# SingIt

> Your agent spends. Your wallet keeps the money: set a daily and a per-purchase limit once, and your AI agent buys gift cards, eSIMs, top-ups and live answers inside those limits.

## What it is

SingIt lets you connect the wallet you already use, set a daily and a per-purchase limit, and approve once. Your AI agent then buys gift cards, eSIMs, mobile top-ups and live model answers inside those limits, on Base or Solana. One signature takes the allowance back.

## Products

- Web app at https://app.singitai.app/app/ — connect a wallet, set limits, let an agent spend inside them.
- SingIt Ask, an x402 API at https://ask.singitai.app — language-model chat completions, Anthropic's Messages and OpenAI's Responses formats, images, speech and web search, each paid per call in USDC on Base or Solana, no account or API key. Its own llms.txt: https://ask.singitai.app/llms.txt
- A remote MCP server at https://app.singitai.app/mcp (free tools without a key; a SingIt API key for paid tools).

## Start here: free, then a key, then MCP

1. Free: POST https://ask.singitai.app/v1/chat/completions with model "free/deepseek-v4.1-flash". 20 short answers a day per network, no wallet, no key; resets at midnight UTC.
2. API key: in the SingIt app (https://app.singitai.app/app/), Settings → API keys. The wallet signs the key's limits (per day, per request, how many days); top up $1 to $50 at a time in USDC. With a key, OpenAI SDK, Anthropic SDK and Claude Code work at https://app.singitai.app/v1 (cost + 30%, no per-call fee).
3. MCP: https://app.singitai.app/mcp (Streamable HTTP), official MCP Registry name app.singitai/singit.
   - Free, no key: get_price, list_price_symbols, list_models.
   - Free with a key (read-only): get_balance, get_limits, get_receipts.
   - Paid per call from the key's limits (USDC on Base or Solana): web_search, read_page.
   - Paid, Base accounts for now: get_x_profile, get_crypto_news, get_hyperliquid_market, get_funding_rates, resolve_ens, get_token_price; demo calls get_weather, get_singit_risk_check.
   - Claude Code: claude mcp add --transport http singit https://app.singitai.app/mcp --header "Authorization: Bearer sk_singit_..."
   - Install guide: https://github.com/bubon-ik/SingItAI/blob/main/llms-install.md

Agents with their own wallet can skip the key: pay per answer over x402 at https://ask.singitai.app (USDC on Base or Solana).

## First paid x402 call

1. POST https://ask.singitai.app/v1/chat/completions with no payment, e.g. {"model":"deepseek-v4.1-flash","max_tokens":200,"messages":[{"role":"user","content":"Hello"}]}. The answer is HTTP 402 with a PAYMENT-REQUIRED header: base64 JSON, x402Version 2.
2. Its accepts list `upto` first (Base, then Solana): you sign a ceiling and pay the answer's actual cost + 30% + a 0.001 USDC fee on Base (0.002 on Solana). `exact` follows on both networks: a flat price for a typical-length answer (about 30% of max_tokens), for wallets that sign only exact. For Claude Opus, sign `upto`: its `exact` price carries room for thinking tokens and is usually dearer than the answer used (recommendedScheme in https://ask.singitai.app/pricing.json). USDC on Base needs no ETH (gas is sponsored).
3. Sign one offer and retry the same request with the PAYMENT-SIGNATURE header. HTTP 200: choices[0].message.content, billing.totalAtomic (what was settled, in USDC micro-units) and a PAYMENT-RESPONSE header.
- Walkthrough with code (x402 fetch, Coinbase Bazaar MCP, Coinbase agentic wallet): https://github.com/bubon-ik/SingItAI/blob/main/docs/first-paid-call.md

## For developers

- Health and status: https://ask.singitai.app/health (JSON: model and payment-rail status), https://singitai.app/status/ (page), https://ask.singitai.app/numbers.json (measured numbers)
- Docs: https://singitai.app/developers/
- SingIt Ask OpenAPI: https://ask.singitai.app/openapi.json
- SingIt Ask x402 discovery: https://ask.singitai.app/.well-known/x402
- Source: https://github.com/bubon-ik/SingItAI

