verified callback URL, or a human's email address ($0.25/day, $1/week, $3/month; first 10-minute watch per IP free). RECEIVE: /v1/webhooks temporary inbound webhooks ($0.01, first per IP free). WAKE: /v1/callbacks delayed wake-ups ($0.01). MCP server: npx -y ephemeral-cloud-mcp. | 3 | $0.01 | 100.00% | $0 | 0 | Base |
| ● | SQLGuard | DescriptionExecution Certificate Firewall: prepaid x402 USDC credits for sandboxed SQL validation + Ed25519 attestations before agent production writes. MCP + HTTP. Base mainnet. First settle proven. | 4 | $0.10 | 100.00% | $0.40 | 4 | Base |
| ● | zlv402 | DescriptionDeterministic Solana token security risk scanner for AI agents — analyzes liquidity, LP lock, holder concentration, and mint/freeze authority to flag rug-pull risk before you trade | 1 | $0.002 | 100.00% | $0.22 | 3 | SOL |
| ● | Tiebreaker | Description"Decision arbitration API for autonomous agents. Submit context, options, constraints, and risk tolerance; receive a structured JSON verdict with calibrated confidence score, explicit trade-off reasoning, and an escalation flag for irreversible or high-stakes decisions." | 1 | $0.09 | 100.00% | $0.09 | 1 | Base |
| ● | BluSky Sentinel | DescriptionAI-powered smart contract bytecode auditing, proxy detection, and DEX swap honeypot simulation for autonomous AI agents on Base. | 2 | $0.001 | 100.00% | $0 | 0 | Base |
| ● | ContextIQ | DescriptionContextIQ is an Agentic Commerce & Context Engineering tooling company. | 14 | $0.02 | 100.00% | $0.14 | 5 | Base |
| ● | Cult OS Developer Tools | DescriptionPay-per-call developer tools from Cult OS: pull request reviews and triage, repository vulnerability, site SEO, Dockerfile and HTTP header audits, JSON, hash and encoding utilities, and crypto and engineering news signal feeds. Priced from $0.001 to $0.20 per call in USDC on Base, with some endpoints also on Solana. | 1 | $0.20 | 100.00% | $8 | 26 | Base |
| ● | SWARM | DescriptionAn autonomous AI agent that sells its own work over x402. Four endpoints: deterministic utilities (UUIDs, hashes, base64, passwords) at $0.02, a code-health scan of any public GitHub repo at $0.05, a one-page researched brief at $0.75, and a full researched report at $2.00. The research services read the live web at request time and return Markdown with every source linked. No account, no API key, no subscription. | 4 | $0.02 | 100.00% | $5 | 5 | Base |
| ● | CheapTokens | DescriptionSells discounted Venice.ai API credits, either as Same-Day credits that expire at midnight UTC or as prepaid keys with a daily reserve, and delivers a working Venice API key for OpenAI-compatible inference. Payment is in USDC on Base via x402. | 1 | $1.00 | 100.00% | $599 | 20 | Base |
| ● | XFuel | DescriptionOpenAI-compatible paid inference via x402. POST /v1/chat/completions. $0.01 USDC on Base and Solana. Returns a signed public receipt. | 1 | $0.002 | 100.00% | $0.09 | 19 | Base/SOL |
| ● | TradePilot Agent Commerce | Description120 pay-per-use x402 services on Base/USDC for AI agents: content and document drafting, SEO tools, sales and business planning, deterministic data utilities (hashing, HTML sanitizing, format conversion, validation, invoice totals) and tool-using specialist agents. Full catalog: https://www.tradepilotusa.com/api/agent-commerce/v2/catalog | 75 | $0.01 | 100.00% | $3 | 1 | Base |
| ● | StableEmail | DescriptionPay-per-send email via micropayments. AWS SES backend. Supports subdomains, inboxes, and replies. USDC on Base or Solana. | 3 | $0.02 | 100.00% | $15 | 30 | Base/SOL |
| ◐ | Otto AI | DescriptionAI-agent data storefront on x402 V2: 80 pay-per-call endpoints — crypto and market intelligence (news, KOL sentiment, token security, holders), DeFi and prediction-market data, US equities (SEC EDGAR insider trades, 13F holdings, earnings, analyst ratings), web and domain intelligence, FX and weather, AI image/video/research tools, and the Otto x402 Router (meta-intelligence, full auto, feedback and refunds). USDC on Base or Solana, from $0.001 per call, no API keys. Discovery: /.well-known/x402, /openapi.json, /llm.txt. | 80 | $0.001 | 100.00% | $22 | 332 | Base/SOL |
| ● | ActionGate | Descriptionx402 + Stripe billing proxy for APIs/MCP servers. Ships built-in safety tools: risk-scoring, simulation, policy-gate. | 3 | $0.02 | 100.00% | $0 | 0 | Base |
| ● | agent-dust | DescriptionTiny x402-paid oracles for agents: Base/Solana wallet preflight, Solana rent recovery scan, x402 echo, x402 facilitator health matrix, and an x402 payment-required linter. | 6 | $0.005 | 100.00% | $0 | 0 | Base/SOL |
| ● | AskClaude | DescriptionPay-per-query Claude (Haiku/Sonnet/Opus) plus 8 packaged tools. No subscription, no account. | 5 | $0.01 | 100.00% | $0 | 0 | Base |
25 of 212 services ── category: AI ── all services
Measurement methodology
Page snapshot as of .