Best of · Everyday APIs
Best shopping and order APIs for AI agents buying for a person
All 5 ranked shopping and order APIs for AI agents buying for a person on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.
- 5 ranked
- 0 agent-ready
- 5 hosted endpoints
- Updated 14 October 2026
Top three
Picks by need
Worked out from the scores, prices and facts, so they change when the research does.
Schema & documentation
Instacart Developer Platform API + MCP D
80/100 on schema & documentation, against 75 for the overall leader.
Agent ergonomics
85/100 on agent ergonomics, against 64 for the overall leader.
The shortlist
| # | Tool | Grade | Best for | Price | Where |
|---|---|---|---|---|---|
| 1 | Etsy Open API v3 Etsy, Inc. |
B 63.4 | Product discovery and price comparison across Etsy's handmade and vintage listings. | Free | Hosted |
| 2 | Amazon Creators API Amazon.com Services LLC |
D 48.7 | Product search, price checks and affiliate links for an agent that recommends Amazon products and hands the purchase to the person. | Free | Hosted |
| 3 | Instacart Developer Platform API + MCP Maplebear Inc. (Instacart) |
D 48.3 | Grocery list and recipe hand-off for meal planning and recipe agents in the US and Canada. | Free | Hosted |
| 4 | Best Buy Developer API BestBuy.com, LLC (Best Buy Co., Inc.) |
E 39.1 | Product, price and store-availability search for US electronics, for agents that compare and then hand the purchase to the person. | Free | Hosted |
| 5 | Walmart Affiliate Marketing API Wal-Mart.com USA, LLC (Walmart Inc.) |
E 38.6 | Product search and affiliate links for an agent recommending Walmart products and handing the purchase to the person. | Free | Hosted |
How to choose
- Search only or order tooCheck whether the API can place an order or only returns products and links, since an agent that cannot check out has to hand the purchase back to the person.
- Terms on automated buyersRead what the retailer's terms say about bots and automated purchases, because an account can be closed for buying through an unapproved agent.
- Returns and refund statusCheck whether return requests and refund status are available through the API, so an agent can follow a return without the person logging in.
- Partner or affiliate approvalCheck whether access needs an affiliate account, sales history or partner approval, as these can block a new developer for weeks.
How the benchmark tests this category. In this run, public evidence against the published checklist. When the task suites run, the same product searched on each listing, an order placed where a sandbox allows, then tracked and returned. We check search results and prices, the order and return steps, refund status and the terms on automated access.
Each one in detail
Etsy Open API v3
B 63.4/100Etsy's Open API v3 is a REST API for the Etsy marketplace. Any approved app can search active listings across all shops with an API key, while OAuth covers seller shop, listing and order management.
Verdict Public OpenAPI 3.0 contract and keyed listing search across all Etsy shops, with price, keyword, category and location filters and documented 429 handling. It is search only. No cart, checkout, buyer order or return endpoints exist, so a person buys on etsy.com, and cross-shop use needs a reviewed Personal App.
Best for Product discovery and price comparison across Etsy's handmade and vintage listings.
Strengths
- Public OpenAPI 3.0.2 contract at www.etsy.com/openapi/generated/oas/3.0.0.json with 105 operations, 104 marked General Release
- findAllListingsActive searches all active listings by keyword, price range, taxonomy, shop location and buyer country, up to 100 per page
- Rate limits per key with remaining-call headers, and 429 responses carry retry-after
Weaknesses
- No cart, checkout, buyer order, return or refund endpoints. Order data is the seller's receipts, behind OAuth
- Cross-shop apps need a Personal App, which goes through a review with no published timeline
- Error bodies are a single text field with no machine-readable code
Price FreeAuth OAuth or keyx402 NoHosted
Amazon Creators API
D 48.7/100Amazon's product catalogue API for Amazon Associates affiliates, replacing Product Advertising API 5.0. It searches and looks up products, prices and variations across 22 Amazon stores and returns tagged affiliate links. It cannot place orders.
Verdict Read-only product search and lookup across 22 Amazon stores, with field selection, typed error reasons and documented rate limits. It cannot place or follow orders, so a person buys through the affiliate link. Access needs an accepted Associates account with 10 qualifying sales in 30 days, and the Agent Terms require agents to identify themselves.
Best for Product search, price checks and affiliate links for an agent that recommends Amazon products and hands the purchase to the person.
Strengths
- The resources parameter returns only the requested fields, and GetItems takes up to 10 ASINs per call
- Errors carry a type, a machine-readable reason code and, where relevant, retryAfterSeconds
- Rate limits are published with numbers, starting at 1 request a second and 8,640 a day
Weaknesses
- No order, cart, checkout, order status or return operation
- Access needs 10 qualifying sales in the trailing 30 days and lapses without them
- No public OpenAPI description, llms.txt or status page was found
Price FreeAuth OAuthx402 NoHosted
Instacart Developer Platform API + MCP
D 48.3/100The Instacart Developer Platform API and its hosted MCP server turn a recipe or shopping list into an Instacart Marketplace page, where the person picks a store and checks out. It also finds nearby retailers by postal code.
Verdict Two compact MCP tools and a small REST API with structured errors let an agent turn a list into an Instacart cart link. The agent cannot search products, see prices, place an order or follow one, and production keys need a demo review that Instacart puts at 30 to 40 days. No status page or published rate figure was found.