## Links

- Home: https://singitai.app/
- Developers: https://singitai.app/developers/
- Models: https://singitai.app/models/
- App: https://app.singitai.app/app/
<!-- generated:model-pages:start -->
## Model pages and spending limits

- [All model pages](https://singitai.app/models/all/)
- [Agent spending limits for USDC on Base](https://singitai.app/agent-spending-limits/)
- [How to limit what an AI agent can spend](https://singitai.app/limit-ai-agent-spending/)
- [x402 payments with a budget for AI agents](https://singitai.app/x402-budget-for-agents/)
- [Aion 3.0](https://singitai.app/models/aion-labs-aion-3-0/)
- [Aion 3.0 Mini](https://singitai.app/models/aion-labs-aion-3-0-mini/)
- [Aion 2.0](https://singitai.app/models/aion-labs.aion-2-0/)
- [Reflection: Beam 1.0 501B A23B](https://singitai.app/models/beam-1.0-501b-a23b/)
- [Claude Fable 5](https://singitai.app/models/claude-fable-5/)
- [Claude Fable 5.1](https://singitai.app/models/claude-fable-5.1/)
- [Claude Haiku 4.5](https://singitai.app/models/claude-haiku-4.5/)
- [Claude Haiku 5.5](https://singitai.app/models/claude-haiku-5.5/)
- [Claude Opus 4.8 Fast](https://singitai.app/models/claude-opus-4-8-fast/)
- [Claude Opus 4.5](https://singitai.app/models/claude-opus-4.5/)
- [Claude Opus 4.6](https://singitai.app/models/claude-opus-4.6/)
- [Claude Opus 4.7](https://singitai.app/models/claude-opus-4.7/)
- [Claude Opus 4.8](https://singitai.app/models/claude-opus-4.8/)
- [Claude Opus 5](https://singitai.app/models/claude-opus-5/)
- [Claude Opus 5 (Fast)](https://singitai.app/models/claude-opus-5-fast/)
- [Claude Opus 5.5](https://singitai.app/models/claude-opus-5.5/)
- [Claude Sonnet 4.5](https://singitai.app/models/claude-sonnet-4.5/)
- [Claude Sonnet 4.6](https://singitai.app/models/claude-sonnet-4.6/)
- [Claude Sonnet 5](https://singitai.app/models/claude-sonnet-5/)
- [Claude Sonnet 5.5](https://singitai.app/models/claude-sonnet-5.5/)
- [Cohere: Command A+](https://singitai.app/models/command-a-plus/)
- [DeepSeek R1](https://singitai.app/models/deepseek-r1/)
- [DeepSeek V3.1](https://singitai.app/models/deepseek-v3.1/)
- [DeepSeek V3.2](https://singitai.app/models/deepseek-v3.2/)
- [DeepSeek V4 Flash](https://singitai.app/models/deepseek-v4-flash/)
- [DeepSeek V4 Flash 0731](https://singitai.app/models/deepseek-v4-flash-0731/)
- [DeepSeek V4 Flash 0731 Fast](https://singitai.app/models/deepseek-v4-flash-0731-fast/)
- [DeepSeek: DeepSeek V4 Flash Vision Exp](https://singitai.app/models/deepseek-v4-flash-vision-exp/)
- [DeepSeek V4 Pro](https://singitai.app/models/deepseek-v4-pro/)
- [DeepSeek V4 Pro 0813](https://singitai.app/models/deepseek-v4-pro-0813/)
- [DeepSeek V4.1 Flash](https://singitai.app/models/deepseek-v4.1-flash/)
- [DeepSeek V4.1 Flash 1017](https://singitai.app/models/deepseek-v4.1-flash-1017/)
- [Devstral 2 123B](https://singitai.app/models/devstral-2-123b/)
- [DeepSeek V4 Flash E2EE](https://singitai.app/models/e2ee-deepseek-v4-flash/)
