x402 Directory

AI & inference

Paid ai & inference APIs an AI agent can call with x402.

360 endpoints

One-Response Thanks

by @ax3lflores · on AMNT

A single-response agent that returns a fixed, exact thank-you sentence and nothing else; it never initiates payments or implies verification.

$15000.00 Base Creator keeps 100%

Prompt Foundry

by @ax3lflores · on AMNT

Design, test, compare, and export professional prompts for OpenAI, Anthropic Claude, and Google Gemini, with no API keys required for local testing.

$0.10 Base Creator keeps 100%

Invoice Auditor

by @dedge890 · on AMNT

Check invoices, estimates and contractor quotes for arithmetic errors, inconsistent line items, missing details, and unclear payment terms in a structured audit.

$0.01 Base Creator keeps 100%

Product Listing Cleaner

by @dedge890 · on AMNT

Convert messy product names and rough notes into a corrected title, concise description, bullet features, and an organized specifications object for marketplace listings.

$0.01 Base Creator keeps 100%

Discord Server Architect

by @rebelsduck · on AMNT

Design and auto-build a perfect Discord server layout. Tell it your community focus and target audience, and it generates a complete category and channel structure, role plan, and permission scheme you can apply in minutes.

$1.00 Base Creator keeps 100%

Delx Abs N · ABS N

Delx Abs N · api.delx.ai

Absolute value of a number. Call when you need magnitude from signed deltas or balances. Returns absolute numeric value for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

$0.001 Base 100% up 122 paid calls

Loyalspark · X402 Gateway Rewards

Loyalspark · api.loyalspark.online

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens per month; every call is scoped by row-level security to the wallet behind the API key. 16 skill guides at loyalspark.online/.well-known/skills/index.md.

$0.001 Base 100% up 111 paid calls

SatsSignal Demand Radar · Demand Snapshot

SatsSignal Demand Radar · srv1334799.hstgr.cloud

Cheapest agent-ready x402 demand read: what changed, why it matters, recommended action, confidence, evidence, coverage, and freshness.

$0.01 Base 109 paid calls

2s · Search AI

2s · 2s.io

AI web search optimized for agents. Returns ranked results with the relevant extracted content of each page (not just a link + blurb), plus a relevance score. topic=news for recent reporting. Distinct from search.web (raw SERP) — this returns clean, LLM-ready page content per result.

$0.04 Base 100% up 105 paid calls

x402-tokens · Chat Completions

x402-tokens · x402-tokens.fly.dev

gemini-2.5-flash — ceiling; reconciled to actual cost after the call, at 2026-09-03T20:18:51.521Z

$0.0078 Base 104 paid calls

Chat completions · Chat Completions

Chat completions · agent402.tools

OpenAI-compatible chat completions over x402 - point any OpenAI SDK at base_url https://agent402.tools/v1 and pay per call in USDC (Base, Solana, Polygon, Arbitrum, Stellar), no API key, no signup. Budget/mid models: gpt-4o-mini, claude haiku, gemini flash, deepseek, llama, mistral, qwen. Full wire compatibility incl. tools/function-calling and response_format. GET /v1/models lists every model. Streaming supported (stream: true).

$0.02 Base 100% up 103 paid calls

Loyalspark · X402 Gateway Offers

Loyalspark · api.loyalspark.online

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens per month; every call is scoped by row-level security to the wallet behind the API key. 16 skill guides at loyalspark.online/.well-known/skills/index.md.

$0.001 Base 100% up 90 paid calls

Loyalspark · X402 Gateway Programs

Loyalspark · api.loyalspark.online

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens per month; every call is scoped by row-level security to the wallet behind the API key. 16 skill guides at loyalspark.online/.well-known/skills/index.md.

$0.001 Base 100% up 89 paid calls

Kronos Crypto Data & Forecasts · Digest BTC

Kronos Crypto Data & Forecasts · kronossignals.com

Structured market digest for any of the 16 supported crypto assets. Deterministic composite from live signals: derivatives (funding, basis, OI), market regime, 30d realized volatility, fear-greed index, and ML forecast probability (BTC/ETH/SOL only). Single-call 'start here' bundle for autonomous agents. $0.02 USDC via x402. Live track record at /api/stats: ~54% directional hit, ~70% in-range over 15k+ scored forecasts — measured on served predictions, not a backtest.

$0.02 Base 100% up 89 paid calls

NetIntel · Openai GPT 4O

NetIntel · netintel.dev

Call OpenAI's gpt-4o via a single pay-per-call x402 endpoint — no OpenAI account or API key needed, pay $0.10 per request in USDC. Standard OpenAI chat.completions request/response shape, capped input and output. Search terms: OpenAI, gpt-4o, chat completion, LLM, no API key.

$0.10 Base 100% up 88 paid calls

Chat completions - auto tier · Chat Completions

Chat completions - auto tier · agent402.tools

OpenAI-compatible chat completions with the model chosen server-side: omit model and the gateway routes the prompt to the top-ranked model for its task (code, reasoning, long-context, general) from a fixed eval-derived ranking, failing over automatically on provider errors. Flat price per call, 16k chars in, 1024 tokens out, streaming supported. Use it as a drop-in OpenAI base_url when you want good answers without picking a model.

$0.01 Base 100% up 78 paid calls

Chit402 · Chat Completions

Chit402 · api.xfuel.app

Paid inference via x402 USDC on Base and Solana. Cost-plus, quoted, receipted. POST /v1/chat/completions is the recommended surface. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.

$0.002 Base 100% up 67 paid calls

Loyalspark · X402 Gateway Analytics

Loyalspark · api.loyalspark.online

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens per month; every call is scoped by row-level security to the wallet behind the API key. 16 skill guides at loyalspark.online/.well-known/skills/index.md.

$0.005 Base 100% up 66 paid calls

Embeddings (OpenAI-compatible) · Embeddings

Embeddings (OpenAI-compatible) · agent402.tools

OpenAI-compatible text embeddings (text-embedding-3-small by default; 3-large and ada-002 supported), up to 64 inputs or 16k chars per call, returned in the standard OpenAI shape. Identical inputs repeated within 10 minutes are served free from cache. Use it for semantic search, clustering and retrieval from any OpenAI SDK by changing base_url.

$0.002 Base 100% up 66 paid calls