Best for Grocery list and recipe hand-off for meal planning and recipe agents in the US and Canada.
Strengths
- Hosted MCP server at https://mcp.instacart.com/mcp with two tools, create-recipe and create-shopping-list, each with typed JSON Schema inputs
- Errors return an HTTP code, an internal error code and a meta key naming the field, with per-endpoint error tables
- Separate development and production hosts and keys, with key rotation and revocation documented
Weaknesses
- No product search, price, order, order status or return endpoint. The person picks the store and checks out on Instacart
- Production keys need a screen-recorded demo and review, and Instacart puts access request to production at about 30 to 40 days
- No status page and no rate limit figure, only a 429 with advice to retry later
Price FreeAuth API keyx402 NoHosted
Best Buy Developer API
E 39.1/100Best Buy's Developer API gives read access to the BESTBUY.COM catalogue, prices, availability, categories, US stores, recommendations and open-box listings with a free API key. Ordering through the Commerce API is invite-only for partners.
Verdict A free key with published limits of 5 calls a second and 50,000 a day opens catalogue, price and store-availability search, with field selection and cursor paging. Ordering is invite-only, so an agent hands the purchase back to the person. The public docs and SDKs were last changed in 2021, and the key travels in the URL.
Best for Product, price and store-availability search for US electronics, for agents that compare and then hand the purchase to the person.
Strengths
- Free API key with published limits of 5 calls a second and 50,000 calls a day for Products, Stores, Categories, Recommendations and Buying Options
- The show parameter returns only named fields, and pageSize reaches 100 with cursorMark for walking large result sets
- Search syntax with comparison operators, AND and OR, wildcards, facets and sorting over more than a million current and historical products
Weaknesses
- Ordering, fulfilment, order lookup and cancellation are only in the Commerce API, which is invite-only with documentation shared after approval
- The API key is sent as the apiKey query parameter, so it appears in URLs and logs
- The public documentation repository was last changed on 26 April 2021 and the JavaScript SDK 2.4.1 dates from February 2021
Price FreeAuth API keyx402 NoHosted
Walmart Affiliate Marketing API
E 38.6/100Walmart's read-only catalogue API for affiliates, documented on the Walmart I/O portal. It searches Walmart.com products and returns item details, reviews, taxonomy, trending items, recommendations and nearby stores, with affiliate links tracked through Impact. It cannot place orders.
Verdict Live, free catalogue search and product lookup for approved Walmart affiliates, signed with an RSA key and capped at 5,000 calls a day. It cannot place or follow orders, and the Checkout API needs separate approval. The documentation renders only in a browser, and the API terms date from 2020 and still name a previous affiliate network.
Best for Product search and affiliate links for an agent recommending Walmart products and handing the purchase to the person.
Strengths
- Read-only search, lookup by item ID or UPC, reviews, taxonomy, trending items and store lookup in one API
- Request signing with an RSA private key that is never sent, and signatures that expire after 180 seconds
- Separate sandbox and production consumer IDs
Weaknesses
- No order, cart, order status or return operation in the affiliate API
- The documentation is rendered by browser script, with no OpenAPI, llms.txt or Markdown
- The API terms were last updated on 30 September 2020 and name Rakuten LinkShare, not Impact
Price FreeAuth API keyx402 NoHosted
Head to head
- Amazon Creators API vs Etsy Open API v3 D 48.7 vs B 63.4
- Best Buy Developer API vs Etsy Open API v3 E 39.1 vs B 63.4
- Etsy Open API v3 vs Walmart Affiliate Marketing API B 63.4 vs E 38.6
- Amazon Creators API vs Instacart Developer Platform API + MCP D 48.7 vs D 48.3
- Amazon Creators API vs Best Buy Developer API D 48.7 vs E 39.1
- Amazon Creators API vs Walmart Affiliate Marketing API D 48.7 vs E 38.6
- Instacart Developer Platform API + MCP vs Walmart Affiliate Marketing API D 48.3 vs E 38.6
- Best Buy Developer API vs Walmart Affiliate Marketing API E 39.1 vs E 38.6
Questions
What are the highest-rated shopping and order APIs for AI agents buying for a person for AI agents?
Etsy Open API v3 has the highest benchmark score of the 5 ranked shopping and order APIs for AI agents buying for a person, 63.4 (B). Amazon Creators API is second with 48.7 (D).
How many shopping and order APIs for AI agents buying for a person are agent-ready?
0 of the 5 ranked here grade BB or better, the bar for agent-ready on the Anchor benchmark.
Which shopping and order APIs for AI agents buying for a person accept x402 payments?
None of the ranked listings here accepts x402 for its main call yet.
How is this list ranked?
By the Anchor benchmark score out of 100, a weighted mean of the scored categories minus deductions for negative events, from public evidence re-checked as vendors change. Listings cannot pay for a place. The latest assessment behind this page is from 14 October 2026.
How this list is made
The order is the Anchor benchmark score, the same number as on each listing and in the top list. Each listing is graded from public evidence against the benchmark checklist, and the picks above are worked out from those grades, prices and facts. No listing pays for its place, and paid audits or listing help never change a score.
Full ranked table · 8 head-to-head comparisons · Best tools in every category