- [Gemma 3 27B E2EE](https://singitai.app/models/e2ee-gemma-3-27b/)
- [Gemma 4 26B A4B Uncensored (E2EE)](https://singitai.app/models/e2ee-gemma-4-26b-a4b-uncensored-p/)
- [Gemma 4 31B (E2EE)](https://singitai.app/models/e2ee-gemma-4-31b/)
- [GLM 5.2 E2EE](https://singitai.app/models/e2ee-glm-5-2-p/)
- [GLM 5.1 E2EE](https://singitai.app/models/e2ee-glm-5.1/)
- [GPT OSS 120B](https://singitai.app/models/e2ee-gpt-oss-120b-p/)
- [GPT OSS 20B](https://singitai.app/models/e2ee-gpt-oss-20b-p/)
- [Qwen 2.5 7B](https://singitai.app/models/e2ee-qwen-2-5-7b-p/)
- [Qwen 3.6 35B A3B (E2EE)](https://singitai.app/models/e2ee-qwen3-6-35b-a3b/)
- [Qwen 3.6 35B A3B Uncensored (E2EE)](https://singitai.app/models/e2ee-qwen3-6-35b-a3b-uncensored-p/)
- [Fireworks: Ember-1](https://singitai.app/models/ember-1/)
- [Gemini 2.5 Flash](https://singitai.app/models/gemini-2.5-flash/)
- [Gemini 2.5 Pro](https://singitai.app/models/gemini-2.5-pro/)
- [Gemini 3.5 Flash](https://singitai.app/models/gemini-3-5-flash/)
- [Gemini 3.5 Flash Lite](https://singitai.app/models/gemini-3-5-flash-lite/)
- [Gemini 3.6 Flash](https://singitai.app/models/gemini-3-6-flash/)
- [Gemini 3 Flash Preview](https://singitai.app/models/gemini-3-flash-preview/)
- [Gemini 3.1 Flash Lite](https://singitai.app/models/gemini-3.1-flash-lite/)
- [Gemini 3.1 Pro](https://singitai.app/models/gemini-3.1-pro/)
- [Gemini 3.1 Pro Preview](https://singitai.app/models/gemini-3.1-pro-preview/)
- [Gemini 3.7 Flash](https://singitai.app/models/gemini-3.7-flash/)
- [Gemini 3.8 Flash](https://singitai.app/models/gemini-3.8-flash/)
- [Google: Gemini 4 Argon](https://singitai.app/models/gemini-4-argon/)
- [Gemma 3 12B IT](https://singitai.app/models/gemma-3-12b-it/)
- [Gemma 3 27B](https://singitai.app/models/gemma-3-27b-it/)
- [Gemma 3 4B IT](https://singitai.app/models/gemma-3-4b-it/)
- [Gemma 4 26B A4B IT](https://singitai.app/models/gemma-4-26b-a4b-it/)
- [Gemma 4 31B](https://singitai.app/models/gemma-4-31b/)
- [Gemma 4 31B IT](https://singitai.app/models/gemma-4-31b-it/)
- [Gemma 4 E2B](https://singitai.app/models/gemma-4-e2b/)
- [Gemma 4 Uncensored](https://singitai.app/models/gemma-4-uncensored/)
- [Elorian: Glimpse](https://singitai.app/models/glimpse/)
- [GLM 4.5](https://singitai.app/models/glm-4.5/)
- [GLM 4.5 Air](https://singitai.app/models/glm-4.5-air/)
- [GLM 4.6](https://singitai.app/models/glm-4.6/)
- [GLM 4.7](https://singitai.app/models/glm-4.7/)
- [GLM 4.7 Flash](https://singitai.app/models/glm-4.7-flash/)
- [GLM 4.7 Flash Heretic](https://singitai.app/models/glm-4.7-flash-heretic/)
- [GLM 5](https://singitai.app/models/glm-5/)
- [GLM-5 Turbo](https://singitai.app/models/glm-5-turbo/)
- [GLM 5.1](https://singitai.app/models/glm-5.1/)
- [GLM 5.2](https://singitai.app/models/glm-5.2/)
- [GLM 5.3](https://singitai.app/models/glm-5.3/)
- [GLM 5.3 Flash](https://singitai.app/models/glm-5.3-flash/)
- [Z.ai: GLM 5.3 FlashX](https://singitai.app/models/glm-5.3-flashx/)
