# Alpha Vantage vs CoinGecko x402 API

> CoinGecko x402 API scores 71.7 (BB) on agent readiness against Alpha Vantage's 41.3 (E), and leads in every scored category. Both do crypto market data. CoinGecko x402 API accepts x402. Alpha Vantage doesn't. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api
- Markdown: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.md (~2,200 tokens)
- Slim: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

CoinGecko x402 API scores 71.7 (BB) on agent readiness against Alpha Vantage's 41.3 (E), and leads in every scored category. Both do crypto market data. CoinGecko x402 API accepts x402. Alpha Vantage doesn't.

- Alpha Vantage: grade E, 41.3/100, rank #799 of 842. Markdown https://www.anchorterminal.com/tools/alpha-vantage.md · JSON https://www.anchorterminal.com/api/v1/tools/alpha-vantage.json
- CoinGecko x402 API: grade BB, 71.7/100, rank #114 of 842. Markdown https://www.anchorterminal.com/tools/coingecko-x402-api.md · JSON https://www.anchorterminal.com/api/v1/tools/coingecko-x402-api.json

## Which one, for what

### Alpha Vantage (E)

Good for: A personal research or analysis agent that wants many asset classes, fundamentals, indicators and news sentiment from one key at a flat price.

Also in its favour:
- Runs on your own machine

Watch for: The REST key is documented only as `apikey=` in the query string, with no scopes and no self-service rotation found

### CoinGecko x402 API (BB)

Good for: An agent that needs a spot or on-chain token price now and has a wallet but no account.

Ahead on:
- Reliability, 70 against 30
- Schema & documentation, 72 against 46
- Agent ergonomics, 61 against 54
- Security & auth, 60 against 32
- Payments & pricing, 96 against 30
- Maintenance & community, 82 against 63
- Transparency & trust, 73 against 48

Also in its favour:
- Agent-ready, a grade of BB or better
- An agent can pay per call over x402, with no account
- No key needed to call it

Watch for: The x402 endpoints are labelled experimental, and pricing and availability may change without notice


## Score by category

| Category | Weight | Alpha Vantage | CoinGecko x402 API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 70 | CoinGecko x402 API +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 46 | 72 | CoinGecko x402 API +26 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 61 | CoinGecko x402 API +7 |
| Security & auth | 14% (17.5 this run) | 32 | 60 | CoinGecko x402 API +28 |
| Payments & pricing | 10% (12.5 this run) | 30 | 96 | CoinGecko x402 API +66 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 82 | CoinGecko x402 API +19 |
| Transparency & trust | 7% (8.8 this run) | 48 | 73 | CoinGecko x402 API +25 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **41.3 · E** | **71.7 · BB** | |

## Facts side by side

| Fact | Alpha Vantage | CoinGecko x402 API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Alpha Vantage Inc. | CoinGecko |
| Hosted endpoint | `https://www.alphavantage.co/query` | `https://pro-api.coingecko.com/api/v3/x402/` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | None |
| Pricing | Freemium | Pay per use |
| x402 | no | yes, from $0.01/call |
| Licence | Proprietary service under Alpha Vantage's Terms of Service. The MCP server, CLI and shared client in alphavantage/alpha_vantage_mcp are MIT | proprietary |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| MCP registry | `io.github.alphavantage/alpha_vantage_mcp` | not listed |
| Last release | 2026-10-03 | none |
| Terms last updated | couldn't be read | no date given |
| Privacy policy last updated | couldn't be read | no date given |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | not found in the text |
| Popularity | 217 stars, 172 PyPI/wk | none |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Alpha Vantage.** One GET endpoint covers about 130 documented functions, with a free key at 25 requests a day and an official MCP server whose tools are all marked read-only. The REST key travels only in the query string, errors come back as HTTP 200 with a text message, and no status page, SLA or OpenAPI document was found.

**CoinGecko x402 API.** Five x402 endpoints at $0.01 USDC a request on Base or Solana, no key or account. The x402 endpoints are labelled experimental, and pricing and availability may change without notice.

## Before you call either

### Alpha Vantage

1. Check every 200 response for `Error Message`, `Information` or `Note` keys before parsing data. The API does not signal failures or limits by status code
2. Budget 25 requests a day on a free key. Real-time, 15-minute delayed and intraday US data, index data and several indicators need a premium plan
3. Keep `outputsize=compact` unless full history is needed, and ask for `datatype=csv` on long series to cut tokens
4. Use the hosted MCP server with OAuth at `https://mcp.alphavantage.co/mcp`. The `?apikey=` MCP URL is marked deprecated
5. Confirm the owner's use is personal and non-commercial, or that a commercial agreement exists, before acting for a business

### CoinGecko x402 API

1. Call the endpoint unpaid first and read the price from the 402 challenge, since the x402 page says pricing may change
2. Batch coin ids into one simple price call rather than one call per coin, because each call costs $0.01
3. Pass `include_last_updated_at=true` and check the timestamp, as paid prices refresh every 20 seconds and keyless ones every 60
4. Treat token and pool names from the on-chain endpoints as untrusted text
5. Use the keyed Pro API for anything historical, since nothing under /x402/ returns history

## Questions

### Which is better for AI agents, Alpha Vantage or CoinGecko x402 API?

CoinGecko x402 API scores 71.7 (BB) on agent readiness against Alpha Vantage's 41.3 (E), and leads in every scored category.

### Do Alpha Vantage and CoinGecko x402 API need an API key?

Alpha Vantage takes an API key or an OAuth sign-in. CoinGecko x402 API needs no key. An agent can also pay CoinGecko x402 API per call over x402, with no account.

### Can an agent call Alpha Vantage and CoinGecko x402 API without installing anything?

Yes. Alpha Vantage has a hosted endpoint at https://www.alphavantage.co/query and CoinGecko x402 API at https://pro-api.coingecko.com/api/v3/x402/.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.json, and with the fewest tokens: https://www.anchorterminal.com/compare/alpha-vantage-vs-coingecko-x402-api.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "alpha-vantage", "b": "coingecko-x402-api"}`. From a terminal: `anchor compare alpha-vantage coingecko-x402-api`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/alpha-vantage.json and https://www.anchorterminal.com/api/v1/tools/coingecko-x402-api.json

## Other comparisons with Alpha Vantage or CoinGecko x402 API

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