- [Z.ai: GLM 5.3 Prime](https://singitai.app/models/glm-5.3-prime/)
- [GLM 5V Turbo](https://singitai.app/models/glm-5v-turbo/)
- [GPT-4o](https://singitai.app/models/gpt-4o/)
- [GPT-4o Mini](https://singitai.app/models/gpt-4o-mini/)
- [GPT 5 Mini](https://singitai.app/models/gpt-5-mini/)
- [GPT 5 Nano](https://singitai.app/models/gpt-5-nano/)
- [GPT-5.2](https://singitai.app/models/gpt-5.2/)
- [GPT-5.2 Codex](https://singitai.app/models/gpt-5.2-codex/)
- [GPT-5.3 Codex](https://singitai.app/models/gpt-5.3-codex/)
- [GPT-5.4](https://singitai.app/models/gpt-5.4/)
- [GPT-5.4 Mini](https://singitai.app/models/gpt-5.4-mini/)
- [GPT 5.4 Nano](https://singitai.app/models/gpt-5.4-nano/)
- [GPT-5.4 Pro](https://singitai.app/models/gpt-5.4-pro/)
- [GPT-5.5](https://singitai.app/models/gpt-5.5/)
- [GPT-5.5 Pro](https://singitai.app/models/gpt-5.5-pro/)
- [GPT-5.6 Luna](https://singitai.app/models/gpt-5.6-luna/)
- [GPT-5.6 Luna Pro](https://singitai.app/models/gpt-5.6-luna-pro/)
- [GPT-5.6 Sol](https://singitai.app/models/gpt-5.6-sol/)
- [GPT-5.6 Sol Pro](https://singitai.app/models/gpt-5.6-sol-pro/)
- [GPT-5.6 Terra](https://singitai.app/models/gpt-5.6-terra/)
- [GPT-5.6 Terra Pro](https://singitai.app/models/gpt-5.6-terra-pro/)
- [GPT-6 Astra](https://singitai.app/models/gpt-6-astra/)
- [GPT-6 Luna](https://singitai.app/models/gpt-6-luna/)
- [GPT-6 Luna Pro](https://singitai.app/models/gpt-6-luna-pro/)
- [GPT-6 Sol](https://singitai.app/models/gpt-6-sol/)
- [GPT-6 Sol Pro](https://singitai.app/models/gpt-6-sol-pro/)
- [GPT-6.1 Sol](https://singitai.app/models/gpt-6.1-sol/)
- [OpenAI: GPT-6.1 Sol Pro](https://singitai.app/models/gpt-6.1-sol-pro/)
- [OpenAI: GPT-6.1 Terra](https://singitai.app/models/gpt-6.1-terra/)
- [OpenAI: GPT-6.1 Terra Pro](https://singitai.app/models/gpt-6.1-terra-pro/)
- [Grok 4.20 Beta](https://singitai.app/models/grok-4.20-beta/)
- [Grok 4.20 Multi-Agent Beta](https://singitai.app/models/grok-4.20-multi-agent-beta/)
- [Grok 4.3](https://singitai.app/models/grok-4.3/)
- [Grok 4.5](https://singitai.app/models/grok-4.5/)
- [Grok 4.6](https://singitai.app/models/grok-4.6/)
- [Grok 4.7](https://singitai.app/models/grok-4.7/)
- [Grok Build 0.1](https://singitai.app/models/grok-build-0-1/)
- [Hermes 3 Llama 3.1 405b](https://singitai.app/models/hermes-3-llama-3.1-405b/)
- [Tencent HY3](https://singitai.app/models/hy3/)
- [Kimi K2](https://singitai.app/models/kimi-k2/)
- [Kimi K2 Thinking](https://singitai.app/models/kimi-k2-thinking/)
- [Kimi K2.5](https://singitai.app/models/kimi-k2.5/)
- [Kimi K2.6](https://singitai.app/models/kimi-k2.6/)
- [Kimi K2.7 Code](https://singitai.app/models/kimi-k2.7-code/)
- [Kimi K3](https://singitai.app/models/kimi-k3/)
- [Kimi K3 Fast](https://singitai.app/models/kimi-k3-fast-api/)
- [Kimi K3.1 Pro](https://singitai.app/models/kimi-k3.1-pro/)
- [LiquidAI: LFM2.5-24B-A2B](https://singitai.app/models/lfm-2.5-24b-a2b/)
- [inclusionAI: Ling 3.1 Flash](https://singitai.app/models/ling-3.1-flash/)
- [Llama 3.2 3B](https://singitai.app/models/llama-3.2-3b-instruct/)
- [Llama 3.3 70B](https://singitai.app/models/llama-3.3-70b-instruct/)
- [Magistral Small 2509](https://singitai.app/models/magistral-small-2509/)
- [Mercury 2](https://singitai.app/models/mercury-2/)
- [Inception: Mercury 2.5](https://singitai.app/models/mercury-2.5/)
- [Mercury 3](https://singitai.app/models/mercury-3/)
- [MiMo-V2.5-Pro](https://singitai.app/models/mimo-v2.5-pro/)
- [MiMo-V2.6-Flash](https://singitai.app/models/mimo-v2.6-flash/)
- [MiMo-V2.6-Pro](https://singitai.app/models/mimo-v2.6-pro/)
- [MiMo-V2.6-Pro-UltraSpeed](https://singitai.app/models/mimo-v2.6-pro-ultraspeed/)
- [MiniMax M2](https://singitai.app/models/minimax-m2/)
- [MiniMax M2.1](https://singitai.app/models/minimax-m2.1/)
- [MiniMax M2.5](https://singitai.app/models/minimax-m2.5/)
- [MiniMax M2.7](https://singitai.app/models/minimax-m2.7/)
- [MiniMax M2.7 Highspeed](https://singitai.app/models/minimax-m2.7-highspeed/)
- [MiniMax M3](https://singitai.app/models/minimax-m3/)
- [MiniMax M3 Preview](https://singitai.app/models/minimax-m3-preview/)
- [Ministral 14B 3.0](https://singitai.app/models/ministral-3-14b-instruct/)
- [Ministral 3B](https://singitai.app/models/ministral-3-3b-instruct/)
- [Ministral 3 8B](https://singitai.app/models/ministral-3-8b-instruct/)
- [Venice Medium](https://singitai.app/models/mistral-large/)
- [Mistral Large 3](https://singitai.app/models/mistral-large-3/)
- [Mistral: Mistral Large 4](https://singitai.app/models/mistral-large-4-0/)
- [Mistral Small 3.2 24B Instruct](https://singitai.app/models/mistral-small-3.2-24b-instruct/)
- [Mistral Small 4](https://singitai.app/models/mistral-small-4/)
- [Moondream: Moondream 3 Preview](https://singitai.app/models/moondream3-preview/)
- [Moondream: Moondream 3.1](https://singitai.app/models/moondream3.1-9b-a2b/)
- [Meta: Muse Glimmer 30B](https://singitai.app/models/muse-glimmer-30b/)
- [Meta: Muse Spark 1.1](https://singitai.app/models/muse-spark-1.1/)
- [Meta: Muse Spark 1.2](https://singitai.app/models/muse-spark-1.2/)
- [Meta: Muse Spark 1.2 Contributor](https://singitai.app/models/muse-spark-1.2-contributor/)
- [Meta: Muse Spark 1.3](https://singitai.app/models/muse-spark-1.3/)
- [Meta: Muse Spark 1.3 Contributor](https://singitai.app/models/muse-spark-1.3-contributor/)
- [Meta: Muse Spark Open](https://singitai.app/models/muse-spark-open/)
- [Meta: Muse Wonder](https://singitai.app/models/muse-wonder/)
- [NVIDIA: Nemotron 3.5 Super VL](https://singitai.app/models/nemotron-3.5-super-vl/)
- [NVIDIA Nemotron 3 Nano 30B](https://singitai.app/models/nvidia-nemotron-3-nano-30b-a3b/)
- [NVIDIA Nemotron 3 Super 120B](https://singitai.app/models/nvidia-nemotron-3-super-120b/)
- [NVIDIA Nemotron 3 Ultra 550B](https://singitai.app/models/nvidia-nemotron-3-ultra-550b-a55b/)
- [NVIDIA Nemotron Nano 12B v2 VL BF16](https://singitai.app/models/nvidia-nemotron-nano-12b-v2/)
- [NVIDIA Nemotron Nano 9B v2](https://singitai.app/models/nvidia-nemotron-nano-9b-v2/)
- [OpenAI GPT OSS 120B](https://singitai.app/models/openai-gpt-oss-120b/)
- [gpt-oss-20b](https://singitai.app/models/openai-gpt-oss-20b/)
- [GPT OSS Safeguard 120B](https://singitai.app/models/openai-gpt-oss-safeguard-120b/)
- [GPT OSS Safeguard 20B](https://singitai.app/models/openai-gpt-oss-safeguard-20b/)
- [Palmyra Vision 7B](https://singitai.app/models/palmyra-vision-7b/)
- [Pareto 26.9](https://singitai.app/models/pareto-26.9/)
- [Particle AI: Particle-1](https://singitai.app/models/particle-1/)
- [Qwen 3.7 Max](https://singitai.app/models/qwen-3-7-max/)
- [Qwen 3.7 Plus](https://singitai.app/models/qwen-3-7-plus/)
- [Qwen 3.8 27B](https://singitai.app/models/qwen-3-8-27b/)
- [Qwen 3 235B A22B Instruct 2507](https://singitai.app/models/qwen3-235b-a22b-2507/)
- [Qwen 3 235B A22B Thinking 2507](https://singitai.app/models/qwen3-235b-a22b-thinking-2507/)
- [Qwen3 30B A3B](https://singitai.app/models/qwen3-30b-a3b/)
- [Qwen3 32B](https://singitai.app/models/qwen3-32b/)
- [Qwen 3.5 35B A3B](https://singitai.app/models/qwen3-5-35b-a3b/)
- [Qwen 3.5 9B](https://singitai.app/models/qwen3-5-9b/)
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- [Qwen3 Coder 30B A3B Instruct](https://singitai.app/models/qwen3-coder-30b-a3b-instruct/)
- [Qwen3 Coder Next](https://singitai.app/models/qwen3-coder-next/)
- [Qwen 3 Coder 480B Turbo](https://singitai.app/models/qwen3-coder-turbo/)
- [Qwen 3 Next 80b](https://singitai.app/models/qwen3-next-80b-a3b-instruct/)
- [Qwen3 VL 235B A22B](https://singitai.app/models/qwen3-vl-235b-a22b-instruct/)
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- [Qwen3 VL 30B A3B](https://singitai.app/models/qwen3-vl-30b-a3b-thinking/)
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- [Qwen3.5 Flash](https://singitai.app/models/qwen3.5-flash/)
- [Qwen3.5 Plus](https://singitai.app/models/qwen3.5-plus/)
- [Qwen 3.6 27B](https://singitai.app/models/qwen3.6-27b/)
- [Qwen 3.6 Plus Uncensored](https://singitai.app/models/qwen3.6-plus-uncensored/)
- [Qwen: Qwen3.7 Flash](https://singitai.app/models/qwen3.7-flash/)
- [Qwen3.8 2.4T A95B](https://singitai.app/models/qwen3.8-2.4t-a95b/)
- [Qwen3.8 Flash](https://singitai.app/models/qwen3.8-flash/)
- [Qwen: Qwen3.8 Max (0902)](https://singitai.app/models/qwen3.8-max-0902/)
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- [Qwen: Qwen3.8 Omni Flash](https://singitai.app/models/qwen3.8-omni-flash/)
- [Seed 2.1 Turbo](https://singitai.app/models/seed-2-1-turbo/)
- [ByteDance Seed: Seed-2.0-Code](https://singitai.app/models/seed-2.0-code/)
- [Venice Uncensored 1.2](https://singitai.app/models/venice-uncensored-1.2/)
- [Venice Role Play Uncensored](https://singitai.app/models/venice-uncensored-role-play/)
- [MiMo-V2.5](https://singitai.app/models/xiaomi-mimo-v2-5/)
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